Added boot sector and I/O system
Added the reconstructed source code of the boot sector and I/O system (DOS BIOS).
This commit is contained in:
Broken Pipe
@@ -0,0 +1,148 @@
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;This is a disk boot routine for the 1771/1791 type disk
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;controllers. It would normally reside on track 0,
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;sector 1, to be loaded by the "B" command of the
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;monitor at address 200H. By changing the equates
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;below, it may be configured to load any size of
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;program at any address. The program is assumed to
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;occupy consecutive sectors starting at track 0, sector
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;2, and will begin exection at its load address (which
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;must be a 16-byte boundary) with the Instruction
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;Pointer set to zero.
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; Variations are available for the Cromemco 4FDC with
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; large disks, the 4FDC with small disks, the Tarbell
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; single-density controller, and the Tarbell double-
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; density controller. Select one.
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CROMEMCOSMALL: EQU 0
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CROMEMCOLARGE: EQU 1
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TARBELLSINGLE: EQU 0
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TARBELLDOUBLE: EQU 0
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LOAD: EQU 400H ;Address to load program
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SEG: EQU 40H ;LOAD/10H
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SECTOR: EQU 51 ;No. of 128-byte sectors to load
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BOOTER: EQU 200H ;"B" command puts booter here
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;**************************************************************
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CROMEMCO: EQU CROMEMCOLARGE+CROMEMCOSMALL
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TARBELL: EQU TARBELLSINGLE+TARBELLDOUBLE
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WD1771: EQU CROMEMCO+TARBELLSINGLE
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WD1791: EQU TARBELLDOUBLE
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SMALL: EQU CROMEMCOSMALL
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LARGE: EQU CROMEMCOLARGE+TARBELL
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IF SMALL
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MAXSECT:EQU 18
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ENDIF
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IF LARGE
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MAXSECT:EQU 26
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ENDIF
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IF TARBELL
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DISK: EQU 78H
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ENDIF
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IF CROMEMCO
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DISK: EQU 30H
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ENDIF
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IF WD1771
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READCOM:EQU 88H
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ENDIF
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IF WD1791
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READCOM:EQU 80H
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ENDIF
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IF CROMEMCOLARGE
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WAITBYTE:EQU 0B1H
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ENDIF
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IF CROMEMCOSMALL
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WAITBYTE:EQU 0A1H
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ENDIF
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ORG BOOTER
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PUT 100H
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XOR AX,AX
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MOV DS,AX
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MOV ES,AX
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MOV SS,AX
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UP
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MOV DI,LOAD
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MOV DX,SECTOR
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MOV BL,2
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SECT:
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MOV AL,BL
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OUTB DISK+2
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MOV CX,128
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INB DISK+4
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TEST AL,20H
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MOV AL,READCOM
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JNZ OUTCOM
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MOV AL,READCOM+4
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OUTCOM:
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OUTB DISK
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IF CROMEMCO
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MOV AL,WAITBYTE
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OUT DISK+4 ;Turn on hardware wait
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ENDIF
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READ:
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INB DISK+4
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IF TARBELL
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ROL AL
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JNC DONE
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ENDIF
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IF CROMEMCO
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ROR AL
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JC DONE
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ENDIF
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INB DISK+3
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STOB
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LOOP READ
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GETSTAT:
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INB DISK+4
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IF TARBELL
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ROL AL
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JC GETSTAT
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ENDIF
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IF CROMEMCO
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ROR AL
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JNC GETSTAT
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ENDIF
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DONE:
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IN DISK
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AND AL,9CH
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JNZ SECT
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DEC DX
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JZ BOOT
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INC BL
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CMP BL,MAXSECT+1
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JNZ SECT
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XOR BL,BL
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INC DX
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MOV AL,58H ;Step in with update
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OUTB DISK
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JP GETSTAT
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BOOT:
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MOV AX,SEG
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MOV SS,AX
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MOV ES,AX
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MOV DS,AX
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JMP 0,SEG
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@@ -0,0 +1,605 @@
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; I/O System for 86-DOS.
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; Assumes a CPU Support card at F0 hex for character I/O,
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; with disk drivers for Tarbell or Cromemco controllers.
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; Select disk controller here
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TARBELL:EQU 0
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CROMEMCO:EQU 1
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; For either disk controller, a custom drive table may be defined
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CUSTOM: EQU 0
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; If Tarbell disk controller, select one-sided or two-sided drives
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; and single or double density controller
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DOUB1SIDE:EQU 0
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DOUB2SIDE:EQU 0
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SNGL1SIDE:EQU 0
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; If Cromemco disk controller, select drive configuration
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SMALLCRO:EQU 0 ;3 small drives
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COMBCRO:EQU 1 ;2 large drives and 1 small one
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LARGECRO:EQU 0 ;4 large drives
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WD1791: EQU DOUB1SIDE+DOUB2SIDE
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WD1771: EQU CROMEMCO+SNGL1SIDE
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IF WD1791
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READCOM:EQU 80H
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WRITECOM:EQU 0A0H
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ENDIF
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IF WD1771
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READCOM:EQU 88H
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WRITECOM:EQU 0A8H
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ENDIF
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IF TARBELL
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DONEBIT:EQU 80H
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DISK: EQU 78H
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ENDIF
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IF CROMEMCO
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DONEBIT:EQU 1
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DISK: EQU 30H
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ENDIF
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DOSSEG: EQU 80H
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ORG 0
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PUT 100H
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BASE: EQU 0F0H
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STAT: EQU BASE+7
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DAV: EQU 2
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TBMT: EQU 1
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DATA: EQU BASE+6
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PSTAT: EQU BASE+0DH
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PDATA: EQU BASE+0CH
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JMP INIT
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JMP STATUS
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JMP INP
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JMP OUTP
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JMP PRINT
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JMP AUXIN
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JMP AUXOUT
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JMP READ
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JMP WRITE
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JMP RETL ;Flush buffers
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INIT:
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MOV AX,CS
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MOV DS,AX
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MOV SS,AX
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MOV SP,STACK
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MOV SI,INITTAB
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CALL 0,DOSSEG
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MOV DX,100H
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MOV AH,26 ;Set DMA address
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INT 21H
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MOV BX,DS
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MOV AX,CS
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MOV DS,AX
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MOV DX,FCB
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MOV AH,15
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INT 21H
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OR AL,AL
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JNZ COMERR
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MOV [FCB+33],0
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MOV CX,200H
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MOV AH,39 ;Load file
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INT 21H
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JCXZ COMERR
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CMP AL,1
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JNZ COMERR
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MOV DS,BX
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MOV ES,BX
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MOV SS,BX
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MOV SP,40H
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XOR AX,AX
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PUSH AX
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MOV DX,80H
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MOV AH,26
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INT 21H
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PUSH BX
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MOV AX,100H
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PUSH AX
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RET L
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COMERR:
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MOV DX,BADCOM
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MOV AH,9 ;Print string
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INT 21H
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EI
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STALL: JP STALL
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BADCOM: DB 13,10,"Bad or missing Command Interpreter",13,10,"$"
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FCB: DB 1,"COMMAND COM"
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DS 24
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STATUS:
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IN STAT
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AND AL,DAV
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RET L
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AUXIN:
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INP:
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IN STAT
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AND AL,DAV
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JZ INP
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IN DATA
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AND AL,7FH
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RET L
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AUXOUT:
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OUTP:
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PUSH AX
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OUTLP:
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IN STAT
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AND AL,TBMT
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JZ OUTLP
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POP AX
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OUT DATA
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RET L
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PRINT:
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PUSH AX
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PRINLP:
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IN PSTAT
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AND AL,TBMT
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JZ PRINLP
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POP AX
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OUT PDATA
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RET L
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READ:
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CALL SEEK
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RDLP:
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PUSH CX
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CALL READSECT
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POP CX
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JC ERROR
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INC DH
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ADD SI,128
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LOOP RDLP
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OR AL,AL
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RETL: RET L
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WRITE:
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CALL SEEK
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WRTLP:
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PUSH CX
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CALL WRITESECT
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POP CX
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JC ERROR
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INC DH
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ADD SI,128
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LOOP WRTLP
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OR AL,AL
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RET L
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ERROR:
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SEG CS
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MOV B,[DI],-1
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RET L
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SEEK:
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; Inputs:
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; AL = Drive number
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; BX = Disk transfer address in DS
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; CX = Number of sectors to transfer
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; DX = Logical record number of transfer
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; Function:
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; Seeks to proper track.
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; Outputs:
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; AH = Drive select byte
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; DL = Track number
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; DH = Sector number
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; SI = Disk transfer address in DS
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; DI = pointer to drive's track counter in CS
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; CX unchanged.
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MOV SI,BX ; Save transfer address
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CBW
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MOV BX,AX ; Prepare to index on drive number
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SEG CS
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MOV AL,[BX+DRVTAB]
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OUT DISK+4 ; Select drive
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IF CROMEMCO
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OR AL,80H ;Set auto-wait bit
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ENDIF
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MOV AH,AL ;Save for later
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XCHG AX,DX
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MOV DL,26 ;26 sectors per track
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IF CROMEMCO
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TEST DH,10H ;Check if small disk
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JNZ BIGONE
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MOV DL,18 ;18 sectors on small disk track
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BIGONE:
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ENDIF
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DIV AL,DL ;Compute track and sector
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XCHG AX,DX
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INC DH ;First sector is 1, not zero
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SEG CS
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MOV BL,[BX+TRKPT] ;Get this drive's displacement into track table
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ADD BX,TRKTAB ;BX now points to track counter for this drive
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MOV DI,BX
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MOV AL,DL
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SEG CS
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XCHG AL,[DI] ;Xchange current track with desired track
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OUT DISK+1 ;Inform controller chip of current track
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CMP AL,DL
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JZ ONTRK
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MOV BH,3 ;Seek retry count
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CMP AL,-1 ;Head position known?
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JNZ NOHOME ;If not, home head
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TRYSK:
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CALL HOME
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NOHOME:
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MOV AL,DL
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OUT DISK+3
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MOV AL,1CH
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CALL MOVHEAD
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AND AL,98H
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JZ ONTRK
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DEC BH
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JNZ TRYSK
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STC
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ONTRK:
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RET
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SETUP:
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IF CROMEMCO
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TEST AH,10H ;Check for small disk
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JNZ CHKSTP
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CMP DH,18 ;Only 18 sectors/track on small ones
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JA STEP
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CHKSTP:
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ENDIF
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CMP DH,26 ;Check for overflow onto next track
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JBE PUTSEC
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STEP:
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INC DL
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MOV DH,1
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MOV AL,58H ;Step in with update, no verify
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CALL DCOM
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SEG CS
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INC B,[DI] ;Update track counter
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PUTSEC:
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MOV AL,DH
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OUT DISK+2
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MOV CX,80H
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IF TARBELL
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INB DISK ;Get head load bit
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ENDIF
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IF CROMEMCO
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INB DISK+4 ;Get head load bit
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XCHG AL,AH
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OUTB DISK+4 ;Turn on auto-wait
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XCHG AL,AH
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ENDIF
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NOT AL
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AND AL,20H ;Check head load status
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JZ CHKDRV
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MOV AL,4
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CHKDRV:
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; Turn on 15ms head load delay if selecting a different drive
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SEG CS
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CMP AH,[CURDRV]
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SEG CS
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MOV [CURDRV],AH
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JZ RET
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OR AL,4
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RET
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READSECT:
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CALL SETUP
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JC RET
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MOV BL,10
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RDAGN:
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OR AL,READCOM
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OUT DISK
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PUSH SI
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RLOOP:
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IN DISK+4
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TEST AL,DONEBIT
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IF TARBELL
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JZ RDONE
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ENDIF
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IF CROMEMCO
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JNZ RDONE
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ENDIF
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IN DISK+3
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MOV [SI],AL
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INC SI
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LOOP RLOOP
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RDONE:
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POP SI
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CALL GETSTAT
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AND AL,9CH
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JZ RET
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MOV AL,0
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DEC BL
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JNZ RDAGN
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STC
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RET
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WRITESECT:
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CALL SETUP
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JC RET
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MOV BL,10
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WRTAGN:
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OR AL,WRITECOM
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OUT DISK
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PUSH SI
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WRLOOP:
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IN DISK+4
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TEST AL,DONEBIT
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IF TARBELL
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JZ WRDONE
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ENDIF
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IF CROMEMCO
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JNZ WRDONE
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ENDIF
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LODB
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OUT DISK+3
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LOOP WRLOOP
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WRDONE:
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POP SI
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CALL GETSTAT
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AND AL,09CH
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JZ RET
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MOV AL,0
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DEC BL
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JNZ WRTAGN
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STC
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RET
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HOME:
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IF CROMEMCO
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TEST AH,10H ;Check seek speed bit
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JNZ RESTORE
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ENDIF
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MOV BL,3
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TRYHOM:
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MOV AL,0CH
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CALL DCOM
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AND AL,98H
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JZ RET
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MOV AL,58H ;Step in with update
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CALL DCOM
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DEC BL
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JNZ TRYHOM
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RET
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MOVHEAD:
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IF CROMEMCO
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TEST AH,10H ;Check seek speed bit
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JNZ FASTSK
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ENDIF
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||||
|
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DCOM:
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OUT DISK
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MOV AL,50
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DELAY:
|
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DEC AL ;Delay 10 microseconds
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JNZ DELAY
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GETSTAT:
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IN DISK+4
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TEST AL,DONEBIT
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IF TARBELL
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JNZ GETSTAT
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ENDIF
|
||||
|
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IF CROMEMCO
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JZ GETSTAT
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ENDIF
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IN DISK
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RET
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IF CROMEMCO
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RESTORE:
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MOV AL,0C4H ;READ ADDRESS command to keep head loaded
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OUT DISK
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MOV AL,77H
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OUT 4
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||||
CHKRES:
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IN 4
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AND AL,40H
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JZ RESDONE
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IN DISK+4
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TEST AL,DONEBIT
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JZ CHKRES
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IN DISK
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JP RESTORE ;Reload head
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RESDONE:
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MOV AL,7FH
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OUT 4
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||||
CALL GETSTAT
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||||
MOV AL,0
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||||
OUT DISK+1 ;Tell 1771 we're now on track 0
|
||||
RET
|
||||
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||||
FASTSK:
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||||
MOV AL,6FH
|
||||
OUT 4
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MOV AL,18H
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CALL DCOM
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SKWAIT:
|
||||
IN 4
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||||
TEST AL,40H
|
||||
JNZ SKWAIT
|
||||
MOV AL,7FH
|
||||
OUT 4
|
||||
MOV AL,0
|
||||
RET
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||||
ENDIF
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||||
|
||||
DS 20H
|
||||
STACK:
|
||||
|
||||
LFAT: EQU 300H
|
||||
SFAT: EQU 200H
|
||||
|
||||
CURDRV: DS 1
|
||||
|
||||
LDRIVE:
|
||||
DB 1 ;Records/sector
|
||||
DB 4 ;Records/cluster
|
||||
DW 52 ;Reserved records
|
||||
DB 6 ;FAT size (records)
|
||||
DB 2 ;Number of FATs
|
||||
DB 8 ;Number of directory records
|
||||
DW 482 ;Number of clusters on drive
|
||||
|
||||
SDRIVE:
|
||||
DB 1
|
||||
DB 2
|
||||
DW 54
|
||||
DB 4
|
||||
DB 2
|
||||
DB 8
|
||||
DW 330
|
||||
|
||||
IF DOUB1SIDE
|
||||
DRVTAB: DB 0,10H,20H,30H
|
||||
TRKPT: DB 0,1,2,3
|
||||
TRKTAB: DB -1,-1,-1,-1
|
||||
ENDIF
|
||||
|
||||
IF DOUB2SIDE
|
||||
DRVTAB: DB 0,40H,10H,50H
|
||||
TRKPT: DB 0,0,1,1
|
||||
TRKTAB: DB -1,-1
|
||||
ENDIF
|
||||
|
||||
IF SNGL1SIDE
|
||||
DRVTAB: DB 0F2H,0E2H,0D2H,0C0H
|
||||
TRKPT: DB 0,1,2,3
|
||||
TRKTAB: DB -1,-1,-1,-1
|
||||
ENDIF
|
||||
|
||||
IF TARBELL
|
||||
INITTAB:DB 4 ;Number of drives
|
||||
DW LDRIVE
|
||||
DW FAT0
|
||||
DW LDRIVE
|
||||
DW FAT1
|
||||
DW LDRIVE
|
||||
DW FAT2
|
||||
DW LDRIVE
|
||||
DW FAT3
|
||||
|
||||
ORG 0
|
||||
FAT0: DS LFAT
|
||||
FAT1: DS LFAT
|
||||
FAT2: DS LFAT
|
||||
FAT3: DS LFAT
|
||||
ENDIF
|
||||
|
||||
; Cromemco drive select byte is derived as follows:
|
||||
; Bit 7 = 0
|
||||
; Bit 6 = 1 if fast seek (PerSci)
|
||||
; Bit 5 = 1 (motor on)
|
||||
; Bit 4 = 0 for 5", 1 for 8" drives
|
||||
; Bit 3 = 1 for drive 3
|
||||
; Bit 2 = 1 for drive 2
|
||||
; Bit 1 = 1 for drive 1
|
||||
; Bit 0 = 1 for drive 0
|
||||
|
||||
IF LARGECRO
|
||||
; Table for four large drives
|
||||
DRVTAB: DB 31H,32H,34H,38H
|
||||
TRKPT: DB 0,0,1,1
|
||||
TRKTAB: DB -1,-1
|
||||
INITTAB:DB 4 ;Number of drives
|
||||
DW LDRIVE
|
||||
DW FAT0
|
||||
DW LDRIVE
|
||||
DW FAT1
|
||||
DW LDRIVE
|
||||
DW FAT2
|
||||
DW LDRIVE
|
||||
DW FAT3
|
||||
|
||||
ORG 0
|
||||
FAT0: DS LFAT
|
||||
FAT1: DS LFAT
|
||||
FAT2: DS LFAT
|
||||
FAT3: DS LFAT
|
||||
ENDIF
|
||||
|
||||
IF COMBCRO
|
||||
; Table for two large drives and one small one
|
||||
DRVTAB: DB 31H,32H,24H
|
||||
TRKPT: DB 0,0,1
|
||||
TRKTAB: DB -1,-1
|
||||
INITTAB:DB 3 ;Number of drives
|
||||
DW LDRIVE
|
||||
DW FAT0
|
||||
DW LDRIVE
|
||||
DW FAT1
|
||||
DW SDRIVE
|
||||
DW FAT2
|
||||
|
||||
ORG 0
|
||||
FAT0: DS LFAT
|
||||
FAT1: DS LFAT
|
||||
FAT2: DS SFAT
|
||||
ENDIF
|
||||
|
||||
IF SMALLCRO
|
||||
; Table for 3 small drives
|
||||
DRVTAB: DB 21H,22H,24H
|
||||
TRKPT: DB 0,1,2
|
||||
TRKTAB: DB -1,-1,-1
|
||||
INITTAB:DB 3
|
||||
DW SDRIVE
|
||||
DW FAT0
|
||||
DW SDRIVE
|
||||
DW FAT1
|
||||
DW SDRIVE
|
||||
DW FAT2
|
||||
|
||||
ORG 0
|
||||
FAT0: DS SFAT
|
||||
FAT1: DS SFAT
|
||||
FAT2: DS SFAT
|
||||
ENDIF
|
||||
|
||||
IF CUSTOM
|
||||
; Table for 2 large drives without fast seek
|
||||
DRVTAB: DB 31H,32H
|
||||
TRKPT: DB 0,1
|
||||
TRKTAB: DB -1,-1
|
||||
|
||||
INITTAB:DB 2
|
||||
DW LDRIVE
|
||||
DW FAT0
|
||||
DW LDRIVE
|
||||
DW FAT1
|
||||
|
||||
ORG 0
|
||||
FAT0: DS LFAT
|
||||
FAT1: DS LFAT
|
||||
ENDIF
|
||||
|
||||
Reference in New Issue
Block a user