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

[Mark Marlette]

The current version I have does this in 

32K = 0.0559375 seconds or 55.93mS.16K = 0.02796875 seconds or 27.97mS.  8K = 0.013984375 seconds or 13.98mS.
Also the Xmega will be doing DMA in to the CoCo's memory. Not there yet on this one, slight logic change on the memory control. Slow? Relative term........ :)
Mark Marlette http://www.cloud9tech.com
mark at cloud9tech.com
 
      From: Chad H <chadbh74 at hotmail.com>
 To: 'CoCoList for Color Computer Enthusiasts' <coco at maltedmedia.com> 
 Sent: Thursday, December 17, 2015 7:17 PM
 Subject: Re: [Coco] FW: My EEPROM/Flash multicart holy grail??
   
I thought about that a while back, but loading the 32K images from SD card would be slow would it not?

- Chad H
http://sites.google.com/site/cbhlab101/


-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Darren A
Sent: Thursday, December 17, 2015 6:45 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] FW: My EEPROM/Flash multicart holy grail??

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

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