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Author Topic: HD637B01V0 - ripping stored program?  (Read 773 times)

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Offline metertech58761Topic starter

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HD637B01V0 - ripping stored program?
« on: October 22, 2025, 01:18:41 pm »
So I have a board with this MPU (HD637B01V0) and I'd like to know -

1) Is it possible to download a stored program from this device? I don't see anything about chip security in the datasheet.

2) Which programmer can I use? I have a GQ-4X4 (I think) and a TL-866II+, and have access to a BP Micro unit.
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Offline squadchannel

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Re: HD637B01V0 - ripping stored program?
« Reply #1 on: October 22, 2025, 01:30:37 pm »
It wouldn't be readable if it were a mask ROM, but it doesn't seem to be one.

As noted in the datasheet, it can be read with the same settings as a 27C256.
connect it to the programmer using a breadboard.
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Offline metertech58761Topic starter

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Re: HD637B01V0 - ripping stored program?
« Reply #2 on: October 22, 2025, 02:43:03 pm »
Thank you! Looks like I've got work to do. :)
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Offline metertech58761Topic starter

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Re: HD637B01V0 - ripping stored program?
« Reply #3 on: November 06, 2025, 04:09:31 pm »
After mulling it over, for a variety of reasons, I drew up Gerber files to have an adapter PCB made up, and which follows.
Gerber file also includes an 'app note' about the resulting data dump.
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Offline metertech58761Topic starter

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Re: HD637B01V0 - ripping stored program?
« Reply #4 on: November 13, 2025, 03:44:30 pm »
And to close this out, I built one adapter and just completed two successful rips!
« Last Edit: April 21, 2026, 05:50:31 pm by metertech58761 »
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