Re: [cc65] c64 kernal 02 vs. 03

From: Ullrich von Bassewitz <>
Date: 2009-09-27 15:31:00
On Sat, Sep 26, 2009 at 05:44:50PM +0200, Groepaz wrote:
> it is... i'd say that maybe 20% of the c64s out there use the -O2 kernal. back
> in the days it was a popular sign of lameness when a crack didnt work on one
> or the other =P

Just found this, when browsing through the sources:

; Ullrich von Bassewitz, 2002-12-09
; PLOT replacement function for the VIC20. The kernal function does not set
; the pointer to the color RAM correctly.
        .export         PLOT

.proc   PLOT

        bcs     @L1
        jsr     $FFF0                   ; Set cursor position
        jmp     $EAB2                   ; Set pointer to color RAM
@L1:    jmp     $FFF0                   ; Get cursor position


So the VIC had the same problem as the C64 with the -02 kernal and it was
fixed in another way. Maybe I should apply the same to the C64?



Ullrich von Bassewitz                        
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Received on Sun Sep 27 15:32:49 2009

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