Thank you very much. That did the trick. Note to myself: taking pictures if entering "unknown" territory. 😉

I cleaned and lubricated one of my spare floppy drives recently. I did this with different drives a few times, but this time I struggle to put it back together afterwards. May someone hint me in the right direction? I dont know how to put back the thingy that slides the metal dust protector to the …

I received an old early Pentium era PC today. Originally I bought it to harvest its power supply for another build. The complete machine was the same cost as a PSU alone. So gave it a shot and bought it without knowing whats inside. Its a common little computer shop build which are long gone. I miss …

Thanks alot. Than I'm out of luck with this module and try to get another one.

Statson mentions a jumper but it is not on the motherboard. The boards manual does not mention any jumper regarding cache sizes.

My Socket 7 retro machine has an MSI 5128 v1.1 motherboard in it like documented on https://stason.org/TULARC/pc/motherboards/M/MICRO-STAR-INTERNATIONAL-CO-LTD-Pentium-MS-5128-VE.html. I came to the possession of an COAST module in the idea of upgrading the machines L2 cache from 256k to 512k. PXL_ …

I'm about to build a new rig based on an MSI 5128 v1.1 Socket 7 board and an MMX CPU. I currently have an Pentium MMX 200 SL27J which I want to run at 133 MHz to have it passivly cooled. If I set the switches according to the PCB printing I get weird results. The board has a row of dip switches …

I always filed above the resp. pins down until I reached the metal. I`ll try your way the next time.

Thanks alot. I feared that those Dalles modules are completly sealed units. Mines were from 1995/96 and I assume they are dead or soon to be. If I file them down to the leads I'm halfway done in modifying it. I think I'll modify them and put a coin cell on top.

I got a bunch of Dallas modules from eBay a while ago. I doubt they are new old stock as advertised. Is there any way to check their voltage without or better say before modifying them?

I'm currently building a retro machine with a case which has a rocker switch (to be delivered by Aliexpress atm) and a speed display. Will be a quite nice machine when its ready. :-) IMG_20201101_142610.jpg One point I came across is the turbo display. I dont know how to wire it up and dont want to …

I recently bought a bunch of those 387 PLCC chips. They do work quite well in my PS/2 56 which uses a 386SX @ 20 MHz. They are labeled as being 25 MHz parts. They were detected by the reference disk tools and also by a bunch of hardware diag tools I could test. I assume they are legit chips, …

For my 2nd PS/2 I recently aquired a 270 MB SCSI drive (IBM-labeled Quantum LPS, https://stason.org/TULARC/pc/hard-drives-hdd/quantum/PRODRIVE-LPS-270-S-270MB-3-5-SL-SCSI2-SE.html). The drive was jumpered to ID2, but to be bootable in an PS/2 it has to be at ID6 as far as I understand it. …

Yes they exists. The PS/2 Model 30 is one model, either with an 8086 or an 286 CPU.

It would be very kind if you could send me one or two of those PCBs. I actually never tried SMD soldering before but I'm willing to learn on the go. Unfortunately I could not PM you, probably due to my low posting count. Maybe it is working the other way around?

I probably could need one or two of those Alt12887 replacements as I prefer a clean solution over hacking and glueing an old Dallas module. The Alt12887 should be drop-in compatible with old DS1287 modules used in IBM PS/2s. Unfortunately there seems only sources for this project in the United …

I had boot problems with some of my SD/CF-equipped retro machines too. My PS/Valueline wont boot from CF but could access it without any problems while booted from other media. I coud fix the problems by using GAG, which is a boot manager. Maybe it could help you too. http://gag.sourceforge.net/