[Coco] FW: Attempting to upgrade a CoCo2

[Kip Koon]

Hi, Mike,
I'd be happy to.  Please let me know what you setup is again.  Also, do you want OS-9 or NitrOS-9?

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 Mike Howard
> Sent: Saturday, May 07, 2016 3:12 PM
> To: CoCoList for Color Computer Enthusiasts
> Subject: Re: [Coco] FW: Attempting to upgrade a CoCo2
> 
> Kip,Mike here. been a while since I have talked to you.I need your help again.
> I have lost the files that let me load and run os-9. Would it be possible to post the files that I need so I can get os-9 running again.
> 
>                                                                Thanks Mikew H.
> 
> On Sat, Oct 5, 2013 at 4:53 AM, Kip Koon <computerdoc at sc.rr.com> wrote:
> 
> > Hi Mike!
> > You will have to find someone who either has a 24 pin mask programmed
> > rom from Tandy for ECB 1.1 or program an MCM68766 8K x 8 bit eprom
> > with ECB 1.1 or get a 24 pin to 28 pin eprom adapter and program a
> > 2764 8K x 8 bit eprom.
> >
> >  I found my Color Burner which can burn MCM68764s, but I have never
> > burned a
> > 68766 yet.  I need to see how close to a 68764 the 68766 is.  I bought
> > some recently, so I plan to play with them and see how it goes.
> > I also just created a 24 pin to 28 pin eprom adapter that will hold a
> > 2764 8K x 8 bit eprom.  I haven't tested it yet in my disk controller
> > to hold HDB-DOS.  It is designed to replace the MCM68364 mask
> > programmed roms Tandy used on the motherboards, disk controllers and some rom cartridges.
> > If you'd like, I'll go ahead and test it and see how it does.  It
> > should work as the circuit is pretty simple.  I have been exploring
> > making PCBs of late and this is my third or fourth PCB I've made.  I'm
> > having a lot of fun with it.  Take care my friend.
> > Kip
> >
> > -----Original Message-----
> > From: coco-bounces at maltedmedia.com
> > [mailto:coco-bounces at maltedmedia.com]
> > On
> > Behalf Of Mike Craig
> > Sent: Friday, October 04, 2013 9:55 PM
> > To: coco at maltedmedia.com
> > Subject: [Coco] Attempting to upgrade a CoCo2
> >
> > Hi Everyone. I recently got my paws on a CoCo2 16k 26-3134. I'm going
> > to hunt down a 2716 Eprom and program it with ECB tomorrow. I'm lucky
> > in the fact that I have a surplus company around the corner from with
> > with parts of all kinds. Question I have is about the RAM upgrade. The
> > eight RAM chips are 8040517's and from what I understand, I have to
> > replace them with 4164 chips of 200 ns or better access time, and to
> > solder a wire between the two pads labeled J1. I'm assuming that all
> > eight chips need to match speed wise. I did a search on Ebay and see
> > lots of them listed. I have my eye on these 'NEC Dynamic RAM Memory
> > 64K x 1-Bit UPD4164C-15'. Would those work? And am I barking up the
> > right tree so far? :D
> >
> > Thanks,
> >
> > Mike
> >
> >
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