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I > INTERSYSTEMS > DPS-1   


Intersystems
DPS-1

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 cases...one 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.
Please consider donating your old computer / videogame system to Old-Computers.com or one of our partners.


 

Responding to your page at https://www.old-computers.com/museum/computer.asp?st$1$c$574

In late July of this past year, I acquired an auction lot that had one of these boards for the front panel of one of these systems.

Are these images helpful to you?

https://drive.google.com/file/d/17_roXmU2H8rzRV1YTeYZJFhb6Haz19DQ/view?usp$sharing

https://drive.google.com/file/d/1pN4RpgRt0X5rIbfy1HvzIY2NTorwXZLL/view?usp$sharing
Google Docs

          
Thursday 29th October 2020
AJ (Iowa/USA)
Entrex 480

Sat 4/14/18 7:54 am. Well I worked at Ithaca Intersystems in the golden days and lived to tell the tale, not that there''s so much to tell.

owenlabs@aol.com

          
Saturday 14th April 2018
James Gregor Owen (Florida USA)
owenlabs.org/index.htm

In my post below, I didn''t finish a sentence.

The company I worked for sold Ithaca Intersystems computers with the usual trusty Televideo terminals, with the monochrome monitors.

          
Friday 18th August 2017
Loretta M. (California, USA)

 

NAME  DPS-1
MANUFACTURER  Intersystems
TYPE  Professional Computer
ORIGIN  U.S.A.
YEAR  1979
BUILT IN LANGUAGE  None
KEYBOARD  Depending on the video terminal used
CPU  Z80, Z8000, 8080, 8086
SPEED  4 Mhz
CO-PROCESSOR  None
RAM  8 KB up to 256 KB
ROM  2 KB (Monitor)
TEXT MODES  Usually 80x25 terminal
SOUND  None
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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