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Author Topic: NCR 8250 Hardware Information Required  (Read 7802 times)
Aleksandrs Guba
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« on: November 25, 2007, 09:52:26 am »

Is there anyone familiar with NCR 8250 Hardware and able to confirm whether 8250 had the MMU unit or not? As far as I know the 605 GPMC has no MMU circuit on the board, however, the 8250 machine operated the multi-partitioned program concurrently. Am I right that if there was no MMU, the machine might handle the partitioned program through the index register?

« Last Edit: November 25, 2007, 09:54:53 am by Aleksandrs Guba » Logged
wally
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Posts: 44


« Reply #1 on: August 03, 2009, 09:52:58 am »

You are right, the NCR 8250 had no MMU (Hardware).
Operations like that were done by IMOS (Software).
The 605 was a very modern CPU for its time and also fast.
As it is a long time ago, that is the best I can remember.
The funktions of the 605 are described in the NCR 605 TECHNICAL HANDBOOK.

http://www.thecorememory.com/NCR_605_Programming.pdf
« Last Edit: August 03, 2009, 10:34:36 am by wally » Logged
Matthew
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Me and my wife


« Reply #2 on: August 25, 2009, 10:54:27 pm »

Towards the end of sales, we had a few 8270's equipped with ECC-Board here in Switzerand.
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Matthias Hiltpold
Field Service Eng/Supporter/Quality Manager
1968-2001
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