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To be exact, the Olivetti M24 mouse was the first Logitech mouse ever.

Curtis (including this model, the PCM) made sold-state drive emulators and was well-known for that up until about 2000. Note the ad here. I...

"Our" (meaning the MCA Mafia/Militia's) primary information sources are here: http://ps-2.kev009.com/ohlandl/ps-2.html which is a subset of:...

My guess is that the ROM is corrupted. The 2K does not have a BIOS on board, it loads it from the disk. The ROM is pretty simple too, set up the FDC...

Stason.org is my "go to" site for motherboards. https://stason.org/TULARC/pc/motherboards/A/AMERICAN-MEGATRENDS-INC-386-MB-1333-40-AEQ-K-AEG-K.html

Here is a link to the detailed repair of the acid damage my friend did on my PB410 board: https://youtu.be/fnxlv9Snqe0

First of all, I'd be suspicious of the system's health. Before tackling the hard drive, verify the rest of the machine is working with some...

It sounds like some parts of the hard disk are not readable. That could be because the disk or controller is failing or because the controller is not...

Well, that is exactly what I'm doing :) I'm starting from scratch with my own compiler and linker, so the INT 0x80 interface is all I have at the...

Pessimist! ;)

Unlikely to be a cache controller card, however. "ROMDISK" and no RAM on the card (nor any way to add RAM) kind of rules that out. For a forensic...

First couple years at Siemens I saw a couple of them around (though they never made it to the scrap sales). I'd probably have passed on them even if...

The SL82C365 appears to be a 386/486 cache controller The SL82C365 supports direct-mapped cache system with data size ranged from 16KB to 1MB ...

>>> would it make sense to have him build a simple NOP Generator to check out the Address Bus? I think it would. I can conceive of an addressing...

A hardware lock more likely. I don't know these such old, but similar cards do exist for IDE and SATA that act as a pass-thru and filter out any...

Thanks, I was not exactly sure how the phantom system was supposed to work. It is an interesting thing with the Spectrum card, because when its...

Dave, Excellent idea of Data Bus NOP Generator! It is a much needed tool. I'll cut an EPROM and ship to Mike. In the mean time, would it make...

This is a very common problem with the Tandy 2000. I have a couple of these with the same issue. Have also seen some on Eb@y listed with the "won't...

In the age of CP/M computer and such you needed an EPROM programmer to program a PROM, EPROM or EEPROM with a monitor program (not called a BIOS...

Are you sure it isn't locked up? Have you run the Compaq diags?

If you have a S100 extention card, you can hack a memory remapper to it. It wouldn't work well in the case. If you don't mind tacking wires to your...

The logic probe sampling frequency is 2 MHz. That is not enough? I need like 10 MHz sampling frequency to capture data been transmitted at 4.77 MHz ?

Again, it's all the same chip--just different foundries. The only thing to be really aware of is the non-A parts--they have a much longer...

I'm not sure, are you trying to use software to activate phantom? I believe it is normally done by a hardware circuit. When the card that you want to...