I have seen several of these myself. The last time at MCH2023 [1]. The hacker space TkkrLab used to own one [2]. I think they have disposed of it, because it was just collecting dust.

[1] https://commons.m.wikimedia.org/wiki/File:Mch2022-computermu...

[2] https://wiki.tkkrlab.nl/tkkrlab.nl/wiki/Holborn_6110.html

Beautiful hardware, but wouldn't a 3.5MHz Z80 have been underpowered for a server in the early 80s? That's the CPU in a Spectrum 48k, not exactly a high end machine in 1982.

That depends a lot on what you want to use it for. A Z80 can stream data to/from RAM at several hundred kilobytes a second, do binary search at tens of kilobytes per second, or calculate hundreds of floating point values a second with a softfloat library.

For basic word processing on a terminal, that is fast enough to support potentially dozens of simultaneous users. There were a number of software packages in the 1980s that would run a virtual machine interpreter, providing a multitasking multiuser environment with integrated high level languages, databases, office applications, etc. on 8-bit microprocessor hardware. Also plenty fast for a print server or similar, at that time. But, on the other hand, the 64 KB address space isn't really enough to fit even a basic optimizing compiler.

Consider the time. A 'server' usually meant 'shared file and print', not so much applications (or at least limited ones). And the disks were a couple of orders of magnitude slower than they are now. So you had a lot less overhead and could heavily optimize for smaller numbers of use cases (which made Novell very successful for a good while, tho not on z80). Also, networks were a lot slower. Ethernet had just been introduced and hadn't taken over the world. Most nets were some sort of serial network (< ~1Mbps) or maybe Arcnet (~2.5Mbps). So, yeah...there were Z80 servers. MP/M was a common operating system for them, but as we see it wasn't the only one.

No, not high end by any means, but when running some basic business software (think rudimentary CRM, inventory management and spread sheets), quite possibly written in BASIC, chances are the floppy disks, daisy wheel printer and (few) attached 9600bps terminals would be the bottleneck.

Those things didn't compete with a Cray, they competed with a filing cabinet, desk top calculator and typewriter.

Never underestimate the obsession Europeans had with the Z80.

There was a multiuser version of CP/M, so why not?

https://en.wikipedia.org/wiki/MP/M

Depends on how much the Z-80 is doing. You can go the C-64/Atari way where the filesystem is running on the disk drive and the main CPU just runs the applications.

On Atari 8-bits, the filesystem ran on the computer itself. There was an MOS 6507 processor in the drive, but that was for communicating on the SIO bus.

https://en.wikipedia.org/wiki/Atari_1050

Fascinating. I wonder if one could fit a filesystem in the floppy ROM - this would free up memory in the host computer for other operations, and allow extended functionality in the filesystem that's absent from existing implementations.

A delightful design with shades of inspiration from the Computer Space [0] cabinet .. I wonder if anyone ported that to the 6500?

Would be delightful to find one of these in some dusty warehouse somewhere. Something is really missing in todays computing environment, which is somehow very evident in the old ways.

[0] - https://en.wikipedia.org/wiki/Computer_Space

For a second I thought somebody built it today using the same design with modern innards.

Someone should.

There's a Holborn 6110 terminal on display in the Home Computer Museum in Helmond, Netherlands, apparently: https://www.homecomputermuseum.nl/collectie/holborn/holborn-...

Looking at photo of the inside, that's a lot of IC's + wiring for a machine with those specs. And all in chunky, custom designed housings.

Must have cost a lot to design & assemble those. No wonder they went bankrupt.

Still sad though. Absolutely iconic design. These machines must have featured in a movie or 2?

Those computers are terrifying. They remind of The Triffids. (https://www.themoviedb.org/tv/2609-the-day-of-the-triffids/i...)

I get this when accessing the page: "Notice to users in Brazil Because of Brazilian government demands to remove creators from our platform, Locals is currently unavailable in Brazil We are challenging these government demands and hope to restore access soon"

> Note: The “Holborn” name is to signify that these computers were “Born in Holland”. Hol. Born.

Not entirely accurate as the company was in Hengelo, Overijssel but "Overborn" just doesn't have the same ring to it.

Nice story! The debt of 3.5 M NLG should be converted to 1.7 M dollar, not 7 M.

They don't look like 1950's sci-fi style to me, but quite later.

It's very jet age/high modernism, which suggests a kind of late 1950s-early 1960s vibe. Like you'd expect these in the Eero Saarinen TWA terminal at JFK.

Far too small and not enough blinkenlights for 1950s SF.