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From searching that model I guess it might be a Phoenix BIOS which I presume has a checksum feature. Personally without a known good BIOS to compare against I would calculate the checksum, then...

Oh, that's all? I'll get started on that then. :cool:

Thank you.

I would like to better understand how hard drive controllers with dedicated cache utilized their resources. What was the most optimal caching strategy used by vendors (what to store, and when)?...

Thank you!

For future visitors who may not understand... GB was a typo on my part instead of MB and I couldn't find a way to edit my post to correct it.

Yeah... didn't you get the memo about the new BIOS hack? ;)

The pins of the PLCC-32 EEPROM connect to the DIP-32 footprint pads so it is probably an alternate location.

Nevermind, it installed quite smoothly! I guess I was expecting more trouble.

I would like to install OS/2 Warp 3, for which I have original media, to my PS/2 model 80 with the following drive configuration.

A: 1.44 Floppy
C: 120GB SCSI Formatted fresh and MS-DOS 6.22...

A little Sunday morning adventure...

I've been messing with an Adaptec AHA-2940UW controller that in various machines would either lock the machine at the point that the SCSI BIOS should kick in,...

I'm curious what ATCFWCHG actually changes within the CF card? Config bits in a non data area?

In the words of Jerry Reed, "When you're hot you're hot!"

It's the 'Seek Thermal Reveal' which is the self contained unit vs. the one that attaches to a smartphone. It was $250 about 3 years ago but evidently the price has gone up a bit. I bought it to...

I few weeks ago I was tinkering on a 5160 that would only count to 64K even though it had 256K onboard + 256K on a card. I have a cheap thermal camera so I took a peek and... viola, it stood out...

Very nice, I like 286s so I like your project. I appreciate the fact that you've taken it a bit farther than swapping average parts by changing the CRT too. It sounds like you have aspirations of...

Yep, I understand, that's why I said I may get back to checking the other caps and that I am assessing other potential damage. Busy week at work and home though so I had to set it aside for a week,...

I picked up a cheap GRiD 1450SX of unknown condition, without power supply. It's got one of those round connectors with 2 large pins and 1 small pin... common on receipt printers and surely many...

I'm working on repairing a T3200SX power supply. It's pretty roomy and the PCB is single sided so it wasn't too hard to sketch a rough schematic at least good enough for me to get a perspective and...

Okay, that's what I was wondering. Maybe the PSU waits until stable to output, or maybe it's just a free for all! Regarding the troubleshooting... The caps look very nice and the ones I've tested...

I picked up a T3200SX that won't power on. There is no DC output at all from the power supply and a beautiful squeal. I'm still working my way through the circuit but my question is... When the...

I ended up not going RLL. When I initially started this thread I was looking at controllers and drives on hand to figure out which way to go with a project. An MFM controller then fell into my lap...

Alright good, so it's not unheard of. I'll proceed to test the CPU elsewhere before I move on to the logic. Thank you.

I have an AGC AC1100-12 'TURBO BOARD' board that I've been tinkering on here and there, trying to get it working. It's CPU is a Sony CXQ70108D-8 which I understand is a V20 and I feel that it's...

Thanks, your info led me to some other info, which then led me down a rabbit hole. Then I chucked the controller in a box and put it on a shelf because I have since acquired another one with a known...