LCD Screen Output (HP-49, 110+)
|
12-08-2014, 10:35 AM
(This post was last modified: 12-08-2014 10:36 AM by Martin Hepperle.)
Post: #7
|
|||
|
|||
RE: LCD Screen Output (HP-49, 110+)
(12-05-2014 11:22 PM)BruceH Wrote: It doesn't have to be any faster than the screen refresh rate of the built-in LCD - which isn't the fastest thing in the world, for the 39/49 at least. An RPi would do the job.That's how I understand how the system works: The screen refresh rate is about 50Hz, but the pixels are sent out as several serial streams - one for each quadrant of the screen (Portable: dot clock <= 1.25 MHz). They would have to be captured, combined and stored in a RAM and then, after a frame is complete, one would have to output the frame according to the external display needs, e.g. scan line by scan line. Therefore I think one has to capture the data at a relatively high rate. In case of the HP-49G the screen is split into two halves, so that only two pixel streams have to be captured. It would be a nice project to hook up modern TFT screens to these machines. Martin |
|||
« Next Oldest | Next Newest »
|
Messages In This Thread |
LCD Screen Output (HP-49, 110+) - Martin Hepperle - 12-05-2014, 02:25 PM
RE: LCD Screen Output (HP-49, 110+) - Dave Frederickson - 12-05-2014, 02:31 PM
RE: LCD Screen Output (HP-49, 110+) - Martin Hepperle - 12-05-2014, 04:44 PM
RE: LCD Screen Output (HP-49, 110+) - Dave Frederickson - 12-05-2014, 09:51 PM
RE: LCD Screen Output (HP-49, 110+) - Martin Hepperle - 12-08-2014, 10:26 AM
RE: LCD Screen Output (HP-49, 110+) - Dave Frederickson - 12-09-2014, 02:47 AM
RE: LCD Screen Output (HP-49, 110+) - BruceH - 12-05-2014, 11:22 PM
RE: LCD Screen Output (HP-49, 110+) - Martin Hepperle - 12-08-2014 10:35 AM
|
User(s) browsing this thread: 1 Guest(s)