VT101 8085 CPU Fault

Robert Jarratt robert.jarratt at ntlworld.com
Mon Jan 19 16:12:27 CST 2015

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of John
> Sent: 19 January 2015 21:40
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: VT101 8085 CPU Fault
> 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
> or some complete re-implementation of it, or what?  Physically it was a
> 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.

Quite. That or a logic analyser.



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