Merge pull request #58 from philbudne/master

fix init, build dsksav/dskres, have shell wake init before exit

build/Makefile

@@ -79,8 +79,8 @@ dirs:
 
 # The commands that came from the original scans
 cmd: dirs $(BINDIR)/as $(BINDIR)/cat $(BINDIR)/check $(BINDIR)/chmod \
-	$(BINDIR)/chown $(BINDIR)/chrm $(BINDIR)/cp $(BINDIR)/ds $(BINDIR)/ed \
+	$(BINDIR)/chown $(BINDIR)/chrm $(BINDIR)/cp $(BINDIR)/ds \
-	$(BINDIR)/init
+	$(BINDIR)/dskres $(BINDIR)/dsksav $(BINDIR)/ed $(BINDIR)/init
 
 # Alternate commands: no dd, but . and ..
 altcmd: dirs $(BINDIR)/as $(BINDIR)/cat $(BINDIR)/check $(BINDIR)/chmod \
@@ -114,6 +114,12 @@ $(BINDIR)/cp: $(CMDSRC)/cp.s
 $(BINDIR)/ds: $(CMDSRC)/ds.s
 	$(AS) $(ASARGS) -o $(BINDIR)/ds $(CMDSRC)/ds.s
 
+$(BINDIR)/dskres: $(CMDSRC)/dskres.s $(CMDSRC)/dskio.s $(SYSSRC)/sop.s
+	$(AS) $(ASARGS) -o $(BINDIR)/dskres $(CMDSRC)/dskres.s $(CMDSRC)/dskio.s $(SYSSRC)/sop.s
+
+$(BINDIR)/dsksav: $(CMDSRC)/dsksav.s $(CMDSRC)/dskio.s $(SYSSRC)/sop.s
+	$(AS) $(ASARGS) -o $(BINDIR)/dsksav $(CMDSRC)/dsksav.s $(CMDSRC)/dskio.s $(SYSSRC)/sop.s
+
 $(BINDIR)/ed: $(CMDSRC)/ed1.s $(CMDSRC)/ed2.s
 	$(AS) $(ASARGS) -o $(BINDIR)/ed $(CMDSRC)/ed1.s $(CMDSRC)/ed2.s
 

build/proto

@@ -27,6 +27,8 @@ dd 	         drwr- -1 4
         cp       frwr- -1 bin/cp
         date     frwr- -1 bin/date
         ds       frwr- -1 bin/ds
+        dskres   frwr- -1 bin/dskres
+        dsksav   frwr- -1 bin/dsksav
         ed       frwr- -1 bin/ed
 	init     frwr- -1 bin/init
         ln       frwr- -1 bin/ln

src/cmd/dskio.s

@@ -27,7 +27,7 @@ dskwr1: 0
    jmp i dskwr1
 
 
-iskio: 0
+dskio: 0
    cll; idiv; 80
    dac 2f
    lacq

src/cmd/ed1.s

@@ -100,7 +100,7 @@ ca:
 ca1:
    jms rline
    lac line
-   sad o56012
+   sad o56012		" . NL?
    jmp advanc
    jms append
    jmp ca1

src/cmd/init.s

@@ -4,16 +4,16 @@
    sys intrp
    jms init1			" Fork the first child connected to ttyin/ttyout
    jms init2			" Fork the second child connected to keyboard/display
-1:
+l:
    sys rmes			" Wait for a child to exit
    sad pid1
      jmp 1f			" It was child 1, so jump to 1f and restart it
    sad pid2
      jms init2			" It was child 2, so restart it
-   jmp 1			" and loop back. XXX: weird use of 1: not 1b. I don't like it!
+   jmp l			" and loop back.
 1:
    jms init1
-   jmp 1			" Weird use of 1: not 1b. I don't like it!
+   jmp l
 
 init1: 0
    sys fork			" Fork a child process

src/other/pbsh.s

@@ -332,7 +332,7 @@ rline: 0
 1:
    cla; sys read; char; 1 " Read in one character from stdin
    sna			" read ok?
-    sys exit		"  EOF: quit
+    jmp quit		" no
    lac char
    lrss 9		" Get it and shift down 9 bits
    sad o100		" '@' (kill) character?
@@ -353,6 +353,11 @@ rline: 0
    dac 8
    jmp 1b		" and loop back
 
+quit:
+   lac d1; sys smes	" wake up init
+   sys exit
+
+" copied from cat.s:
 putc: 0
    and o177			" Keep the lowest 7 bits and save into 2f+1
    dac 2f+1

src/sys/s3.s

@@ -283,11 +283,11 @@ rkbdi:
    lmq
    and o155
    sad o55
-   jmp 1f
+   jmp 1f			" -/=? map to =?-/ ???
    lacq
    and o137
    sad o134
-   skp
+   skp				" \| map to Ll ???
    jmp 2f
 1:
    lacq

src/sys/s7.s

@@ -77,18 +77,18 @@ cnop:			" fetched as constant in iread
 1: lds				" load display status (see 03-scope.pdf pg 25)
    sma ral			" display trap set? (and rotate left)
    jmp 1f			"  not set
-   cdf				" clear display flags
+   cdf				" display done executing; clear display flags
    lac .dspb
    sna
-   jmp piret
+   jmp piret			" return now if .dspb == 0
    tad dm3
    sna
-   jmp dsprestart
+   jmp dsprestart		" start display if .dspb == 3
-   dac .dspb
+   dac .dspb			" otherwise, .dspb -= 3 and return
    jmp piret
 dsprestart:
    lac d1
-   dac .dspb			" set .dsbp = 1
+   dac .dspb			" set .dspb = 1
    lac dspbufp			" load display buf pointer
    beg				" start display processor
    -10