Ever heard of a Dutch company called Holborn (literally, born in Holland)? We hadn’t either, but [Bryan Lunduke] showed us these computers from the early 1980s, and we wondered if they might have appeared in some science fiction movies. They definitely look like something from a 1970s movie space station.
The company started out tiny and only lasted a few years. The Holborn 9100 looked like a minicomputer and, honestly, other than the terminal, looks more like an air conditioner or refrigerator. While it was a Z-80 system, it was clearly aimed at business. The processor ran at 3.5 MHz, there was 72K of RAM that could expand to 220 K — a whopping amount for the early ’80s. They also could accept loads of 8-inch floppies. It even had a light pen, which seems exotic today but was actually fairly common back then.
When we heard you could go to 220 K of memory, we assumed it used a version of CP/M or MP/M that understood bank switching. Nope. They developed their own multiuser operating system. The OS was totally in ROM, so finding out any details about it is difficult.
Their next computer was a cheaper version that only supported two terminals, the Holborn 7100. There were only 200 9100 systems sold (or at least, claimed to be sold), and presumably fewer of the stripped-down model.
By 1982, CP/M was rising, and the company realized that its OS was not catching on. That led to the Holborn 6100 which was a CP/M machine that could handle 192K of RAM. Same mod terminal, but a much smaller box that could pass for a floppy disk NAS today. They sold about 100 of these ..
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