Made the CBM Pet kbrepeat() work on both 40-column and 80-column machines.

Put the kbrepeat() description in an alphabetical position in the function document.
2017-09-05 03:40:34 -04:00
parent 0deeccebf8
commit 3c0b8c4e86
3 changed files with 55 additions and 40 deletions
--- a/libsrc/pet/kbrepeat.s
+++ b/libsrc/pet/kbrepeat.s
@@ -1,14 +1,29 @@
 ;
 ; unsigned char __fastcall__ kbrepeat (unsigned char mode);
+;
+; 2017-06-16, Groepaz
+; 2017-09-05, Greg King
 ;

-        .export _kbrepeat
+        .export         _kbrepeat

        .include        "pet.inc"

 _kbrepeat:
-        ldx KBDREPEAT           ; get old value
-        sta KBDREPEAT           ; store new value
-        txa                     ; return old value
-        ldx #0
+        ldx     #>$0000
+        ldy     SCR_LINELEN
+        cpy     #40 + 1
+        bcc     L1              ; branch if screen is 40 columns wide
+
+        ldy     KBDREPEAT80     ; get old value
+        sta     KBDREPEAT80     ; store new value
+        tya                     ; return old value
+        rts
+
+L1:     tay
+        lda     KBDREPEAT40B    ; get REPEAT-key flag (used by some editor ROMs)
+        lsr     a               ; move bit 0 into bit 7
+        ror     a
+        ora     KBDREPEAT40     ; combine with old key-REPEAT flags
+        sty     KBDREPEAT40
        rts