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Background See my web page at [here]. Update Finally. I accidentally caught one of my IBM 5150 motherboards (type 16KB-64KB) doing this. I accidentally had socket U33 empty. Over the course of the motherboard being powered on for about 30 minutes, the tone varied from continuous, to...

I've been a dad now for 29 years, and so I am much practiced. High-quality dad jokes are to be expected. But you don't have to be a dad to create dad jokes. In preparation for fatherhood, evolution has gifted all males with the ability to create dad jokes.

I see that all antibacterial cleaning products kill 99.9% of germs. So, I will become a billionaire by designing a cleaning product that targets the remaining 0.1% But hang on. I wipe a table using one of these products. That leaves 0.1% of germs intact. If shortly after, I then wipe the table...

I have enhanced Ruud's Diagnostic ROM to detect certain RAM addressing failures. It is now at version 3.2 Available at minuszerodegrees.net The RAM checks on-screen are now: * Check first 2 KB of RAM * Testing RAM - Data * Testing RAM - Address The RAM addressing check is using the same...

Fully functional. Good condition. - IBM 83-key keyboard. - Motherboard of type 16KB-64KB, fitted with 10/27/82 BIOS. - Early power supply, of 220/240V operation. - Tandon TM100-2 floppy drive (360K) (no IBM logo on front). - Early version of 'IBM Monochrome Display and Printer Adapter' (MDA). -...

I decided to better understand the dynamic RAM refresh circuitry on the IBM 5150 motherboard. I documented that at [here], not only for others, but for myself (when dementure starts kicking in). I expect that the IBM 5160 motherboard is pretty much the same.

On my list-of-things-to-do, was an item to repair a faulty IBM 5150 motherboard, one that I had acquired years ago. Prior to acquisition, the motherboard had had a card fitted where the on-card battery had leaked. There were some faulty chips (right next to the slots). No damaged tracks, but...

I did some experimentation. The results are in the table at [here], which shows the symptoms of having an IBM 5150/5160 motherboard's video switches set incorrectly. Of interest: * Not all cases result in the '1 long + 2 short' error beep sequence. * For the IBM 5150, the second (and possibly...

http://minuszerodegrees.net/thoughts/rays_thoughts.htm

Clearly, the popularity of my minuszerodegrees.net website has reached the point where companies are now naming products and businesses after it. See [here] and [here]. I knew I should have trademarked it. :-)

I have put some stuff at [here]. (Yes, some of it is quite old.)

Santa's Visit Application: http://minuszerodegrees.net/funny/Christmas/Santa's%20Visit%20Application.pdf

I have scanned the reference for IBM DOS 3.3 to PDF, and placed the PDF at [here]. (You may need to refresh the page in your browser in order to see the new link.)

I have scanned the user's manual for the Toshiba T1100 PLUS, putting it on my web site at [here].

THE TRUTH The human race was wiped out in 532 BC by a mass extinction event. In a galaxy far far away, an alien species was curious to see what would happen had the human race survived. So, on one of their super computers, they set up a virtual Earth. That's right - you, me, everyone, is a...

On eBay Europe. IBM 5162 (XT Model 286). RAM problem. eBay item: 301603237946 I am in no way connected with the sale.

I have added a web page to my web site. That page is titled, "IBM 5160 - Significant Differences to the IBM 5150". That page is [here]. Note the keyword of "significant". The final section on that page is about the change in reserved I/O ranges. If you have the required level of technical...

From MikeS: "A couple of old (1995 & 1997) Toshiba 'Atlas' CDs with dealer service information recently turned up on CCTALK; they contain parts lists and service manuals for quite a list of older Toshiba systems." Thank you Mike for bringing them to my attention, and thank you very much to the...

I have added two Canon manuals to my manuals web page at http://www.minuszerodegrees.net/manuals.htm * Canon AS-100M AS-100C - Field Service Manual * Canon CX-1 computer - Instruction Manual (You may need to refresh the page in your browser.)

I recently discovered a small collection of PC-family related manuals. I have scanned some and added them to the manuals that are [here]. More to follow.