rename project

README.md

@@ -1,5 +1,5 @@
-# pon-gs
-Apple IIgs simple pong game, with animation and sound. Written in 100% 658c16 assembly.
+# mrbuffer
+Apple IIgs simple lowres buffer text editor. Written in 65816 assembly. The commit history will show a different name; I had originally intended to write a pong game but found editing text a more suitable vehicle for learning the quirks of writing code for the GS. 
 
 ## Getting Started
 

src/main.S

@@ -28,6 +28,8 @@
 ; show the current char on screen
 ; read keyboard then hit strobe to reset
 
+*row         da    $0400
+
             ldx   #0
             ldal  $00C010
 
@@ -52,7 +54,14 @@ keydown     nop
 
 up          nop
             jmp   rtsout
-down        nop
+down        clc
+            cpx   #1488
+            beq   rtsout
+            pha
+            txa
+            adc   #128
+            tax
+            pla
             jmp   rtsout
 
 left        clc
@@ -68,6 +77,7 @@ right       clc
             jmp   rtsout
 
 dispchar    stal  $000400,X
+            inx
             jmp   rtsout
 
 rtsout      ldal  $00C010
@@ -227,6 +237,25 @@ brkboi      brk
 
 
 
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