[Coco] FW: My EEPROM/Flash multicart holy grail??

[Darren A]

On Thu, Dec 17, 2015 at 5:24 PM, Chad H wrote:

> Ok, long story short. So I expanded the EEPROM board in order to support
> the
> 4MB chip to now included 2 x 74HC595 8-bit registers.  However, the 4MB
> chip
> only needs 3 of the additional 8 address lines.  The dual shift registers
> combined with the updated bit control table will actually support up to a
> 128MB parallel FLASH chip.   Very little code change was made to the
> external controller and no hardware changes were made to it.
>
>
>
> However, this is a slight problem.  So far I have been unable to find any
> chip that large that the MCUMall GQ-4x or the TL866 will program.
>
>
>
> When searching support for candidate chips, such as the Intel
> JS28F00AM29EWHA in TSOP-56 package, the cheapest programmers I've found
> that
> will handle them are over $1,300.  :/     I realize trying to encorporate a
> 128MB chip into this project is little crazy and overkill but who knows?
> Might find a use someday.  Can anyone point me to a programmer under a
> grand
> atleast that would do this sort of chip?
>


Skip the giant EEPROM and just make a 32K RAM board.  Have your arduino
load the ROM files from an SD card and put it in the RAM for the CoCo to
access. Then you can have GIGABYTES of ROM images and no need for a chip
programmer.

- Darren