RE: PET hi-res board

Date: Mon, 23 Jul 2012 22:01:39 +0200
Message-ID: <004201cd690d$f97ecae0$ec7c60a0$@org>


I’m not really sure if this board was successful in France.

Many modifications were needed to use it.


1/ we had a version without power connector for the 64k ext (so we had to hack the board)

2/ we had an eprom named “EDEX” delivered in all French commodore…


I remember having modified a few early boards to adapt to the 64k + edex.


It was probably rarely sold and modified one by one…


The 512x512 mode was just useless with the board I had in hand

And no support for an external monitor.


256x512 was nice but really slow it’s the mode I’ll try to support

(not enough memory on a propeller)


Roughly I’m emulating using a graphic screen inside the propeller

And a screen map too, using 1, 2 or more cogs to copy the data between 

The screen map and the graphic one.


The charset room would be loaded inside the propeller too…


I would probably use a spi slave on a cog to exchange the data with the avr.

actually I’m using a avr xmega xplained 128A1 to develop the cpu (mostly working, need speed up and testing)

(the goal is not to emulate 1 pet but all the pet from PET  2001 to superpet )  (for the superpet I’m dreaming….)


I’ll probably use this module 

with ebi on sram + with a CPLD to modify the addresses on the fly

the timings are ok in 8032 mode but horrible as soon as I try to implement the memory management of the 64k ext.

(in that case the propeller would be emulating a peripheral too (problem: lack of pins…)







De : [] De la part de Steve Gray
Envoyé : lundi 23 juillet 2012 21:39
À :
Objet : Re: PET hi-res board




That would be amazing. I'm not sure if it's worth the effort though. The GDP chip looks complicated to try to emulate, and I don't know of any real software that would use it. Still, if you think you can do it, more power to you!


I find PET graphics cards facinating... I wish I had more ;-)




From: "" <>
Sent: Monday, July 23, 2012 2:55:25 PM
Subject: RE: PET hi-res board


Thanks, I’ll try to support the graphic card in my emulator for the PET on avr.

(actually struggling with the video on a propeller…)


I’m trying to build a small card with a vga connector, an ieee-488 bus, a user port

A ps/2 or us keyboard, and 1 or 2 sd cards


Something acting like a commodore 8032+ 64ext + graphic card

Something fun and cheap, just for fun and some friends….






De : [] De la part de Steve Gray
Envoyé : lundi 23 juillet 2012 17:51
À :
Objet : Re: PET hi-res board




I have updated my HSG page with additional resources and links.


The D64 I posted has some extra non-related files at the top, but I wanted to post it anyway for you. This reminds me I have to update my CBMXfer program to allow files to be deleted inside D64 images ;-)


Anyway, I also posted all the roms that came with my 8032 machine with the HSG board. Someone patched the PET roms to autostart the HSG basic extensions, so those are included too.


Rob, do you mind if I include a couple of your pictures on my page?




From: Rob Clarke < <>>
To:  <> 
Sent: Sunday, July 22, 2012 7:57:39 PM
Subject: Re: PET hi-res board

Thanks for this Steve. I tested the board and it appears to work. 
WooHoo! I will provide whatever info I usefully can. I would really like 
some better demo programs so yourt D64 would be great. I tested the 
board using the v. simple test program on page 5 of the manual, as can 
be seen from the screen shots.

Pics and a ROM dump:

@Mike : Although I live in Switzerland my German is awful, I can ask my 
kids or friends to help with translation where required.


On 22/07/2012 20:03, Steve Gray wrote:
> Rob,
> I'd love to see pics of your board and some screens. If you can contribute to my hsg page that would be great too! We should compare roms as well to see what differences, if any, there are to the 512x256 version that i have. Im going to try posting a d64 of the demo programs i typed out for my board. You can buy the thompson ef9366 chip for $15 on ebay, or the 65 like your board for about $50.
> Steve
> On Jul 22, 2012, at 12:19 PM, Rob Clarke <> wrote:
>> Steve G found it for me:
>> On 22/07/2012 16:53, Rob Clarke wrote:
>>> Good afternoon gentlemen, I picked up an 8296 at the weekend which I found has the 512 x 512 hi-res board installed. Does anyone have an english version of the manual?
>>> cheers, rob
>>>        Message was sent through the cbm-hackers mailing list
>> Message was sent through the cbm-hackers mailing list

      Message was sent through the cbm-hackers mailing list


       Message was sent through the cbm-hackers mailing list
Received on 2012-07-23 21:00:05

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