Tandy CM-8 monitor specs?
Mitchell Spector
my CoCo 3, though before I rush out and buy it, could someone
tell me the technical specifications for this display?
I believe it is an analog RGB monitor (it should be as it
plugs directly into the 9-pin connector underneath the CoCo3)
but I'm wondering what its dot-pitch is and what resolutions
it supports. Also, what kind of picture sharpness and color
quality does it have?
Mitchell Spector
sp...@vax2.concordia.ca
Marc Fury
You might want to ask in the bit.listserv.coco NewsGroup.
They would probabley be able to answer your question really well.
That is if someone hasn't answered it yet.
Mitchell Spector (sp...@vax2.concordia.ca) wrote:
: I have the opportunity to get a Tandy CM-8 RGB monitor for
--
Marc Fury, Cybernaut at Delta College Univ Center, Michigan
When I surf the net, my wife Brenda rides the board also
E-Mail address: mf...@alpha.delta.edu Web Site: http://www.delta.edu/~mfury
In CyberSpace, no one can hear you scream....
Michael Shell
Mitchell Spector <sp...@vax2.concordia.ca> wrote:
: I have the opportunity to get a Tandy CM-8 RGB monitor for
:my CoCo 3, though before I rush out and buy it, could someone
:tell me the technical specifications for this display?
:
: I believe it is an analog RGB monitor (it should be as it
:plugs directly into the 9-pin connector underneath the CoCo3)
:but I'm wondering what its dot-pitch is and what resolutions
:it supports. Also, what kind of picture sharpness and color
:quality does it have?
:
:Mitchell Spector
:sp...@vax2.concordia.ca
Here's some stuff from the service manual:
Horiz res. 480 dots
Vert res. 225 lines
Horiz freq: 15.701 Khz (-400 to +300 Hz)
Vert freq: 59.7Hz
Screen Pitch: 0.52mm
*****
It is by no means an SVGA monitor. However, if you have been using
a TV all these years, the CM-8 will put you in COCO heaven!
My only objection to it is that the dot pitch is a bit large (even for
a Coco 3). However, the 80col text will allow you to see one line
"one line" at a time! The graphics are sharp and clear too!
If the unit is < $50 and in good shape, go for it!
Michael Shell
--
Mike Shell
gt1...@prism.gatech.edu
the TyRannoSaurus
Michael Shell <gt1...@prism.gatech.edu> wrote in article
<756d6j$f...@acmex.gatech.edu>...
> In article <14DEC199...@vax2.concordia.ca>,
> Mitchell Spector <sp...@vax2.concordia.ca> wrote:
> : I have the opportunity to get a Tandy CM-8 RGB monitor for
> :my CoCo 3, though before I rush out and buy it, could someone
> :tell me the technical specifications for this display?
Don't shoot me, but I've never seen a Coco 3. It was never exported to
Europe. Maybe Matra in France made their own design, as they did with the
coco 2... Anyway, I have some questions.
> : I believe it is an analog RGB monitor (it should be as it
> :plugs directly into the 9-pin connector underneath the CoCo3)
An analog monitor with a db-9 connector ? Or is it a non-standard connector
?
> Here's some stuff from the service manual:
> Horiz res. 480 dots
> Vert res. 225 lines
> Horiz freq: 15.701 Khz (-400 to +300 Hz)
> Vert freq: 59.7Hz
Excuse me, but that seems like a CGA-frequency to me. Couldn't you plug a
CGA-monitor to it ?
Right, but CGA is RGBI-TTL, that's digital, isn't it ?
> Screen Pitch: 0.52mm
>
> It is by no means an SVGA monitor.
Couldn't you connect an old Nec II (stepless scanning for both analog and
digital signals) to it ?
> However, if you have been using
> a TV all these years, the CM-8 will put you in COCO heaven!
Odd, I've never seen an analog monitor with such specs. Are they rare ?
And if you don't have one for you coco 3, what do you use instead ? (Nec II
?) Is a TV the only alternative ?
> Michael Shell
Greetings from the TyRannoSaurus
Jan-80
Michael Black
close together. I thought it was ten pins (I can't easily check mine),
but one is removed as a key. It's not a DB-type connector.
15KHz horizontal and 60Hz vertical is the same as used in televisions in
North America. It was an almost absolute standard for monitors until
the IBM PC came along and started using non-standard frequencies. It may
be hard to find them now, but any color monitor old enough would match
the frequencies.
The frquencies are the same as used in CGA monitors, which isn't a
surprise since when the CGA board was instroduced they were standard
frequencies in North America. But the CoCo III has analog output, and
as you mention, CGA is digital.
I found an RGB monitor of suitable frequencies in the garbage a few years
back. It had BNC connectors on it, and I was tempted to just take those.
But I decided to bring the thing home in case the monitor had been
discarded not because of a defect but because it used sync frequencies
that were no longer common. It works fine.
I bought an Amiga 500 last spring with a Commodore color monitor for ten
dollars at a Rotary Club garage sale. The monitor works fine, the Amiga
has something wrong with it, wich is ironic because I wanted the Amiga not
eh monitor, and as I struggled to get the bus stop with the stuff, I was
tempted to abondon the monitor. I think it's a 1084; it is a common
monitor and has composite input (it works great with a VCR) as well as
RGB input.
I think the problem of finding a suitable monitor for the CoCo isn't
that they were uncommon, but finding them at this point.
Michael
bma...@iglou.com
>> Horiz freq: 15.701 Khz (-400 to +300 Hz)
>> Vert freq: 59.7Hz
>Excuse me, but that seems like a CGA-frequency to me. Couldn't you
>plug a CGA-monitor to it ?
>Right, but CGA is RGBI-TTL, that's digital, isn't it ?
Early CGA cards had digital and composite video outputs so you could
plug in an RF modulator and use a TV set as a monitor (in 40 column mode).
>Odd, I've never seen an analog monitor with such specs. Are they
>rare ?
Net-Tamer V 1.08X - Test Drive
Mitchell Spector
>On 1998-12-17 Ja...@ping.be.nospamplease said:
>
> >> Horiz freq: 15.701 Khz (-400 to +300 Hz)
> >> Vert freq: 59.7Hz
> >
> >Odd, I've never seen an analog monitor with such specs. Are they
> >rare ?
>
>The Atari ST and Amiga computers used analog RGB monitors at NTSC scan rates.
It's worth noting the Apple IIgs (from the same era as the Amiga
and ST) also output an analog RGB signal at NTSC scanning frequency.
Assuming you can find the standard monitor sold with it, it should
work just fine on the Atari ST, Amiga and CoCo 3.
It has a really dark tinted screen and above average color too.
I have a few spares hanging around so one of these days I might try
hooking one up to my CoCo 3 (already built a cable to get it hooked
up to a SuperNintendo which can output analog RGB).
Mitchell Spector
sp...@vax2.concordia.ca