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

[Boisy G. Pitre]

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