[Coco] 128K CoCo2

Tue Apr 21 21:12:17 EDT 2015

Hi Joe,
I'll be happy to take some pictures for you.  I have is a cell phone, but I have problems trying to take focused pictures.  I'll also try my video camera that has still picture capability, but again close distances seem to be a problem focus wise.  I'll do the best I can.  :)  

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon

> -----Original Message-----
> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Joe Grubbs
> Sent: Tuesday, April 21, 2015 8:12 AM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] 128K CoCo2
> 
> Thanks Kip. Would you mind snapping a few pictures of it in your CoCo? I want to replicate this and would like to see how it was
> executed in real life.
> 
> -Joe
> 
> 
> > From: computerdoc at sc.rr.com
> > To: coco at maltedmedia.com
> > Date: Tue, 21 Apr 2015 01:04:14 -0400
> > Subject: Re: [Coco] 128K CoCo2
> >
> > Hi Joe,
> > I just looked at the article you mentioned below and my 128K upgrade is exactly what the article describes.  I tried the POKE
> statements and I get no garbage screens so I wonder if I have the wrong Coco 1 on my Computer Data Center table.  I'll have to check
> that out later though as I am preparing for the CoCoFEST trip.  I have to make sure all the SBCs I want to demo are in good working
> order!  :)  Let me know your progress on your software project.  An alternate version of NitrOS-9 L1 to take advantage of this 128K
> modification would be interesting to say the least!
> >
> > Kip Koon
> > computerdoc at sc.rr.com
> > http://www.cocopedia.com/wiki/index.php/Kip_Koon
> >
> >
> >
> > > -----Original Message-----
> > > From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Joe
> > > Grubbs
> > > Sent: Sunday, April 19, 2015 5:13 PM
> > > To: CoCoList for Color Computer Enthusiasts
> > > Subject: Re: [Coco] 128K CoCo2
> > >
> > > Yeah I'd have to write my own code to take advantage of the extra
> > > 64K. Just curious if anyone here has actually performed the upgrade and if 128K is the practical limit before doing some massive
> surgery.
> > >
> > > FWIW the article can be found on page 162 of:
> > > http://www.colorcomputerarchive.com/coco/Documents/Magazines/Rainbow
> > > ,%20The%20%28Clearscan%29/The%20Rainbow%20V
> > > ol.%2004%20No.%2005%20-%20December%201984.pdf
> > >
> > >
> > >
> > > > From: os9dude at gmail.com
> > > > Date: Sun, 19 Apr 2015 14:41:18 -0400
> > > > To: coco at maltedmedia.com
> > > > Subject: Re: [Coco] 128K CoCo2
> > > >
> > > > On Sun Apr 19 2015, Joe Grubbs wrote:
> > > >
> > > >
> > > > > While searching for the reverse video mod in old issues of
> > > > > Rainbow, I stumbled upon an article detailing a simple way to take a CoCo2 to 128K.
> > > > >
> > > > > Has anyone ever done this? And is 128K the upper limit *without*
> > > > > doing massive surgery? This circuit was nice because it retained
> > > > > the SAM, added a few logic ICs, and used a piggyback set of
> > > > > 4164s
> > > > >
> > > >
> > > > There were several options to go 128k on the CoCo 1/2 and all of
> > > > them
> > > > - if I recall correctly - were straightforward 32k bank switching
> > > > schemes, there was no way for plain old Basic to access the
> > > > extended RAM for programs but only as a RAM disk or printer
> > > > spooler.  Maybe OS9 could make better use of the extra RAM.
> > > >
> > > > Don't recall ever seeing any software marketed for 128k.
> > > >
> > > > --
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