HP97 The journey begins

[teenix]

Hi all,

I uploaded the emulator at teenix.org and the 67 now supports the extended Continuous memory.

The 67 is still running original Microcode, but you can swap RAM and PGM banks individually, STO RCL to and from different RAM banks, and jump to any label in any PGM bank. You can execute the mods either in Run mode normally or when a program is running. In W/PRGM mode, the key codes are stored in normal HP-67 memory and can be used with the emulator cards with no modification.

On power up, all memory is retained as well as the X register, display formatting and selected deg/rad/grd setting.

It may have a bug that I missed, but time will tell.

Here is a code example to jump to LBL E in PGM Bank 3 and from there load register R0 from RAM Bank 2 into X. First, data is loaded in X and the key sequence [h][E] executes the command. The key sequence [h][E] is stored as 1 program step.

7 ; swap to PGM bank 3
4 ; jump to LBL E
h
E ; execute


PGM Bank 3

LBL E
9 ; RCL
2 ; from RAM bank 2
0 ; Register R0
h
E ; Execute

These type of key sequences can be keyed in directly as well.

This idea should port to the 67 and 97 CPU boards reasonably easy by using the emulator as a template, which I'll start soon. It looks like Covid shutdown is being extended another week so at least I have some idle time.

The 97 CPU replacement board has had a set back as the PCB design had an unknown design flaw and some components did not line up properly and had to be scrapped. This turned out to be a rather expensive mistake :-(

cheers

Tony