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8284 pin 10 goes from high to low. So I see that chips are taken out of "reset state". The CPU pin 21 is low. The 8255 pin 35 is low. U21 pin 8 is...

So here's what's happened it the last few days with this laptop: It kept randomly shutting off on me, so I tried swapping several things out, none of...

I didn't get any shocks from any capacitors after I turned my system on to test. I think you should be fine. (Also, I believe your faulty capacitors...

Thank you! Both are marked 607-0187-A Also, they both have RAM cards (different kinds) and I get problems with and without the cards, so the...

Much the same way as the original DEC circuit I copied it from, with a diode...

I haven't grabbed one of my YE data drives off the shelf yet, but one thing to inspect is the nylon "cone" that's inserted into the hub and secures...

Retrohun did the boot into a game loaded via the cassette port almost 3 years ago. J.R. Bogin did it though a ROM design but nothing really precludes...

That sounds like a memory problem. Your symptom tells me a bit inside one of the memory chips is stuck at 0 (instead of switching between 0 and 1)....

Ye dang fools, ah was bootin' mah IBM PC offa telegraph befer ye's were in diapers! B.. but you're only 30 years ol-- SHADDAP!

I have the design. It was just that I don't have plans to make any more. It was just a one time shot to help spread the cost. As has been said, the...

LOL, yeah :-)

I'll add I also have an orchid ramquest, any idea how that would interact with the piggyback boards? I haven't tried it... it has a Xilinx hardwired...

I also have a RK05 exerciser. Will probably get to it sometime before christmas. Will be able to take pictures. /Mattis

While I am waiting on the first round of parts to arrive, I decided to look through the bag of 'stuff' that came with the computer. I knew a bag...

Or just “load”-ed one. I mean, yeah, you have BASIC, use it.

If you can't make an adapter, here's information on an alternative that is slightly easier to find than the 6300 branded mouse:...

Used a custom boot rom. I'd be more impressed if they'd keyed in a program in Cassette BASIC.

Hi Dave_M and Daver2, I have made several attempts to find something on the Vertical Sync pin, but, I am 99% sure it is just stuck at -5Volts with...

How does that handle power-down sequencing?

I'm just getting back to this project now. Did you have any luck?

Well, I suspect that the floppy disc version might be a possibility...

Now I see, thank you. I seem to suffer from some sort of "spare parts disease". I have to have spares of all the less common IC's in my vintage...

Waiting for the wire-recorder version...

I'm not upset, just confused. Thanks Mike