[Coco] CM-2 260-3212 color monitor with coco 3?

[Dave Philipsen]

Unless you use some kind of comparator circuit that could trigger the 
intensity input to the monitor...just a thought.  Of course if you're 
gonna do that you might as well just hack the monitor and get into the 
analog circuitry that drives the color guns, eh?  :)

Dave


On 2015-09-19 18:26, Arthur Flexser wrote:
> I think you'd get only 8 colors if you interfaced a CM-2 to a CoCo 3.
> The R, G, and B would be either on or off, no in-between, no?
> 
> Art
> 
> On Sat, Sep 19, 2015 at 5:44 PM, Barry Nelson <
> barry.nelson at amobiledevice.com> wrote:
> 
>> According to what I have found the CM-2 appears to use an RGBI 
>> interface
>> as opposed to the CoCo 3's analog RGB. RGBI is limited to 16 colors 
>> and the
>> signal level is TTL 0 or 5 volts digital. The CoCo 3's RGB line 
>> signals are
>> 0 to .7 volts analog. You could construct a circuit to interface the 
>> two,
>> but the CoCo 3 can display 64 colors and that monitor can only display 
>> 16.
>> I suggest using another solution like my CoCo 3 to HDMI adapter cable 
>> to
>> display on a modern display in full color. I am including the CM-2 
>> pinout
>> below.
>> 
>> Pin     Name    Description
>> 1       GND     Ground
>> 2       GND     Ground
>> 3       R       Red
>> 4       G       Green
>> 5       B       Blue
>> 6       I       Intensity
>> 7       RES     Reserved
>> 8       HSYNC   Horizontal Sync
>> 9       VSYNC   Vertical Sync
>> 
>> 
>> > Walter Miraglia walter.miraglia at gmail.com
>> > Just wondering.  I recently acquired a Tandy 1200 HD which came with a
>> CM-2 colour monitor and I am wondering, if I make the appropriate 
>> cable,
>> will this monitor work with my COCO3?
>> >
>> > The monitor is at my brother in law's place about 5.5 hour drive away...
>> So wondering if it's worth the drive or if it can wait until 
>> thanksgiving
>> in October. (Canadian here eh!)
>> >
>> > Cheers!
>> 
>> 
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