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I used the version of this board that has 2MB of SRAM: https://www.micro-nova.com/mercury-2 1. Add the chips and 50-pin connector to my Kaypro...

A number of Windows programs had shared DLLs and those shared DLLs need be in the Windows directory. Some Windows programs like Command Post modified...

Sounds like a generic "pitfall"-type game. (Not to be confused with the Activision platformer.) I remember even the Boy Scouts magazine had a type-in...

I somewhat disagree with you Next. These mid 90's macs have early SMD caps that ALL seem to leak. I have devices from the very early 70's with...

6100 boards all have bad leaky caps and the power supplies are actually far worse with extreme leakage and corroding traces. I went through my stack...

Thanks Dave, that is very helpful to see the exact document. I can make the interface from that. One of the problems I have quickly discovered for...

I think I've read enough of "The Source" to formulate a strategy from bring up TRSDOS (maybe I should refer it as LS-DOS instead?) on new hardware...

I suppose it is also worth pointing out that there are two (2) +5V regulators (and, therefore, two +5V rails) on the PET 2001N. Obviously, both dc...

have you considered 3 d printing them.... easy enough to make.

Ah OK. Missed that. If these were measured AT the DRAM sockets then fair enough. :)

The AIM-65 is supposed to interface to the serial world via a 20 mA current loop. However, with the addition of an RS232 transmitter buffer, it...

Post #28 should cover the rail voltages. Worth double-checking them though with an oscilloscope - looking for dc level and ripple/noise. That...

Iron wattage depends on what you're doing. For SMD work, a 40W iron can be sufficient, but for through hole stuff, a 60-80W iron can be needed due to...

see if it's the A11040/B, not every label was updated. Frank

That really depends on the graphics card itself. Max. colors won't change, as you can do 24 bit already with 1 MB (then limited to 640x480). With 2...

Mike, When I read this I had no idea what AH5050 meant. So I searched and found the attached information. If I was going to be able to set this...

It's easier to see with no CPU. You should just get FA0...FA6 incrementing and nRAS toggling at 2x; that should be enough for refresh. Everything...

Most drivers for Windows 1 and 2 are for printers and plotters. Besides this, there are a few display drivers (CGA, EGA and some specific display...

Maybe the potentiometers are not good anymore. If they are quite open to see the contact, they might be dirty, dust, oxydized, maybe you can try to...

Nothing will happen, apart from a bad-sector check done by the drive, because the 386 can not bypass the IDE circuitry and that will simply not do a...

I had given up on any hopes to get it to work again at that point, so I just removed them to see where the bumper stop was. In all honesty I didn't...

Looks like I have already grabbed that. The 11/04 has been sitting there ever since I got it because I was told it had an intractable PSU issue, but...

I looked at the refresh signals on the address muxes tonight. On the muxes themselves I connected the logic analyzer to the 7 refresh bits, the two...

When I said bad caps I meant presently bad caps not bad caps from back in the day. As in, I have a bad motor on my car. Meaning it’s presently...

Re: soldering iron. Depends on the type and application; 40W is typical. Whatever, get a temperature-controlled unit. You can do a lot of damage...