HP-48GX cards other than RM/ROM?
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10-28-2023, 04:05 AM
Post: #5
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RE: HP-48GX cards other than RM/ROM?
(10-27-2023 07:25 PM)Jeff_Birt Wrote: I dug out my HP-48s to play with and got to wondering if there were every any other types of expansion cards made for the GX other than RAM/ROM. The Port 2 connector has some signals related to the LCD and I watched a video at lunch today of HHC 2018 that talked about the 50G LCD projector connector which insinuated that the 'something' might be done with these signals on the 48. Bizarrely, HP did not provide a vertical (frame) sync signal. There was a kludge to detect frame sync by the state of a bit in a scan line outside the visible area, but that was not rntirely reliable, so the displays that were sold also had buttons for manually adjusting the vertical sync. |
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Messages In This Thread |
HP-48GX cards other than RM/ROM? - Jeff_Birt - 10-27-2023, 07:25 PM
RE: HP-48GX cards other than RM/ROM? - Eric Rechlin - 10-27-2023, 07:36 PM
RE: HP-48GX cards other than RM/ROM? - Jeff_Birt - 10-27-2023, 08:03 PM
RE: HP-48GX cards other than RM/ROM? - Eric Rechlin - 10-28-2023, 12:39 AM
RE: HP-48GX cards other than RM/ROM? - brouhaha - 10-28-2023 04:05 AM
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