Project:Infotec displays
From London Hackspace Wiki
Donated by Nottinghack, who have a project page with pictures. Further information posted by NortHACKton and Leeds.
Status
The screen on one side has been damaged and a roughyl 10x10 pixel area is dead.
Works fine apart from that.
We need to work out how to talk to it.
Hardware
Photos by Akki
Notes
Mark has done some work on the dumped rom, includeing extracting the fonts[1]:
https://github.com/marksteward/Infotec/
Turning on DIP switch 8 and cycling power puts the clock in a display test mode.
Firmware
NEC 27 (25), which is almost identical to a 186, with register bank switching, DMA and a simple buffering (macro) system for interrupts. User manual and with opcodes and with chart.
| External bus | 8-bit |
| Clock speed | 8MHz? |
| DMA channels | 2 |
| Serial | built-in |
| Timers | 2 |
| Internal data area | 256 bytes based at xxe00 |
| Special functions | 256 bytes based at xxf00 |
Disassembly at http://github.com/marksteward/Infotec/.
