Re: Making a colour IIc 9" monitor from Mac Color Classic

[mjmahon@aol.com (Michael J. Mahon)]

Eric Smith wrote:

>"Tim Haynes" <timhaynes@alumni.NO.SPAM.PLEASE.uwaterloo.ca> writes:
>> I just picked up a Mac Color Classic today which appears to be dead except
>> for the CRT.  I see that it has a 9" viewable region, much like a IIc's
>> monitor.  Any hope of me replacing the IIc's mono CRT with the Color
>> Classic's CRT to yield a colour IIc monitor,
>
>No.
>
>> or are the
>> electronics/frequencies hopeless different?
>
>Yes.
>
>The high voltage supply of the monochrome monitor doesn't generate
>a high enough second anode voltage for the color tube.  And you can't
>use the HV supply from the Mac Color Classic because it depends on
>a higher vertical scan rate than the IIc produces.

Just a nit--it's the _horizontal_ scan frequency that the HV supply
depends upon.  ;-)

>It's one of those things that's theoretically possible if you do enough
>work and buy enough parts, but it will take a *lot* of time and cost
>more than buying yourself a suitable color monitor.

Absolutely.  Think of "converting" a monochrome TV to a color TV
and you've got the right idea.

-michael

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