CCS64 Forum

Hello,

i tested an old program of mine with CCS and found a bug in the three extended colors mode:

I display a field with a different background, but it seems that the color information is not written at the position where the chars are, it seems to be two lines above. I assume that the pointer in $F3 still points to that line because there was the last text given out with bsout ($FFD2)

Tests with VICE show behaviour as expected on original Commodore 64.
(The code ist running on my original C64s aswell )

I can provide a small test program for showing the problem. Can i attach a C64 binary here?

Best regards
Andreas

Check the problem again with Revision 3 of the KERNAL.ROM file. If the problem still occurs, e-mail me the image file:
s[.]toomer[@]ntlworld[.]com
without the [] characters and I will pass it on to Hakan for investigation.

Ok. I just tested it with a rev 03 kernal and CCS is working fine!

Seems that my program runs on a problem in the rev 02 kernal. I don't correctly remember, but i have seen a site on the web where all the differences between the kernal revisions are listed. I will take a look there for seeing which call causes the problems and how i can avoid it.

Nevertheless i will send the test program to you, maybe you're interested.
Thanks for the help, i would not have taken a tought about that the problem might be caused by the kernal differences.

Andreas

Yes, there were some bugs in some routines in the earlier revisions of the C64 Kernal. CCS64 uses Revision 2 of the Kernal, but Revision 3 is best overall.

Is there a special reason for not including the latest kernal (rev.3) in the installation package of CCS64 v3.1?

Ciao,
Michael

No special reason, Hakan just hasn't had the time to update the packaged ROMs. He doesn't have much time for CCS64 bug-fixes/enhancements nowadays, so he makes a release whenever he can.