Updated c128 accelerator code and documentation.

2018-04-21 09:52:50 -07:00
parent 3f5683b391
commit 28f26991ac
4 changed files with 76 additions and 74 deletions
--- a/libsrc/c64/acc_detect_c128.s
+++ b/libsrc/c64/acc_detect_c128.s
@@ -21,13 +21,16 @@ _detect_c128:

 ; Make sure the CPU is a 8502
        .byte   $1A                   ; NOP on 8502, INA on 65(S)C(E)02, 4510 and 65816
-        bne     not_found
+        beq     found
+        .byte   $3A                   ; decrement A again, so a #$00 can be returned
+        rts
+
+found:

 ; Make sure a C128 VICIIe is present
        ldy     C128_VICIIE_CLK
        cpy     #$FF
        beq     not_found
-found:
        lda     #$01
 not_found:
        rts