X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;ds=sidebyside;f=ROM-2003%2Fvend.asm;h=0fb1161e26b5c6078fda24ad6c8776ee4eaf90b4;hb=71e8027de3a3694e5b763657dcd30e85ed5b85c0;hp=ee733c131691263c9df74dd99d439b51c103ab59;hpb=3ab9c6bfa526db3e2d5c9ac5bbbef0517b977364;p=uccvend-snackrom.git

diff --git a/ROM-2003/vend.asm b/ROM-2003/vend.asm
index ee733c1..0fb1161 100644
--- a/ROM-2003/vend.asm
+++ b/ROM-2003/vend.asm
@@ -143,6 +143,8 @@
 
 
 
+;0800 - 0x0fff memory bank 2k
+;
 ;1800  Internal switches
 ;   7 changer INT'
 ;   6 Sold out.
@@ -7942,7 +7944,7 @@ BDB4 39              9     rts
 
 jump78:
 ; start/finish sending a byte to the display
-; stack parameter - 0 to disable clock (finish), 1 to enable clock (start)
+; stack parameter - 0 to disable display clock (for reading keypad), 1 to enable
 ; lower 8-bits of D - byte to write to display.
 ; bytes with bit 7 unset are characters (0-127)
 ; bytes with bit 7 set are control commands.
@@ -8060,7 +8062,7 @@ BE6F BD E5 96        ...   jsr e596		;jump115 - 100ms delay
 BE72 CE 10 00        ...   ldx #1000
 BE75 1C 00 80        ..    bset 00,x, #80
 
-; set clock polarity
+; set SPI enable
 BE78 CE 10 28        ...   ldx #1028
 BE7B 1C 00 40        ...   bset 00,x, #40
 
@@ -8080,7 +8082,7 @@ BE90 CC 00 E0        ...   ldd #00e0    ;11100000
 BE93 BD BD B5        ...   jsr bdb5		;jump78
 BE96 38              8     pulx 
 
-; revert clock polarity
+; revert SPI enable
 BE97 CE 10 28        ..(   ldx #1028
 BE9A 1D 00 40        ...   bclr 00,x, #40
 BE9D 39              9     rts