(71B) FORTH questions

[J-F Garnier]

(06-16-2023 05:39 PM)Giuseppe Donnini Wrote:  Although I am not a regular HP-71B user, I have studied its clock system in great detail ...
I can, therefore, confirm that the bug was indeed fixed in ROM revision 2CDCC. Here is my own disassembly of GETTIM for both the 1BBBB and the 2CDCC revisions.

Good catch!
Indeed, the P= 5 instruction was at the wrong place !
This means the double read check was ineffective most of the time, mostly forcing a third read that was potentially wrong.
This was very likely the cause of the bug.

(06-16-2023 05:27 PM)floppy Wrote:  Thanks. Is anywhere an assembler list of the "CLOCK" word of the translator module? Could be a point where to start.

I've very little knowledge of the translator module (I can't know everything about the 71B ...) so didn't know about the CLOCK word.
Indeed, a disassembly may give you useful information.

J-F