[Coco] 512K EEPROM...or 4MB!!?

Mark Marlette mmarlette at frontiernet.net
Wed Dec 9 08:30:45 EST 2015

Ok, I'll jump in here and it is not my intent to take away from anyone's project but to inform others that might not be aware.

This already is a product called the miniFLASH that I produce and is currently available. Though Jim and Chad's devices are larger, most, as others have indicated here, don't have that need for such a large device, YMMV. I can see when designing to have a larger device as the additional size is almost free. When in production, stocking different sized components is not free. :)

The miniFLASH is programmable from the CoCo and takes ~20 seconds to program a FLASH bank.
The cost is $55 and comes with case(though the top is removed in the picture), documentation and software. S/H are additional.

Documentation is online along with more information at :
An addition benefit is that it comes with John Linville's CoCoDOKU, FollowCoCo. Other banks include DriveWire for CC2 and DriveWire for CC3 already pre-FLASH'd into the banks.

 Mark Marlette
     From: RETRO Innovations <go4retro at go4retro.com>
 To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com> 
 Sent: Tuesday, December 8, 2015 11:46 PM
 Subject: Re: [Coco] 512K EEPROM...or 4MB!!?
Though it was not available to demo at the Coco show in 2015, I have on 
my bench a prototype 8MB Flash Cart, offering the following features:

  * it can be programmed by the Coco (1/2/3)
  * It can hide the registers, and unhide them.
  * The base address of the registers can be changed by the Coco
  * It supports mapping any 2kB region of the flash cart into the Coco
    cartridge address space
  * I believe it supports up to 32kB address space, but I am not 100%
    sure I have the logic correct for that (it would work, I just have
    not tested it)
  * It offers 2 momentary switches that can be read under software control
  * It supports a single LED that can be software controlled
  * It fits in a small Coco cartridge case
  * It is licensed under CC3.0 license
  * Can be produced pretty cheaply (under $50 for sure)

Obviously, it lacks a nice programmer utility, which is where the 
project basically stopped.  It's viable and cheap, but does require 
software development to be useful.  I currently do not have the time to 
write such a utility, but I have two units and am happy to send them to 
interested individuals who are capable of writing said applications 
(needs a menu and a programmer app).  I can provide any technical 
support on how to program, but my 6809 ASM and even my Coco BASIC 
prowess is limited.

Not trying to rain on your parade, but thought I should lay my card(s) 
on the table.


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