Recent content by trag

There were a few years during which a 1 MB SIMM cost $100+, while 256K SIMMs were free or less than $5 each. Such conversions made a lot of sense during that period. Newlife made a pre-Plus upgrade that mainly added SCSI, but also had 8 memory slots that could take 256K or 1 MB SIMMs. Put...

I have seen optical disk juke boxes that used multiple LUNs, but I think it depends on how the manufacturer wanted to configure it. That is, not every disk changer may use multiple LUNs. Some might occupy multiple SCSI IDs.

I had never seen it before. Now I must go watch that film...

Used extensively in Outbound brand Laptop clones.

That's why one would need to "figure out a way"... The particular model I listed -- which I am rather fond of for what I am beginning to suspect are irrational reasons given the overall reliability I'm seeing, but then again, even if unused, the drives are very old and likely to be suffering...

Lifetime Supply of Favorite Spatulas ACHIEVED! Many thanks to @slomacuser

Ah, well, beyond the obvious of inspecting the board, that's all I've got. Hmmm. Let's see... Ah, here we go. If you do not have this, it should keep you busy a while. Here's the 7200 schematic. You can check your connections if you have lots of patience and a continuity meter. I...

Too bad you can't use HM658512ALFP chips, or could you? I have about 300 of those sitting here doing nothing. Got me wondering. Looks like the pinout isn't quite compatible. As might be expected, A17 and A18 are the main problem. I was hoping they were NC on the 658128, which would leave...

Can you tell if it is booting (hard drive or floppy drive sounds) even if t here is no video? If it is not booting, or you can't tell, and even if it is booting, but it won't solve your issue in that latter case, replace the heat sink compound between teh PPC601 and the heat sink if you have...

Or figure out a way to replace the full sized optical drive with a Slim/laptop optical drive. That frees up a lot of thickness and adapters are fairly easy. Although for parallel ATA one would probably need a serial to parallel adapter as well. Drives like the TS-T632 are getting very tough...

Anyone ordering PCBs for 30 pin or 72 pin (or 64 pin) SIMMs should remember/be aware, that they need to specify 1.2mm thickness, and actually, the thickness should be 1.27mm. 1.2mm will probably work okay in newer, unworn sockets, but may be too loose. PCBs these days default to 1.6 mm...

And boards arrived on my doorstep today. Today is Wednesday, unless I am very confused (easy to lose track of day of week after retirement) and I ordered early Thursday morning. So less than one week from order to delivery (in Texas) for this reorder. There were a couple of emails with...

Thank you. I don't know the cause of the issue. Hearing that it existed was the extent of my knowledge. I appreciate the extra detail you provided.

I have not been following in detail. Have you looked at addressing/solving the loss of performance when the address strobe signal is used for RAM greater than 5 MB (4 MB?)? Apologies if I'm mistaken about that. I think I saw it in one of @JDW 's videos.

Did you ever find the Rev B RFSHCNTL.PLD source — the version updated for GAL22V10?