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InterSystems was the computers brand name of the Ithaca company which previously manufactured various cards for other mainframe makers.

The DPS-1 is based on the S-100 bus. It seems to be a copy of the Altair 8800 and Cromemco Z-1 systems. The case had a 20-card capacity and can support 8 and 16 bit processors.

With a 16-bit Zilog Z8000 processor, the system could take up to 256 KB of RAM and run the Unix operating system, as well as the more usual CP/M.
It was the last computer proposing a front panel with switches and data/addresses LED.


Mark Mullin specifies:
There were actually two boxes as I recall, one holding the computer and the other holding great big nasty heavy quantum hard disks (20Mb each) - you could actually have more than one drive. The OS it ran was Coherent, a Unix 7 clone from Mark Williams in Chicago.

It was one of the first machines you could get and reliably and affordably run your own UNIX server - one thing that I do recall was that they'd built their own memory management unit on a S-100 card that attached to the cpu over an additional top bus - the card used static high speed ram to hold the segmentation mapping data, and the chips themselves had a nasty habit of walking out of their sockets every month or so - when the system started crashing a lot more than normal, you pulled out the mmu card and reseated all of the chips.

Steven Sorensen adds:
They made 2 styles of with a front panel, and one without. Later they came out with a cache-bios for their version of CPM, it became a real hot rod. Motherboards were by Godbout I believe. Early CPU boards were a little flakey at 4 MHz, but later cpu boards were great! I replaced the crystal section on the CPU board with a 6 MHz oscillator and Z80b CPU.

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
MANUFACTURER  Intersystems
TYPE  Professional Computer
YEAR  1979
KEYBOARD  Depending on the video terminal used
CPU  Z80, Z8000, 8080, 8086
SPEED  4 Mhz
RAM  8 KB up to 256 KB
ROM  2 KB (Monitor)
TEXT MODES  Usually 80x25 terminal
SIZE / WEIGHT  Unknown
I/O PORTS  2 x Serial RS232, 1 x Parallel
BUILT IN MEDIA  Various FDD and HDD configurations
OS  CP/M, Unix
POWER SUPPLY  Built-in Power Supply Unit
PERIPHERALS  All of the S-100 cards and associated peripherals
PRICE  About $7200 for a typical system (64 K, 2x600 KB disks, Printer, video terminal)

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