[Coco] STATUS - Re: Resurrecting a CoCo (26-3001) with a 26-3029FDC.

[Mike Pepe]

Unfortunately the only 26-3001 I have documented at 

http://www.doki-doki.net/~lamune/computers/coco/26-3001/

is an original 4K machine. I have a 64k upgraded one (in bad physical
shape) somewhere in my bins of CoCos. If I see it I'll grab it and share
the upgrade method, but in a nutshell I think what they did was set the
jumpers to 32K and then route the center pin of the HIGH/LOW jumper to
Z7 of the SAM.

Also in the case of floppys that don't work right- assuming the drives
are good and the cable is correct- a blown FIRQ line on the 6809 would
cause issues.


> -----Original Message-----
> From: coco-bounces at maltedmedia.com [mailto:coco-
> bounces at maltedmedia.com] On Behalf Of Ryan Pritchard
> Sent: Friday, September 12, 2008 5:22 AM
> To: coco at maltedmedia.com
> Subject: [Coco] STATUS - Re: Resurrecting a CoCo (26-3001) with a 26-
> 3029FDC.
> 
> Hi all,
> 
> Thanks to everyone who had responded the to my original post.  Here is
> a status update, and from the status I am hoping for some further
> assistance.
> 
> Thanks go out to Darren A for setting me up with a Extended Color
> Basic 1.1 ROM.
> 
> My 26-3029 FDC is the 7 chip WD1773 based version thus I will not be
> able to mod it to work at HD.  Oh Well!
> 
> I have been trying to format disks in either 3.5" or 5.25" (I can't
> believe I had two boxes of KAO 5.25" DSDD never opened kicking
> around).  Anyway I get IO errors at the end of the formatting routine
> regardless of 3.5" or 5.25" drive / media.
> Here is a list of my 5.25" FDDs:
> Panasonic JU-475-4 A55
> Panasonic JU-455-5 AAG
> Teac FD-55GFR-570-U
> Teac FD-55GFR 149-U5
> Mitsumi F509V3
> 
> 3.5" FDDs
> Fujitsu M2537D15D
> Fujitsu M2537B11D
> Teac FD-235HF 3240-U5
> 
> For all the drives I have tried to ensure that the DC/RY jumpers are
> set to Drive Ready and not Drive Change.  I have jumper settings for
> some of them, but it seems to not help. The cable I am using has been
> returned to straight through mode.
> 
> I am still looking for confirmed 64K ram upgrade instructions for the
> 26-3001 REV E board.  Currently it has 16K installed, the jumpers all
> mention the 32K setting.  The closest instructions I have found are
> from an archive of Paul Demarni's Coco pages
> (http://www.geocities.com/theother_bob/coco_page.html
> ).  It instructs about the 32K upgrade and makes reference to him
> having instructions for the 64K upgrade.
> 
> The other resource I have read about is from the October 1983 issue of
> Color Computer Magazine, I really hope someone has that issue, that I
> can acquire a scan of the article or arrange to acquire the issue.
> 
> Regards,
> 
> Ryan Pritchard
> Fun Extends All Basic Life Expectancies
> 
> 
> 
> On 24-Aug-08, at 9:53 PM, Ryan Pritchard wrote:
> 
> > Hello out there,
> >
> > Newby to CoCoList and to running a CoCo, but not OS-9 which I am
> > looking forward to running the NitrOS-9 flavour.
> >
> > Fourth attempt to post but this time it should work thanks to Dennis
> > telling me some information about the mailing list server.
> >
> >
> > I have recently got the bug to play with a CoCo I had acquired years
> > ago.  The good news for me, is the 26-3001 model I have is the
> > Revision E mother board which has all the jumpers on it to go all
> > the way up to 32K (and likely 64K since I know the 64K x 1 chips I
> > have are all good as they are coming from an Apple 80 Column card.
> >
> > Currently the CoCo has 16K in it, and boots up to Color Basic 1.1.
> > It has an empty ROM socket where if I have understood correctly I
> > could install and Extended Basic ROM if I had one.
> >
> > I am having a problem getting the Disk Basic on the 26-3029 FDC to
> > boot, and thus cannot format or other wise do anything disk
> > related.  Is there any common issues with the FDC that I should look
> > at to determine why the CoCo is not detecting the cartridge and
> > booting from the FDC ROM?  The PCB for the FDC has the markings LEIA
> > MV-1 38 84, and has the WD-1773-PH controller chip.  The markings on
> > the ROM are TMS4764-30NL, B8428L, ZA64342, 804-5364A.
> >
> > It does not appear visually to have any burnt caps, resistors, or
> > chips, though I have not tested any of them.  Also I have tried the
> > time tested eraser on the contacts to see if that would resolve the
> > problem, though I have not fully inspected the slot on the CoCo.
> >
> > Like many people before me, playing with a CoCo for the first time
> > in their lives, help would sure be appreciated.
> >
> > Regards,
> >
> > Ryan Pritchard
> > Fun Extends All Basic Life Expectancies
> 
> 
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