trs-80 model II trouble--problem solved..and follow-up

Dave McGuire mcguire at
Wed Dec 16 08:36:31 CST 2009

On Dec 16, 2009, at 9:10 AM, Bob Brown wrote:
> Thanks to everyone's advice.  You were all right (as was my original
> suspicion)...that it was the video memory.
> Thanks to the pointers on where the video memory was (I don't have
> schematics or other tech info on this system).
> I was able to find the bad memory...and, amazingly, I found that I had
> another 2114 that I could put in (I took it out of my heathkit
> microprocessor-trainer.  And it makes the trs-80 work much betta!

   Excellent.  Good job!

> So...a couple of questions:
> 1)	How can I get just 1 2114 that works to replace the one I took
> out of my heathkit? (the place that people pointed-out for buying  
> chips
> has a $25 minimum..and I don't need that many chips).

   There's always eBay..

> 2)	What can I do with a model II now?  When it is booted into CP/M,
> will it only run CPM stuff specifically for the trs-80 or will it run
> any CP/M stuff that is on 8" floppy?

   Most any CP/M software.  That's the whole point of CP/M.

> 3)	Where can I get some disks with interesting goodies to run on
> the model II?  (most of the disks that I have with it have some office
> software and backups of some data...not too much of interest).

   Can't help you there..


Dave McGuire
Port Charlotte, FL

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