Bart van Leeuwen

So, the offending code seems to be this bit from roms/c64rom/kernal/uci.s just below the _my_chkout label: ; there is a pending CKOUT command, same SA? lda SECADDR cmp UCI_LAST_SA beq...

@markusC64 does this work for you? https://www.bartsplace.net/download/hskernal394.bin

> Unfortunately not. I am still receiving "cp1\ncd//os". So obviously two commands. Odd, will look at that later today when I'm back home. > Interestingly enough, just removing cmp and...

> Is it possible that you need to compare with #$6F instead of #$0F? A peek command from basic 2.0 of to the address makes me think that. Maybe, will...

I'm not sure a command is always followed by a \n. Consider the basic program in the initial report, that shouldn't have a \n between the commands I'd think.

> I already stood corrected by Markus. :-) > > Just the compare with 6F? Hmm... doesn't feel right. I think the issue should be solved in a more fundamentally...

> Oh, you're right... > > > I think the 'correct' way would be to also 'emulate' listen/unlisten I think. > > Well, in that case, you also need iecout...

> So it might be better not to patch listen/talk and unlisten/untalk. With Geos MP3 Kernal I/O Edition, you can test that behavior. It really switches to serial bus when...

> Indeed. IMHO it is more important to care about bottlenecks you find by benchmarking. E. g. reading "sequential" (*) files is really, really slow. Not only with hyperspeed, but...

Well, BlueREU certainly can work with the Ultimate II+L on a C128 (DCR). https://youtu.be/UPxIj67LNa4?si=KoWipxLvyaD6lSdk So the question is why it doesn't work for you. One thing to check is if...