359 lines
5.1 KiB
ArmAsm
359 lines
5.1 KiB
ArmAsm
"** 01-s1.pdf page 21
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" s4
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alloc: 0
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-1
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tad s.nfblks
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spa
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jmp 1f
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dac s.nfblks
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tad fblksp
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jms laci
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dac 9f+t
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jms copyz; dskbuf; 64
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lac 9f+t
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jms dskwr
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dzm .savblk
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lac 9f+t
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jmp alloc i
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1:
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lac s.nxfblk
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sna
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jms halt " OUT OF DISK
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dac s.fblks
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jms dskrd
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lac dskbuf
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dac s.nxfblk
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jms copy; dskbuf+1; s.fblks+1; 9
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lac d10
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dac s.nfblks
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jmp alloc+1
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free: 0
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lmq
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lac s.nfblks
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sad d10
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jmp 1f
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tad fblksp
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dac 9f+t
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lacq
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dac 9f+t i
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dzm .savblk
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isz s.nfblks
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jmp free i
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1:
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lac s.nxfblk
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dac dskbuf
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jms copy; s.fblks+1; dskbuf+1; 9
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lacq
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dac s.nxfblk
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jms dskwr
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dzm .savblk
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lac d1
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dac s.nfblks
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jmp free i
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t = t+1
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laci: 0
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and o17777
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tad o200000
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dac .+1
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lac ..
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jmp laci i
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"** 01-s1.pdf page 22
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" skip if AC between two values (inclusive)
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" jms betwen; low_ptr; high_ptr
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" <not between>
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" <between>
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" listing has an alternate written in
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" (which would require 'lac ptr' instead of 'ptr' args?)
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betwen: 0
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lmq cmq " get ~AC in MQ
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lac betwen i " get low_ptr
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dac 9f+t
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isz betwen " skip low_ptr
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lacq " get ~AC (-AC-1) from MQ
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tad 9f+t i " get low-AC-1
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sma " negative (AC >= low)?
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jmp 1f " no, return w/o skip
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lac betwen i " fetch high_ptr
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dac 9f+t
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isz betwen " skip high_ptr
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lacq " get -AC-1
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tad 9f+t i " add to high value (high-AC-1)
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cma " complement (AC-high)
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spa sna " AC-high <= 0?
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1:
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isz betwen " no: give happy return
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lacq " restore ~AC
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cma " restore AC
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jmp betwen i " return w/o skip
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copy: 0
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-1
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tad copy i
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dac 8
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isz copy
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-1
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tad copy i
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dac 9
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isz copy
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-1
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tad copy i
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cma
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dac 9f+t
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isz copy
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1:
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lac 8 i
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dac 9 i
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isz 9f+t
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jmp 1b
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jmp copy i
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copyz: 0
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-1
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tad copyz i
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dac 8
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isz copyz
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-1
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tad copyz i
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cma
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dac 9f+t
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isz copyz
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1:
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dzm 8 i
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isz 9f+t
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jmp 1b
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jmp copyz i
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t = t+1
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putchar: 0
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"** 01-s1.pdf page 23
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dac 9f+t
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cla
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jms takeq
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jmp putchar i
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tad o40001
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dac .+4
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lac 9f+t
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jms putq
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lac char
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dac q2+1 ..
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isz putchar
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jmp putchar i
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t = t+1
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getchar: 0
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jms takeq
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jmp i getchar
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tad o200001
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dac .+3
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cla
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jms putq
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lac q2+1 ..
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isz getchar
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jmp i getchar
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takeq: 0
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rcl
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tad lacq1
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dac .+7
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tad o640000
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dac .+17
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tad d1
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dac .+14
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tad o500000
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dac .+5
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lac q1 ..
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sna
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jmp takeq i
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dac lnkaddr
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sad q1+1 ..
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jmp .+5
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tad o200000
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dac .+1
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lac q2 ..
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jmp .+3
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cla
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dac q1+1 ..
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dac q1 ..
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isz takeq
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lac lnkaddr
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jmp i takeq
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putq: 0
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rcl
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tad dacq1
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dac .+14
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tad d1
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dac .+13
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tad o140000
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dac .+1
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lac q1-1 ..
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"** 01-s1.pdf page 24
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sna
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jmp .+6
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tad o40000
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dac .+2
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lac lnkaddr
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dac q2 ..
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jmp .+3
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lac lnkaddr
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dac q1 ..
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dac q1+1 ..
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jmp putq i
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srcdbs: 0
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dac 9f+t+2 "* lmq
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-ndskbs
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dac 9f+t
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law dskbs "* -1 dac 8 written
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dac 9f+t+1 "* lacq
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1:
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lac 9f+t+2 "** crossed out
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sad 9f+t+1 "** isz 8 written
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jmp srcdbs i
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law 65 "** ??? crossed out
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tad 9f+t+1 "** crossed out isz 8 written
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isz 9f+t+1
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isz 9f+t
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jmp 1b
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isz srcdbs
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jmp srcdbs i
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collapse: 0
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cla
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jms srcdbs
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jmp 1f
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law dskbs
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dac 9f+t+1 "** 9f+t+1 crossed out: 8 written in
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1:
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lac 9f+t+1 "** 9f+t+1 crossed out: 8 written in
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dac 0f+1
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tad d65 "** crossed out: d2-- original obscured
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dac 0f
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cma
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tad d1
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tad edskbsp
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and o17777
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sna
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jmp 0f+3
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dac 0f+2
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jms copy; 0:..; ..; ..
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-65
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tad edskbsp
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dac 9f+t
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tad d1
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dac 0f
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lac dskaddr
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dac 9f+t i
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jms copy; dskbuf; 0:..; 64
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jmp collapse i
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dskrd: 0
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jms betwen; d2; d7999
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"** 01-s1.pdf page 25
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jms halt
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sad dskaddr
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jmp dskrd i
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dac dskaddr
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jms srcdbs
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jmp 1f
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lac dskaddr
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jms dskio; 06000
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jmp 2f
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1:
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dzm 9f+t+1 i
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law 1
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tad 9f+t+1
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dac .+2
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jms copy; ..; dskbuf; 64
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2:
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jms collapse
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jmp dskrd i
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dskwr: 0
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jms betwen; d2; d7999
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jms halt
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jms dskio; 07000
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lac dskaddr
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jms srcdbs
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dzm 9f+t+1 i
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jms collapse
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jmp dskwr i
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t = t+3
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" called with:
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" AC/ block
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" jms dskio; dsld_bits
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dskio: 0
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dac dskaddr
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cll; idiv; 80
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dac 9f+t
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lacq
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idiv; 10
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dac 9f+t+1
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lls 22
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xor 9f+t+1
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als 8
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dac 9f+t+1
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lac 9f+t
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idiv; 10
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dac 9f+t
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lls 22
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xor 9f+t
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xor 9f+t+1
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xor o200000
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dac 9f+t
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jms dsktrans; -64; dskbuf; 9f+t; dskio
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isz dskio
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jmp dskio i
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t = t+1
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" called with:
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" jms dsktrans; -WC; MAC; addr_ptr?; dsld_ptr
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dsktrans: 0
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-10
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dac 9f+t
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1:
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-1
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tad dsktrans
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dac 12
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"** 01-s1.pdf page 26
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dscs " clear status register
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lac 12 i
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dslw " load WC
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lac 12 i
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dslm " load MAC
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lac 12 i
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jms laci
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dsld " load TA & SA
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dzm .dskb
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lac 12 i
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jms laci
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jms laci
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dsls " load status
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lac .dskb " check for interrupt
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sna
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jmp .-2
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lac .dske " get status from interrupt
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sma
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jmp 12 i " return
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isz 9f+t
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jmp 1b
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jms halt " 10 disk errors
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t = t+1
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halt: 0
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isz 9f+t
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jmp .-1
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iof
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hlt
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jms copy; law; 4096; 4096
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hlt; jmp .-1
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t = t+1
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