Re: General 6809 card for 6502 machines

Very nice! Will this support the TPUG MMU functionality?
Steve

      From: Nils Eilers <nils.eilers@gmx.de>
 To: cbm-hackers@musoftware.de 
 Sent: Wednesday, October 18, 2017 11:18 AM
 Subject: Re: General 6809 card for 6502 machines
   

> How about adding 244/245s as external tristates? That way we could get
> rid of the "power off" thing but still reuse the existing 6502. But it
> would cost board space, maybe it wouldn't fit in the 10x10 format?
Indeed, they require lots of board space. The original design might seem
kind of brutal but it has been working for decades so I don't see a
strong requirement to change it now.
 

>  
>> If some of you guys would be interested in having a look at my design,
>> I'd upload the design to my website. As I said, it's almost done, but
>> maybe good reasons will arise for late time changes.
> Can't promise anything but if you put it on your site we might have
> some feedback to give :)
>

Okay, so here we have a rendered picture of how the board should look like:
http://petsd.net/tmp/superpet.jpg

The schematics:
http://petsd.net/tmp/superpet.pdf

And the current state of the component side of the PCB layout:
http://petsd.net/tmp/superpet-F.Cu.pdf

Please note that this is a preview only and the files may vanish at any
time.

My PCB manufacturer produces the boards in quantities of tens but 10
boards is way more than I need so I'd be willing to sell the surplus boards.
Any feedback is highly appreciated. If you find a bug, you'll get your
board for free.

Nils



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