sys comments

2016-03-21 11:00:19 -04:00
parent eca41ba9dc
commit 164125be7e
2 changed files with 7 additions and 7 deletions
@@ -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
-   dac .dspb
+   jmp dsprestart		" start display if .dspb == 3
+   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