Calculators with Support of the 82240 IR-Printer

[Martin Hepperle]

In the meantime I have tested my code with a HP 48G and the WP 34S and the results are as expected. For further tests I used a HP 28S and found the IR-transmission relatively buggy (incomplete data frames, bit errors).

Does anyone have experience with the HP 28S and IR-printing and knows whether there is a known timing problem with the HP 28S? Is the 28 known to be more finicky w.r.t. printing? I have not looked at the signal with an oscilloscope yet.

Maybe the reason may also be that I still use a 38 kHz IR-receiver - I will replace it with a 33 kHz one soon to see whether this makes a difference.

In the end I would like to dump the ROM of the 28S via IR so that I can use it in EMU28.

Martin