ard at p850ug1.demon.co.uk
Sat Jan 16 12:21:02 CST 2010
> I just got from our scrap pile=2C a Abi ROM emulator. I got no instruction
> manual but it looks like I can download a current release from the web.
> I've not used one of these before but this looks like a great debug
> tool since one could create small programs to run specific debug test
> and stick it into systems without blowing EPROM ( always a drag ).
An EPROM emuloetor is certainly a very useful thing to have. I built one 
some 21 years ago (actually a combined emulator/programmer) and have used
it a lot. As you said, it sure beats burning an EPROM time and again.
 3 boards of TTL logic, RAM, and a dumb UART. A microcontroller would
have made life a lot easier, but how the heck could I program the
firmware ROM for that without a programmer :-).
> I've always though it would be great to have one but never could
> justify the several hundred bucks to buy one.
There have been sevearl designs in magazines ove the years. My favourite
was in Elektor, it was just RAM and a handful of TTL parts. It was loaded
from a Centronics printer port,
> The one thing I wonder about is that the company is still selling this
> unit as an ISA board interface. I'm surprised they haven't come up to
> PCI or USB. I'm sure there is a larger market for an inexpensive USB
I've seen plenty of them with RS232 or Centronics host interfaces. I
assume they can be used with the appropriate USB converter cable, but for
obvious reasons I've not tried.
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