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Hello, I wonder why the disk CMI 6426 is labeled as type 2 in the IBM disk table. Type 2 is defined as 615/4/17 as we know. CMI 6426 has 640 cylinders according to several sources. Was it an attempt to fit into predefined IBM tables? R.

Hello, someone who can sell this floppy drive? Ideal in black color. Thanks

Hello everyone, just like almost every year, our high school is organizing an Open Day. As part of this opportunity, I exhibit my historical computers for the visitors, mostly elementary school students. Later, during the regular computer class, I give lectures about the origins and history of...

Hi there, I have another one of my unresolved dilemmas again. Which disk should, according to correctness and historical accuracy, be placed in the IBM PC XT-286? My piece was manufactured in 1986 and came with a non-original ST-251 disk. I know that IBM PC XT-286s were supplied with two...

Hello, I have a problem with MFM disks, especially the ones offered by IBM for their early PCs. Specifically, I have the Seagate ST-412 and Miniscribe 2012 models installed in IBM PC 5160 and 5161. I only power them on on special occasions, and I always test them using the Spinrite (on level 4)...

Interesting fact, Original Compaq Portable was not so fast, actually according to my tests, it was little slower than IBM PC in CPU computing. Its strange fact, because they both are using Intel 8088 CPU on 4,77Mhz

Hello there, I would need an original Visicalc from 1979 for my Apple IIe. Where I can donwload some image or something similar? I have only experience from site https://asciiexpress.net/ where i can load programs from site directly to computer through audio cable. I can also load programs to...

So after two years of inactivity caused by Covid I finally could start within Open Door Day in our school my Vintage Computer Exhibition. All machines was ready and prepare for stress test. Luckily everything turned out well and I can share some pictures from this action with you. After Open...

Hello, what is The most reliable way of finding bad blocks on MFM drive? I usually use IBM enhanced diagnostic disk for PC XT for low level formatting hard drives on my IBM XT with ST-412 hard drive. This done without fine without finding of any BBs. Also high level format did not detect any...

Ok, another problem here. Picture on my Portable display is shaking and its very disturbing to do something on it. Any solution for this? https://youtu.be/Mq0u15MpWN8

Hello, I have troubles with opening my Compaq. Is there some trick? I watched some videos on Youtube and I dint see any problem with that. I can open it only like this (picture) nothing more, I tried as hell and nothing. This is bottom plate, upper is already opened.

Hello, I have ISA HardCard 20 from Maynard Electronic. There is nice 20MB 3,5" MFM hard drive. Problem is with disk rotation. When I turn it ON, disk is not rotating, but when I start gently turning with ring which is connected to moving heads, disk start rotating and work without problems. When...

So, probably we all know this chart of IBM PC's produced. I dont know to understand these numbers. Is this numbers of PC's produced ever, or only in US? Because its very suspicious IMHO. IBM PC 5140 23.000 pieces produced and IBM PC 5162 only 15.000? I dont believe this. These computers are...

I am not drunk! What to hell is this? Never heard about these numbers.

Hello, I tried connect my ST-4053 to IBM AT (type 3 board). First problem - ok this disk is not supported by IBM BIOS, its 1024/5/17 and this CHS parameters are not compatible with any type of supported disks. So I tried format this disk to nearest supportable type number and this is type 17...

Talk is about TYPE 2 AT motherboard with 6 MHz CPU, 13.8" x 9.4", BIOS dated on 06/10/85 and 1 bank of 512 KB So...What is wrong with this revision of IBM PC AT motherboard? Never saw it nowhere. No pictures on internet, nothing. Its really so rare or where is the problem? Any suggestions?

WTB IBM PC 5140 keyboard, I have also US address, so dont worry about shipping.

If someone sell it for normal price, PM me. I have also US address.

Hello, someone with switching manual for this card? Thanks

Hello, i obtained this piece. First I had to replace X2 capacitors in power supply because it was blown, but nothing more was necessary at first sight. I turned on monitor and connected it to PC. Picture is very dark even though brightness was on maximum. I also tried sub brightness and sub...