figure out how to modeset but still need to toggle to get full bank a for adding, unelegant perhaps?

2024-12-21 11:29:28 +00:00 · 2018-02-04 21:25:37 -05:00 · 2018-02-04 21:25:37 -05:00 · 85da0e6b65
commit 85da0e6b65
parent b8063ff72f
1 changed files with 30 additions and 3 deletions
--- a/src/main.S
+++ b/src/main.S
@ -5,7 +5,7 @@
 ; ensure 16-bit mode (unnecessary?)
            clc
            xce
-            rep   #$20
+            rep   #$30

            phk
            plb
@ -23,7 +23,8 @@
            ldal  $00C054     ; select text page 1 (there are 2)
            ldal  $00C056     ; select "low res" graphics

-*            rep   #$30
+            rep   #$30
+            sep   #$20

 ; show the current char on screen
 ; read keyboard then hit strobe to reset
@ -49,16 +50,27 @@ keydown     nop
            beq   right
            jmp   dispchar

-up          nop
+up          clc
+            cpx   #1488
+            beq   rtsout
+            rep   #$30
+            pha
+            txa
+            sbc   #128
+            tax
+            pla
+            sep   #$20
            jmp   rtsout
 down        clc
            cpx   #1488
            beq   rtsout
+            rep   #$30
            pha
            txa
            adc   #128
            tax
            pla
+            sep   #$20
            jmp   rtsout

 left        clc
@ -269,6 +281,21 @@ brkboi      brk



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