Repair of a NASCOM 1 computer

Описание к видео Repair of a NASCOM 1 computer

Using a 'scope and a special test ROM to debug and repair a NASCOM 1 Z80-based British computer from 1977. Final step in the video is to write a tiny code loop and single-step the code.
(NASCOM was rare in having hardware support for single-step)
On a genuine NAS-SYS 3 monitor, the error message is "Error" and not the "ERROR" shown here; I haven't checked for other mods..
Test ROM: https://github.com/nealcrook/nascom/blob/m...
Verilog simulation/waveforms of VDU operation: https://github.com/nealcrook/nascom/tree/m...

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