VT101 8085 CPU Fault

John Wilson wilson at dbit.com
Mon Jan 19 15:39:30 CST 2015

On Mon, Jan 19, 2015 at 09:26:57PM -0000, Robert Jarratt wrote:
>In my latest tests I found that the CPU does indeed seem to HALT,
>according to S1 and S0 (both go low).

What ever happened to in-circuit emulators?  I used an 8085A ICE in
a microprocessors class at Boston U. in the 1980s and it was *magic*.
I always wondered how they worked -- is it just an 8085A with a doctored
clock, or some complete re-implementation of it, or what?  Physically
it was a 40-pin DIP plug with a thick cable leading off to a mass of
electronics.  It's just the kind of thing that would turn up on eBay,
but only if you didn't need it.

John Wilson
D Bit

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