Re: Monitor pet 8032 on commodore educator 64

From: Rob Clarke <crock_at_clarke-family.org.uk>
Date: Sat, 4 Jan 2020 18:01:07 +0100
Message-ID: <6769d026-23e9-a38f-c4a7-bd39238428a0_at_clarke-family.org.uk>
Yes you can, but you need one of these:

http://inchocks.co.uk/commodore/4064/4064_VideoBoard.JPG

The is the one in a PET 4064, which is similar to an Educator64, but 
uses a standard PET monitor. The video board takes the luma signal from 
the 64 and splits it into the h-ysnc, v-sync, and video signal expected 
by the PET monitor, but anything other than black is shown as green, so 
you will only get true monochrome images such as these:

http://inchocks.co.uk/commodore/4064/4064_BoulderDash.JPG

AFAIK, no-one has found or reverse engineered a schematic yet.

regards,

Rob

On 04/01/2020 11:54, David Roberts wrote:
> What Frank says.
>
> Dave
>
> On Sat, 4 Jan 2020 at 09:26, Francesco Messineo 
> <francesco.messineo_at_gmail.com <mailto:francesco.messineo_at_gmail.com>> 
> wrote:
>
>     On Sat, Jan 4, 2020 at 9:50 AM Steff <alienzone_at_gmail.com
>     <mailto:alienzone_at_gmail.com>> wrote:
>     >
>     > Hi, i've a commodore educator 64 with no monitor, I've found a
>     pet 8032
>     > monitor that look like the educator one but have different video
>     signals.
>     > So, is there a way to make this monitor work with educator (that
>     is a
>     > commodore 64)? Can i found an interface or schematics to build
>     one for do
>     > this job? Thanks in advance..
>
>
>     Short answer: no
>     Longer answer: the 8032 monitor works at a very different horizontal
>     scan rate, it should be around 20 KHz afair. Also I think the
>     horizontal and vertical syncs have a particular duty cycle to allow
>     the monitor circuitry to use less components.
>     Also, video signal and both sync signals have TTL levels and have
>     separate pins.
>     A C64 on the other hand has a standard NTSC or PAL video composite (or
>     monochrome) output (at analog levels).
>     I'm sure something can be made to adapt this signal to work on a 8032
>     monitor but I would not attempt that myself anyway.
>     It would be easier to adapt an old CRT TV set.
>
>     Frank IZ8DWF
>
Received on 2020-05-30 00:08:58

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