HP 86: Strange Error
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11-19-2017, 04:23 AM
Post: #3
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RE: HP 86: Strange Error
(11-19-2017 12:22 AM)rprosperi Wrote:(11-19-2017 12:07 AM)Michael Fehlhammer Wrote: My newly acquired HP 86A displays a strange warning immediately after power on: The "ROM number" it is referring to is the select number the ROM is programmed to respond to. In the series 80 machines ROMs are selected by writing this ROM number to a specific address that all the bank selectable ROMs monitor and when a ROM sees its number come up, it enables itself, and if it is someone else's number the ROM disables. Between the 83/85 and 86/87 machines ROMs with similar function have the same ROM number, for instance the assembler ROM is ROM number 40 on both, and if you had both the 83/85 and 86/87 ROM plugged in at the same time both would respond to the ROM number by turning themselves on and the result would be unpredictable, I would suppose that a defective ROM could cause a similar result, the best way to check would be with a diagnostic ROM as it does a more comprehensive test of the ROMs . |
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Messages In This Thread |
HP 86: Strange Error - Michael Fehlhammer - 11-19-2017, 12:07 AM
RE: HP 86: Strange Error - rprosperi - 11-19-2017, 12:22 AM
RE: HP 86: Strange Error - Paul Berger (Canada) - 11-19-2017 04:23 AM
RE: HP 86: Strange Error - Michael Fehlhammer - 11-19-2017, 07:56 PM
RE: HP 86: Strange Error - Paul Berger (Canada) - 11-20-2017, 12:01 AM
RE: HP 86: Strange Error - Martin Hepperle - 11-21-2017, 01:48 PM
RE: HP 86: Strange Error - Michael Fehlhammer - 11-21-2017, 10:06 PM
RE: HP 86: Strange Error - Paul Berger (Canada) - 11-21-2017, 10:57 PM
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