[Coco] Seeking ECB Rom in the US

[Kip Koon]

Bill,
I have the coco2dw3.rom image file booting Return of Coco just fine.  It has
the standard Coco 2 boot message as you can see below along with HDBDOS v1.1
DW3 Coco 2 message as well.  
DISK EXTENDED COLOR BASIC 1.1 
COPYRIGHT (C) 1982 BY TANDY
UNDER LICENSE BY MICROSOFT

HDBDOS 1.1D DW3 COCO 2
Yes, the HDBDOS DW3 Disk Basic rom image must be at $C000 and that is
exactly where it is in the rom image.  It is pretty cool.  I'm thinking of
installing a copy in my Coco 2 in one large 27256 eprom.  I need to replace
the HDBDOS DW3 Disk Basic portion of the rom with the current HDBDOS v1.4
DW3 Coco 2 rom image though.  
Anybody have an adapter they already designed that solders in place of the
soldered in rom.  How about just desoldering the Chip Select pin and
logically deselect it so it does not turn on, or better yet have a switch
somewhere to switch between the built in rom and the add-on eprom?  That way
I could use it the standard way or the HDBDOS v1.4 DW3 Coco2 way.  Since I
have external disk controllers, I could just leave it as is and put HDBDOS
v1.4 DW3 Coco 2 rom image into an 8k eprom and install In one of those.  Not
sure yet how I want to did it.  I also have to think about my coco 3 setup
as well.  What do you all think?

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Bill Pierce
Sent: Friday, January 25, 2013 12:23 PM
To: coco at maltedmedia.com
Subject: Re: [Coco] Seeking ECB Rom in the US


Kip & Sean,
I'm not sure, (I know I'll be corrected if I'm wrong), but you cannot put
the HDBDOS rom in the Coco ROM space with the CB & ECB. It goes in the Disk
controller or a rompak. The HDBDOS rom is hard coded for the Disk rom area
(it is a replacement disk rom) and would not work if mapped to the CB/ECB
area. Unless there's a way to map it higher to $C000 this idea will not
function. CB & ECB map to $$8000 & $A000. You may know more about the
mapping than I do as I'm just going on what I've gathered from others. I'm
no techie.

Bill P

Music from the Tandy/Radio Shack Color Computer 2 & 3
https://sites.google.com/site/dabarnstudio/
Bill Pierce
ooogalapasooo at aol.com