VT101 8085 CPU Fault

Diane Bruce db at db.net
Sun Jan 18 16:04:30 CST 2015

On Sun, Jan 18, 2015 at 09:47:35PM -0000, Robert Jarratt wrote:
> > you more. Nice sharp edges to signals when they shift. Times that look
> > reasonable... Steady levels, and correct levels.
> It will never be steady with a scope because the address lines won't be a regular waveform. That said they looked very different on the faulty board to how they looked on the good board.

A remote possibility is the boot ROM is b0rked and it's simply running
around like a chicken without a head.
That is something a good logic analyser could tell you.

- db at FreeBSD.org db at db.net http://www.db.net/~db

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