HP97 The journey begins
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10-21-2021, 07:46 AM
Post: #464
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RE: HP97 The journey begins
Hi all,
I've been trying to dissect the sense chip for some time now, and have been making some progress. The HP Journal mentions it as a Large Scale Integrated (LSI) circuit, which is a bit dauting as it probably means lots and lots of transistors were used to make it do its job. I'm pretty sure it is not a digital chip, it is most likely all analog with some level shifting to interface to the PMOS CRC chip. I am about to try and put a circuit together to mimic the card read/write which will take a bit of time and fiddling but I can use one of my CPU boards and one of the new blank sense cards that I have as a programmable test bed. I just have to be very careful that I don't fry the head cheers Tony |
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