Looking for EPROM 2708 help
dkelvey at hotmail.com
Wed Dec 29 12:14:49 CST 2010
Until someone can get your 2708, you might just program
a more current EPROM and make a socket adapter.
I always have a number of 32/28/24 machine pin
sockets around in case I need to read some mask ROM
with funny selects.
I just wire up whatever is needed at the time.
> Date: Wed, 29 Dec 2010 09:51:11 -0600
> From: trebor77 at execpc.com
> To: cctalk at classiccmp.org
> Subject: Re: Looking for EPROM 2708 help
> I still want to get the N* with Monitor working. I was able to get my
> BYT-8 working with the N* CPU; My Bus Probe and an IMS SIO-2 card that
> was originally in the N*. I had to replace the Address Jumper Plug with
> a Dip Switch and the Monitor recognizes it. The Code executes exactly
> the same as the N*. So if I can get a new Prom with my Changes burnt it
> might help me to Diagnose the Problem, I was able to add the DATA IN
> Buss lines to the Bus Probe so now I can see the results of the IN 3 and
> IN 2 calls. I still want to add a OUT 2 after each IN 3 so my 232
> Analyzer can display the Results for me to help confirm what I am
> seeing. I get good results from Single Stepping but if I "RUN" the Bus
> probe the Output to the Analyzer looks like it is getting Multiple
> Results from each execution of OUT's & IN's. Got to find a way to put a
> Slow Stepper circuit somewhere on one of my Cards. I've got a MOD to the
> IMSAI F/P but I'll have to figure out how to implement it Separately.
> Bob in WI
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