Project:Infotec displays

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Revision as of 12:09, 7 November 2011 by Artag (talk | contribs) (→‎Status)
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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.

Update : we can send the time to it via the serial port, but don't yet know how to format the other commands.

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/.

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