HP-19C Repair Odysee

[PANAMATIK]

(07-06-2021 08:00 AM)teenix Wrote:  Both my 19C and 67 emulators running standard Microcode don't show a PIK HOME? instruction getting executed on start up or during the key wait loop, only - Is there a key press available? - PIK1320.

Hi Tony,

You are right. I checked again my interpretation of the HP-19C code. And indeed the HP-19C does use the pik home? 1120 and pik cr? 1220 instructions at startup only if "Continuous Memory" is corrupted and "Error" shall be printed. Therefore an automatic PIK induced "MovetoHome" at power up is also performed, which is not triggered by software. This escaped my attention.

Then at the moment only the PIK is confirmed to work. ACT could be damaged.

Bernhard