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Looking for info on the internal workings of the 41's IR printer module
05-07-2016, 05:53 AM (This post was last modified: 05-07-2016 05:56 AM by Hans Brueggemann.)
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RE: Looking for info on the internal workings of the 41's IR printer module
in some ancient FW versions of FRAM71, i had the IR printer hardware layer implemented to calculate the error-correction bits and the data framing in hardware.
what i can say for sure is that the HP-41C doesn't drive the IR LED directly. the LED is driven by the module hardware. also, the module contains a 32.768 kHz XTAL as a timebase for the data frames.
   


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RE: Looking for info on the internal workings of the 41's IR printer module - Hans Brueggemann - 05-07-2016 05:53 AM



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