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Zyron
Registered: Jan 2002
Posts: 2381 |
"Colour bug" on old c64 not emulated in Vice?
I remember that doing something like this
lda #col
sta $0286
jsr $e544
will work on a new c64, but on the old model $d800- would get the same colour as $d021 so no chars will be visible.
I've tried this in Vice v2.3 but no matter what setup I choose I can't reproduce the bug.
I've tested with Super Music since I remember clearly that it did not display any text on my old c64. |
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Zyron
Registered: Jan 2002
Posts: 2381 |
I remember we had a loader part in Lunacy 6 - The Lost Sequel where we told coders to instead do it this way:
lda #col
sta $d021
jsr $e536
which works. Or at least that's what it was supposed to say but I think Depeh messed it up in some way. :) |
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iAN CooG
Registered: May 2002
Posts: 3196 |
Quote: @Zyron: Thanks. Now I got it, finally. :)
But still one thing remains. Why don't i see the patched areas given in the vice.log file when I check from monitor? For example 3 bytes at $e42d looks like
20 1e ab
for both rev0 and rev3 kernals.
Is there any chance that i see rev3 from monitor even if it's patched at the background (doesn't make sense to me actually)? That was the main reason i got confused, since both ROMs looked similar at certain points from monitor.
these 3 bytes are infact patched for nothing when you patch from rev3 to rev0 but they change when you use other revisions for example -kernalrev 4064
The relevant code for the $0286 bug is
rev0
(C:$e458) d e4d2
.C:e4d2 AA TAX
.C:e4d3 AA TAX
.C:e4d4 AA TAX
.C:e4d5 AA TAX
.C:e4d6 AA TAX
.C:e4d7 AA TAX
.C:e4d8 AA TAX
.C:e4d9 AA TAX
.C:e4da AD 21 D0 LDA $D021 <- uses screen color
.C:e4dd 91 F3 STA ($F3),Y
rev3
.C:e4d2 AA TAX
.C:e4d3 85 A9 STA $A9
.C:e4d5 A9 01 LDA #$01
.C:e4d7 85 AB STA $AB
.C:e4d9 60 RTS
.C:e4da AD 86 02 LDA $0286 <- proper cursor color
.C:e4dd 91 F3 STA ($F3),Y
these dumps are taken from vice monitor after launching x64 with -kernalrev 0 and 3 (or nothing because 3 it's the default rom) |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
Quote:@Groepaz: My vice version is downloaded from viceteam.org and files are completely untouched.
you might want to get the latest one from http://vice-emu.sourceforge.net/ :=)
and what i wanted to say is: this option might disappear, as it is redundant. |
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Ninja
Registered: Jan 2002
Posts: 411 |
That's what I collected back then:
http://unusedino.de/ec64/technical/aay/c64/krnver.htm
Dunno where I got the revision numbering, though. |
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