[Coco] FW: CoCO EPROM -- 32K test??

[Chad H]

That's interesting.  Well the cartridge should already be 'decoding' up to 32K.  If it is, the only thing missing would be the SLENB*.  What is happening there?  Tying it to +5V or GND?  If that's the only thing  missing, it seems plausible someone could make this small mod (jumper?) and use the cartridge to 'Upgrade' their CB to ECB, or to a modded version of it.

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Darren A
Sent: Saturday, December 13, 2014 1:40 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] FW: CoCO EPROM -- 32K test??

On Sat, Dec 13, 2014 at 11:54 AM, Chad H <chadbh74 at hotmail.com> wrote:

> Well that sucks. But I guess if the CoCo 2 could be made to access 32k 
> blocks of cartridge ROM someone would have already done it.



The CoCo 1 and 2 can access 32K cartridge ROM, but it would require the addition of an address decoding circuit on the cartridge. You would need to decode the additional 16K (8000-BFFF) and assert the SLENB* cartridge pin to override the internal ROM selection.

Darren

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