Sounds like an ambitious project ;-) You can send the display data out to a display via the com port and, if you need the port for something else, even the bar code port; there is also a terminal driver that is compatible with the M100's screen codes. Have a look here:
https://bitchin100.com/wiki/index.php?title=VT100 On Wed, Nov 8, 2023 at 9:31 PM Scott McDonnell <mcdonnell.j...@comcast.net> wrote: > I ended up with a small qty of 10.4" monochrome LCDs and was asking around > for ideas what to do with them. In one of my other groups, it was suggested > to get one working as a display for a model 100 and I thought that was a > great idea. Probably the most compatible way to do this would be to emulate > how the DVI worked, but I have never seen one in action. I have also gotten > confused looking up youtube demonstrations. In some, the DVI plugs into the > 40 pin expansion socket on the bottom. In another video, it was plugged > into the parallel port, I think. The 40 pin expansion makes more sense to > me. > > Looking through the service manual, it appears to use a 8255 PPI to > interface with the computer to write into VRAM and ARAM which a CRT > controller then uses to paint the screen on a monitor. Is that a simple > description of how it works? It appears to require loading a driver program > and is not something that is just available in the BIOS, right? Would it > work with all screen output, even graphics, etc? If so, maybe compatibility > is not really an issue with my own driver? > > So I am looking for links and info to help me on this quest. The service > manual is great, but it is geared more toward repair than theory of > operation. Is anyone aware of any reverse engineering information on this? > Has anyone attempted to duplicate it before? > > These displays are controller-less, so of course first I need to design a > controller for them. I was planning to just use a Raspberry Pi Pico to > drive it. > > Here is a really good project with tons of information on driving my exact > display for those curious which display it is. The display is nearly > exactly the size of the Model 100, so making an enclosure that could flip > down like a laptop would be possible. > > http://www.projekte.daleske.de/mcp/49_LCDM/LCDM.htm > >
