[Coco] CoCoEPROMPak

[Chad H]

I have already made a mod to your schematic and board files to allow for a
extra '3-way' header (actually 2x3).  I decided on this approach for safety
as it seems to me that accidentally connecting 5V or Ground back to the Host
A13 line might not be so good

Essentially it will provide this...

1  4     Pins 4,5,6 match with your JP2/JP3 wiring (if I want to select 8K
banks)
2  5     Pin 2 runs back to the Host A13 line, so jumpering 2-5 instead of
above results in 'original' A13 flow.
3  6     Pins 1 & 3 not in use.

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Mark J. Blair
Sent: Thursday, November 28, 2013 12:23 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] CoCoEPROMPak


On Nov 28, 2013, at 10:14 , Chad H <chadbh74 at hotmail.com> wrote:
> Well I may have a answer to my own question, someone please correct me 
> if I'm wrong.  According to the Schematic, the JP2 and JP3 select 
> banks via the
> A14 and A15 lines respectively.  What if I inserted a similar jumper 
> on the
> A13 line?

Yes, that should work. In order to keep things simple, I just made it
support full 16k banks. You get two of them with a 27256, or four of them
with a 27512. Adding a jumper on the EPROM's A13 line would let you use 8k
banks instead. You could either rework an existing board, or use my Eagle
files as a starting point to make your own version of the board.

I'm happy that folks are finding it useful!

--
Mark J. Blair, NF6X <nf6x at nf6x.net>
http://www.nf6x.net/


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