Please do. I haven't had opportunity to test the patch yet however, keep this in mind.

Thanks! I haven't tested yet, and knew I was missing something but wasn't sure what

Hey guys,

Sorry for waking a relatively old thread, but I was working with the 6502 badge and had challenges with the upper case requirements. Before finding this thread I had already written prototype code to fix this and it's a bit different from what I found here so I thought I'd share for ...

Awesome work! :D

I have one feature request. Could you add a BIOS function to poll input without waiting for a character? The only input function I noticed appears to wait indefinitely for input. Most firmwares I've seen just set carry and return zero if the input buffer is empty for calls like ...

For anyone unaware, the sd2iec firmware supports several c64 speed loaders. The source code (at sd2iec.de) is also available, making it feasible to set up a custom unit, even with the possibility of parallel transfers. One could also study the documentation in any of the speed loader source files ...

The WDC 65C02 also appears to handle a reset as a half-ass interrupt: during three of the six reset cycles, it appears to read from three decrementing(!) addresses in the stack area.

I suspect that handling all three signals (~IRQ, ~NMI and ~RESET) the same way (pushing the flags and PC onto the ...

GEOS for the c-64 runs very reasonably on the 65816 with very little modification: New drivers to switch the cpu to 1mhz during disk I/O. I suspect it doesn't use many, if any at all when it comes to undocumented instructions.

It wouldn't make sense to have a separate codebase from the apple2 ...

For the 65816, there's a (slim) possibility of resurrecting a long abandoned operating system for the commodore 64 + superCPU combination:

http://sourceforge.net/projects/wingsos/

You have the usual caveats of running an OS with no memory protection of course. One unexpected exception can bring ...

In systems with the HMOS SID, there's a zener diode that limits the voltage to the sound chip. 12v would be safe to inject before the regulator circuit built into the system.

In breadbin (rounder) c64's 9vac is also used for a separate 5v supply to the video IC. In flat/c64c versions, it's not 100% necessary, but you'll get no audio.