Hi all,

If anyone is interested the emulator for HP calculators has been upgraded.

It now does models for HP35, 45, 55, 65, 67, 70, 80, 21, 22, 25, 27 and 29C=
..

The emulation of the HP67 was quite complex because its card reader is
controlled by the calculators own microcode. It also has more memory
and the PIC was changed to a 16F1519 to cope.

The circuit board as presented previously still works, however the 29C
was one of the first with CMOS chips. HP took advantage of the low
power requirements, as the power switch didn't actually turn the
calculator off and the calculator could "remember" the stored program
and the state it was in. The display was turned off, but the code
still executed in a different loop. A new PCB will be available soon
to enable this feature.

The free downloads are at www.teenix.org

cheers

Tony
--=20
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