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[date: 2004]
I stumbled upon this years ago. All I knew about it at the time was that it was an S-100 machine. Currently it only has the case, power supply, and S-100 backplane.
I believe it was originally a Integrand Research Model 800.
Apparently it could run MDZ/OS, of which there is a mention in InfoWorld March 14, 1984 (volume 5 number 11), page 71.
A post on eBay, with the only matching picture I have ever seen, said:
This listing is for a very rare Integrand Research Model 800 based "Miserly Mainframe", with a 10 Slot S-100 Bus, a TeleTek Systemaster Z80A Single Board Computer, twin 5 1/4" Floppy Disk Drives and Power Supply.
The system was badged as the MDZ 800 by "Micro Mike's Inc", an Amarillo Texas computer company and has serial # 0100. At its heart is the Teletek Systemaster - a complete S-100 system on one board. It incorporates a Zilog Z80A CPU, DMA, floppy disk controller, I/O (2 parallel and 2 serial ports) and RAM. It is accessed through the serial ports, via a terminal (or terminal emulator, these days).
The idea behind the "Miserly Mainframe" concept was that the Operator could add Teletek SBC-1 slave boards, to provide each user with his/her own CPU, 128k of segmented memory, two serial ports, and two parallel ports. Because each user had his own CPU, the addition of other users to the system caused far less speed degradation than was then available with "time-sharing" multi-user systems. With the Systemaster as the master processor in the system, Teletek called it "... a state-of-the-art multi-processing system that begs comparison!". Micro Mike's even wrote (alongside other software) their own MDZ/OS version of CP/M, optimized for a multi-user, multi-proccessing environment - Mike, of Micro Mike's called it "... the first multi-user microprocessor system which actually worked"!
This system is in good cosmetic condition, with some scuffs and scratches. It has been tested to power up, spin the drives and respond to the reset button, but we do not have a CP/M or MDZ/OS boot disk, so are unable to test it further and no further functionality is guaranteed.
Forget Blade Enclosures & Servers, this rig had the concept beat by decades! This is the only one on ebay and the only one we've ever seen - don't let it get away!