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HP 48SX/GX display output for overhead projectors
07-01-2017, 06:53 AM
Post: #1
HP 48SX/GX display output for overhead projectors
I recently picked up an Invision 48, which was something you plugged into an HP 48SX/GX card slot for classroom overhead projection.

I was wondering if anyone knew of detailed information of the card connector signals used for outputting the display. I've been able to find pinout information at and general chip information at which lets me at least know what the upper clock speed limits are for XSCL.

However, what I don't know are:
  • What's the actual clock rate of the XSCL pin?
  • How many pixels are output on LD[0] and LD[1] between each LP pulse?
  • What the allowed voltage ranges are (I have some guesses)?
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