Found these inside a non-working 71B
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03-11-2018, 08:27 PM
Post: #31
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RE: Found these inside a non-working 71B
(03-11-2018 08:15 PM)rprosperi Wrote:(03-11-2018 07:53 PM)MikeSD Wrote: I think i will test these chips in another 71b thats known working. Math, FORTH and 64K RAM would be a good find, in a calc i marked junk a few years when it didnt work when I turned it on, assuming they are working. It appears to have all the connections it needs there are 3 pins next to +5 that are of no use to a RAM or ROM module they are there because these modules are designed to be put into front side plugins The fourth missing connection is Dout which is not brought back to the board because it goes on to connect to the other added RAM and ROM modules. Paul. |
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