HP97 The journey begins

[teenix]

(10-12-2024 06:26 PM)brouhaha Wrote:  The 95C apparently having more than 256 programmable operations has been nagging at me. I woke up in the middle of the night with a possible solution. The key observation is that it is exactly 256 plus 10, suggesting that something with a zero to nine operand is extraneous.

Hypothesis:
GTO 0-9 is encoded internally as JUMP <current program> 0-9

Nice idea. I did some more manual reading, and it has something similar.

"If you are keying in instructions in program A and try to key in, say g JMP A2, the instruction that is actually keyed in will be GTO 2 (keycode 63 2), since that is actually the instruction you are trying to load."

This would suggest that GTO 2 is valid and g JMP A2 is valid but only from programs B-D, so both are separate step codes.

Also, GTO 0- 9 and JPn 0 - 9 have individual printouts, same for the key combinations on the display.

It would appear that perhaps the manual is not 100% correct. I'm still wondering if LBL's 0 - 7 are only supported.

There is supposed to be a 95C or two floating around, probably locked up in Fort Knox, firing one up and having a play would be the only real solution.

On re-reading the manual, the operational delay I mentioned was for deleting a long program, not so much wrapped up in 9th bit processing as I guessed. I suppose the software has to call a [Delete Step] subroutine in a loop that has to shift multiple steps backward many times and keep the other programs in tact.

It's amazing (and frustrating at times) how the brain keeps working on a problem while unconscious :-)

cheers

Tony