Bob Armstrong
2020-06-01 14:38:10 UTC
I know that the TD8E would not work with certain memory and/or CPU combinations because speed problems. The TD8E uses programmed I/O to transfer each line of DECtape data and the timing just barely works. But I don't know/can't remember the exact rules. Can anybody remind me?
I believe that the KK8E CPU with MM8E core memory WORKS.
I believe the KK8E CPU with the MM8A core memory WORKS (i.e. an 8/E CPU in a BA8C chassis).
I think the KK8A CPU with MM8A memory also works (i.e. 8/A CPU in an 8/A chassis).
I think that either CPU with the MS8C (8/A MOS memory) DOES NOT work (presumably because of the refresh delays).
Am I right? Are there any more combinations that are OK or not OK? Is the MS8C the only combination that doesn't work? Were there any other memory options that I've forgotten?
Thanks!
I believe that the KK8E CPU with MM8E core memory WORKS.
I believe the KK8E CPU with the MM8A core memory WORKS (i.e. an 8/E CPU in a BA8C chassis).
I think the KK8A CPU with MM8A memory also works (i.e. 8/A CPU in an 8/A chassis).
I think that either CPU with the MS8C (8/A MOS memory) DOES NOT work (presumably because of the refresh delays).
Am I right? Are there any more combinations that are OK or not OK? Is the MS8C the only combination that doesn't work? Were there any other memory options that I've forgotten?
Thanks!