Posts: 2,309
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Joined: Jun 2005
Quote:
I guess that by using specific control routines (MCODE) one could mannage to have the IR module to send a set of characters that would normally not be sent with regular printing protocol.
I don't think MCODE will let you send anything that you couldn't already send using synthetics, ATOX, or ACCHR.
Other than that, you're right. There is apparently a microcontroller inside the 82242A which accepts printer bytes from the 41 bus, and generates the IR modulation pattern. There's no obvious way to make it use any modulation scheme other than the Redeye protocol.
Quote:
Somehow off-topic: based on the HP41 behavior after having an IR module connected to it, I believe it is more related to the HPIL structuire than to the original HP82143A peripheral printer.
Based on a *very* limited look at some disassembled code from the module, I think you're right.