On my system, the video board is one of the large ones. It is in the furthest back slot. There are two large PROMs on it for the character generator. There were two boards available. One was text only and the other had graphics support. Your system may be different. Check the wiring...
I am attempting to get my first computer running again and will post some videos along the way. It has been in storage and after I pulled out two IBMs, I thought I would try to get this system running. A little info on this computer can be found here...
Pictures of an old opto-isolated driver board I made for the PC in the early 80s used for some automated testing. Some of you may know what that heatsink came from.
After seeing the 8088MPH demo, decided to pull out my old IBM PC and watch it for real. The video shows the insides of my IBM PC with Z80 board.
https://www.youtube.com/watch?v=SbYcjrezJHs
My PC running the 8088MPH demo.
https://www.youtube.com/watch?v=-QooSmcknY4
My PC connected to a...