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Flakey HP 70: post modified as RAM Chip identified.
10-22-2015, 07:18 AM
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RE: Flakey HP 70: post modified as RAM Chip identified.
(10-22-2015 06:52 AM)Geoff Quickfall Wrote:  Aha, that's the table I am using!

Tomorrow I will harvest a RAM from a 45 and see if that fixes the 70.

By the way, the stack as well as the 4 basic functions all work, it is jus the higher registers that return a 0 no matter the input.

Thanks Didier.

Geoff

Does sound very much like a RAM problem.
It could be the ROM that partially works and instructions related to the financial functions don't work, but that seems rather unlikely.

I nearly bought a 70 the other day - but couldn't justify spending that much money and ended up loosing the auction...
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Messages In This Thread
RE: Flakey HP 70 - Geoff Quickfall - 10-22-2015, 06:22 AM
RE: Flakey HP 70 - Didier Lachieze - 10-22-2015, 06:42 AM
RE: Flakey HP 70: post modified as RAM Chip identified. - Harald - 10-22-2015 07:18 AM
Damn it!!! - Geoff Quickfall - 11-08-2015, 01:48 AM



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