TRS-80 Model 1 Monitor

Robert Jarratt robert.jarratt at
Thu Apr 9 00:58:34 CDT 2015

> -----Original Message-----
> From: cctalk [mailto:cctalk-bounces at] On Behalf Of tony
> Sent: 09 April 2015 05:58
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: RE: TRS-80 Model 1 Monitor
> > I have finally managed to get my hands on a TRS-80 Model 1. Trouble
> > is, it came without a monitor. I have been doing some searching to see
> > if I can find out what kind of monitor it is and I am left unsure. All
> > I have found so far is a statement which says it is a TV without a
> > tuner. I am not sure what that means. I still have a CRT TV, can that
> > be made to work, or have I bought something that I can't use?
> Did you get the PSU brick? That is a little harder (but only a little) to

Yes, I did.

> The TRS-80 M1 drives a normal [1] composite video monitor. The original
> was an RCA portable TV that had had the tuner, etc, removed, but there is
> reason why you have to use that. I am sure you have something that will
> [1] OK, US scan rates. 15770Hz horizontal, 60Hz vertical. But I've yet to
find a
> composite monochrome monitor that can't be tweaked to do both US and
> European rates.
> The only trick is the video output connector on the M1. It's a 5 pin DIN
> The connections are :
> 1 :  +5V
> 4 :  Composite video
> 2 ;  N/C
> 5 : Ground
> 3 : N/C

I have just noticed that it came with a little box with a cable with a DIN
connector on one side and a cable with a coax plug for TV aerials on the
other. It is unmarked and looks a bit "custom". Inside there is a UHF
modulator. So it looks like someone made an RF modulator to allow it to work
with an ordinary analog TV.



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