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HP-25 resurrection adventure – Part 1: The Keyboard
09-22-2021, 03:44 PM
Post: #6
RE: HP-25 resurrection adventure – Part 1: The Keyboard
"display goes dark for about 0.5s and then shows "0.000000000"."

I had this identical behavior on one of my 25s after the Panamatik ACT-E conversion. The 'external' 25 ROM gives the behavior you described. The 'internal' ROM (on the Panamatik chip) works perfectly. It's the ACT chip. Put the new ACT-E in. If you get this behavior, hold down EEX while switching on. This toggles between internal and external ROM.

Regards,

Dave
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RE: HP-25 resurrection adventure – Part 1: The Keyboard - Dreato - 09-22-2021 03:44 PM



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