[Coco] Fwd: Commodore PET 8032 add-on SuperPET2 board.

[Bill Nobel]

That might be something to look at.  I am currently porting Nitros9 Level 2 to Neal Crooks Multicomp09 project.  His MMU is similar to the Coco 3 as he has task registers and support for 1MB of RAM.

Bill Nobel

> On Feb 22, 2016, at 1:54 PM, Boisy G. Pitre <coco at toughmac.com> wrote:
> 
> Here’s a great opportunity for someone to help with a port of NitrOS-9 Level 2 to a new MMU board for the SuperPET. I’ve forwarded Dave’s email with his permission.
> —
> Boisy G. Pitre
> CoCo Projects Coordinator
> http://www.cloud9tech.com <http://www.cloud9tech.com/>
> http://www.nitros9.org <http://www.nitros9.org/>
> http://sourceforge.net/projects/drivewireserver/ <http://sourceforge.net/projects/drivewireserver/>
> http://sourceforge.net/projects <http://sourceforge.net/projects/drivewireserver/>/toolshed
> http://liber809.blogspot.com <http://http//liber809.blogspot.com>
> http://github.com/boisy/DriveWire-MacServer
> 
>> Begin forwarded message:
>> 
>> From: davee.roberts at fsmail.net
>> Subject: Commodore PET 8032 add-on SuperPET2 board.
>> Date: February 21, 2016 at 2:52:21 PM CST
>> To: boisy.pitre at affectiva.com
>> Reply-To: davee.roberts at fsmail.net
>> 
>> Hi,
>> 
>> It's a while since we exchanged e-mails.
>> 
>> I have now completed the schematic for my add-on SuperPET2 board for a Commodore 8032 - and my mind is now turning to the PCB layout itself.
>> 
>> I have thought about the memory mapping and have decided to incorporate an SN74LS610 dedicated MMU. I have outlined my proposed scheme at 
>> http://www.vcfed.org/forum/showthread.php?48829-Commodore-8032-add-on-board-SuperPET&p=403172#post403172. 
>> 
>> I tried last week to get my head around the NitrOS-9 source code - but failed dismally. I will have another look when I have some more time.
>> 
>> If you are still interested in porting NitrOS-9 to my SuperPET2 add-on board could I ask that you take a look at what I am proposing to see if it is vaguely sensible? My scheme 
>> involves using 4K pages (instead of 8K on the CoCo 3) and I have the ability to map the standard PET memory, screen and I/O page around as I wish - with the proviso that the I/O 
>> page ($0EXXX) is mapped somewhere available to the CPU (otherwise we can't control the MMU ever again as we can't get to the I/O page).
>> 
>> If you are not interested - would you be able to answer a few questions regarding porting NitrOS-9 when I get the hardware working and I turn to the software?
>> 
>> Regards,
>> 
>> Dave
> 
> 
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