[Coco] STATUS - Re: Resurrecting a CoCo (26-3001) with a 26-3029 FDC.
coconut at pritchard.ca
Fri Sep 12 08:22:04 EDT 2008
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
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 149-U5
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.
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.
> Ryan Pritchard
> Fun Extends All Basic Life Expectancies
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