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FRAM71B and overclocked HP-71B
02-25-2024, 10:32 AM (This post was last modified: 02-25-2024 10:44 AM by J-F Garnier.)
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RE: FRAM71B and overclocked HP-71B
Note that late HP-71B used the 1LK7 Saturn processor that provided more timing margins for memory access and could work up to 1MHz. It is probably the case for your HP-71B 2CDCC, ser# 2852A00xxx (1988).

I'm not sure if an original 1LF2 CPU accelerated at ~800-900kHz would work as well with your FRAM71.

I once wrote a small utility to identify the processor type by software without opening the HP-71B.
See here: thread-1224-post-133336
A binary ready for download with the PIL-Box can be found in the following posts.

J-F
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RE: FRAM71B and overclocked HP-71B - J-F Garnier - 02-25-2024 10:32 AM



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