Re: My ColourPET Project

From: Christian Dirks <>
Date: Thu, 09 May 2013 00:36:12 +0200
Message-ID: <>
Hi Steve,
I took a look at your new schematics. You use a 74LS04 to invert the 
signals. Just one suggestion:
A inverter for the sync signals is already present on the mainboard 
(UC2, jumper 2+3), but since there is no inverter for the video signal, 
I also installed inverters to my prototype board. Instead of a 04 I used 
a 86 with jumpers in the way commodore used it  to invert the signals. 
This is more flexible since it allows to switch polarity depending on 
what monitor is used.


Am 08.05.2013 21:00, schrieb Steve Gray:
> Hi,
> Today I've been working on ColourPET again. I was re-arranging the 
> output bits to match C128 VDC colours, when I noticed the background 
> colours are all wrong. So I looked on the PET schematics, and for the 
> video ram Commodore mixed up the ordering of the bits (probably to 
> make routing easier) going from the 2114 chips to the latch. DOH! I've 
> read the schematics a hundred times and missed this. Anyway, off to 
> re-wire again ;-)
> Steve
>     *From:* Steve Gray <>
>     *To:* "" <>
>     *Sent:* Tuesday, April 30, 2013 4:29:29 PM
>     *Subject:* Re: My ColourPET Project
>     Olaf,
>     No problems. I really appreciate you coding it! I also have Ubuntu
>     that I run under VirtualBOX too (really just as a test
>     environment.. but normally I don't do Linux ;-)  )
>     I actually like the ordering from the VDC so I'll probably switch
>     to that anyway. I would like to have the foreground colour in the
>     lower nibble. I just need to make sure the hardware matches that.
>     Thanks again!
>     Steve
>         *From:* Rhialto <>
>         *To:*
>         *Sent:* Tuesday, April 30, 2013 2:51:41 PM
>         *Subject:* Re: My ColourPET Project
>         On Tue 30 Apr 2013 at 11:01:20 -0700, Steve Gray wrote:
>         > Ooops, I'm not set up to compile VICE. Would it be possible for
>         > someone to send me a Windows 64-bit binary?
>         It will have to be somebody else - I don't do MSWindows.
>         > Rialto, yes the colours are different but it's easy enough
>         to swap
>         > them around and it doesn't really matter until the hardware
>         is more
>         > finalized.
>         Ok, no problem. Just let me know at some point how they should be.
>         I just looked for an example of an RGB palette and found the
>         colours of
>         the VDC, which seemed to match so I copied them.
>         For now this patch is not in a state to be put in VICE anyway,
>         not even
>         in the development version..
>         > Steve
>         -Olaf.
>         -- 
>         ___ Olaf 'Rhialto' Seibert  -- The Doctor: No, 'eureka' is
>         Greek for
>         \X/ rhialto/at/    -- 'this bath is too hot.'
>               Message was sent through the cbm-hackers mailing list

Christian Dirks

       Message was sent through the cbm-hackers mailing list
Received on 2013-05-08 23:00:03

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