19 Jan
2015
19 Jan
'15
2:12 p.m.
-----Original Message-----
From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of John
Wilson
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:
clock,
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
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.
Quite. That or a logic analyser.
Regards
Rob