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I was relating to a colleague my tale about troubleshooting memory issues on a XT clone motherboard with 640K RAM on board. I told him that I had found a defective 256K RAM chip and a defective 64K RAM chip. I said that I had a replacement 256K chip on hand but that I would have to order a 64K...

I use the Macro Assembler AS.

Dental floss hack...

Thanks.

Well done. Please let me know about the mistakes in the schematics that you found so I can correct them.

Typically the results of the keyboard scan are returned in the accumulator of the Z80 CPU. In other words, it’s all internal to the CPU. It doesn’t really exist as something you can pass through a KVM.

Found the answer to question 1: "YUV Pixel Double".

Impressive work! I have two quick questions: 1. How do I "join up the dots" to make my display look like the third picture above? 2. Do I need to explore all the menu options or will I only be getting myself into trouble? Thanks.

If you like my 4004 SBC, you might be interested in my Intel 8008 Single Board Computer.

Very nice. - Jim Loos

You can build a daisy wheel keyboard/printer "terminal" from a Wheelwriter. https://github.com/jim11662418/wheelwriter-teletype

I've tried four different adapters from Amazon (in the range of $10 to $40) without success. My Samsung 55" HDTV displays the composite video from my C1P, but these adapters choke on it. I'm on the lookout for an old 4:3 aspect ratio LCD TV.

I've recently acquired a vintage computer (specifically on Ohio Scientific C1P) that outputs composite video. Has anyone had success with adapters found on Amazon, eBay and other places that purport to convert composite video to VGA or HDMI? If not, what's an inexpensive way to display a...

Thanks.

I recently acquired an OSI C1P on which, alas, the stabilizer for the space bar is missing. If someone who has an OSI keyboard would post a photo showing details of the stabilizer, I'm hopeful I could replicate a stabilizer using a piece of piano wire. Thanks in advance.

This Windows vs. Linux debate is always tiresome to the rest of us whenever and wherever it pops up. How many times do you suppose that someone has abandoned their favorite operating system and chosen yours because of the arguments you make? You could probably count them on one hand with fingers...

It's possible that the Typestore connects to what IBM calls the "Feature Connector" on the Wheelwriter's Printer Board. That would allow the Typestore to monitor the serial communications between the Wheelwriter's Function Board and Printer Board. The Typestore could then determine which keys...

The "feature adapter" is referred to by IBM as the "Printer Option". The Printer Option allows the Wheelwriter to function as a printer with a standard Centronics parallel port. The Printer Option recognizes a subset of the Epson ESC/P printer control codes. I've got a Printer Option and the...

I happened across this at the bottom of this page: "The pictures below show an assembled COP421 emulator board used to replace the COP421-HZT/N on the I/O board of a Lisa 2/5."

I have an IBM Wheelwriter that I'm trying to make emulate a Diablo 630 and thus have a question about daisy wheel printers that are capable of reverse printing: When reverse printing, does the printer: 1. print the character at its current position and then move the carriage to the left or...