[Coco] 24Pin to 28Pin EPROM Adapter PCB for sale

[Chad H]

Self correction:
  * EPROM's supported: 2764, 27128, 27256, 27512

  * Controller Pictured:  FD-500 (26-3029)

-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Chad H
Sent: Saturday, February 07, 2015 1:44 PM
To: 'CoCoList for Color Computer Enthusiasts'
Subject: [Coco] 24Pin to 28Pin EPROM Adapter PCB for sale

With my recent acquisition and ongoing restoration attempt of a FD-500 controller, one of the things I wanted to do was get the 24-pin ROM out and put in an adapter for 28-PIN EPROMS (2764, 27128, 27256 & 25512).  I took a look around the web and at the Cloud-9 unit but honestly they were all a bit pricy for me and didn't give me easy access to the A13, A14 and A15 lines like I want because eventually I will be installing switches on the case to allow me to power down and switch ROM's quicker.

 

So. I designed my own PCB's and just tested one with the controller.  You can see pictures here .

http://tinyurl.com/m8992jh

 

The boards have header/wire access points for:  VCC, GND, A13, A14, A15 to make it easier to wire up switches.

 

The FD-502 controller pictured has a single green wire running from the A13 pin to the cartridge connector to allow the 16K rom to work properly and it has been very stable.  I will be adding switches for the A14 and A15 lines so I will be able to put 4 x 16K ROM's on a 27512 and have pretty much all my standard ROMs in one place, which I did on a EPROM adapter but not on floppy controller yet.

 

Anyways, I only really needed one of the PCB's so I have 2 extra if anyone is interested.


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