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Yes, just in there for the first boot and check out. I have a couple of 1978 vintage NMOS CPUs. One will go in for the memory board tests. Once the memory board is worked out the Rockwell will go back in. As well, I will be replacing most of the LS logic with ABT, ACT and maybe HCT parts where I can...

Nice collection!

I am jealous!

Just waiting on the Cherry key switches.

Ready to go.

Hi Danny, I was working on that before life caught up to me. A few emergencies, vacations and household projects can sure throw a wrench into things like this. I'm not sure when I'll get back to it, but the result will be put up on Github. I do have a work copy that I got compiled with A65 or the Ko...

I said 6820, but meant 6850. It's the ACIA I am worried about. I suppose I could look around for a 68B50, but even they are only rated to 2mHz. Still, it would improve my chances of getting up to 4mHz.

What CPU are you gentlemen using and what max speed is possible ? I'm going to start with a 2mHz NMOS 6502A running it a 1mHz for my board memory test, but will switch to a Rokwell 65C02 rated a 4mHz. My RAM is 200ns and my EPROMs are 300ns. I should be able to do 2mHz easily and would even try 4, ...

Hi Grant, that link to digikey does not seem to be working.

Nice simple mod.

It'd be great if you could get the patch loaded. I wonder if that could be incorporated into a monitor ROM?

You could free up a bit of space in SYNMON by removing C2 and C4 specific code.

Wow, that's lot of modification!