[Coco] Upgrading a CoCo 2 to ECB

[doctorx0079]

This is starting to sound like way too much work. I think if I want to play
with the CoCo 2 I will just get a tape drive, seeing as I don't really want
to use BASIC anyway.

>
> Message: 3
> Date: Thu, 29 Jun 2006 22:41:49 -0400
> From: Robert Gault <robert.gault at worldnet.att.net>
> Subject: Re: [Coco] upgrading a CoCo 2 to ECB
> To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
> Message-ID: <44A48F6D.1050001 at worldnet.att.net>
> Content-Type: text/plain; charset=us-ascii; format=flowed
>
> Roger Merchberger wrote:
> > Rumor has it that Robert Gault may have mentioned these words:
> >
> >>  Open up the Coco2. You should see two sockets or at least two in-line
> >> solder points on the board. One is for the Basic ROM and the second is
> >> for the Extended Basic ROM.
> >>  You don't replace the Basic ROM but add the new Extended Basic ROM.
> >> This is the normal upgrade procedure which Tandy would perform.
> >
> >
> > Yes, but be warned - a bit of knowledge about different EPROM families
> > is warranted here! Most people are accustomed to the 27xxx series of
> > EPROMS, but their 8K EPROMS had 28-pins. On a CoCo the ROM sockets only
> > have 24-pins.
> >
> > If someone burns extended BASIC to a 2764, you/they will have to make a
> > converter board to rewire the pins to the correct pinout.
>  ><snip>
>
> If the pinout for the Extended ROM is the same as the pinout used in a
> ROM pack or Disk controller, you don't need a converter board. Adapting
> the 28 pin 27xxx series to the 24 pin Pak/Controller is very simple and
> just requires several thin wires and perhaps lifting a pin on the EPROM.
>
> I have the details somewhere and can post them is requested.
>