If you enter PRINT PEEK(1) on real C64 hardware or on VICE right after boot-up then you will get 55 ($37) as a result. Also several online sources claim $37 as the correct default value. On MiSTer you get 247 ($F7), i.e. bits 6 and 7 are 1 instead of 0 after the KERNAL code (vanilla ROM) from $FDD5 to $FDDB has been executed.
My pull request suggests to fix this.
Disclaimer: Bits 6 and 7 of Zero Page address $01 are unused. So this is for sure not a big deal. I am not even sure if this fix here improves the compatibility for any game or demo. But I thought it might be interesting for accuracy and I am quite sure it is not having negative side effects.
P.S. Huge thank you @sorgelig and the whole MiSTer team for doing what you are doing. I am a contributor to the MiSTer2MEGA65 project which is a homage to your work.
If you enter
PRINT PEEK(1)on real C64 hardware or on VICE right after boot-up then you will get55($37) as a result. Also several online sources claim $37 as the correct default value. On MiSTer you get247($F7), i.e. bits 6 and 7 are1instead of0after the KERNAL code (vanilla ROM) from $FDD5 to $FDDB has been executed.My pull request suggests to fix this.
Disclaimer: Bits 6 and 7 of Zero Page address $01 are unused. So this is for sure not a big deal. I am not even sure if this fix here improves the compatibility for any game or demo. But I thought it might be interesting for accuracy and I am quite sure it is not having negative side effects.
P.S. Huge thank you @sorgelig and the whole MiSTer team for doing what you are doing. I am a contributor to the MiSTer2MEGA65 project which is a homage to your work.