[Coco] A cartridge to hack

[Mark McDougall]

On 22/09/2012 8:59 AM, chadbh74 at hotmail.com wrote:

> Mark, im interested in obtaining one of these boards assembled with
> socket...is that 28 pin 2764/27128 compatible? Let me know how we can do
> this thanks!

28-pin 27C256/512 compatible.
<http://members.iinet.net.au/~msmcdoug/coco/coco-flash%20(schematic).pdf>

A quick look suggests you could use 2764/27128. The PGM# pin is wired to a 
jumper (16/32KB selector) to select between either A14 from the connector, 
or the output of a dipswitch. If you left the latter open, PGM# would be 
pulled high.

I'll see what parts I have available in the office on Monday... I _might_ 
even have surplus 27C26's...

Regards,

-- 
|              Mark McDougall                | "Electrical Engineers do it
|  <http://members.iinet.net.au/~msmcdoug>   |   with less resistance!"