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

[chadbh74]

   So the xc95144xl CPLD becomes a all in one handler?  Hmm... I really
   need to learn how to use CPLDs

   -Chad

   https://sites.google.com/site/cbhlab101/

   Sent from my Galaxy S4

   --------- Original Message ---------
   From: RETRO Innovations
   To: CoCoList for Color Computer Enthusiasts
   Date: Wed Dec 09 13:42:43 CST 2015
   Subject: Re: [Coco]A Re: 512K EEPROM...or 4MB!!?
   I am currently using an 29lv640eb, which is a 3V3 part. I then use a
   single xc95144xl to do voltage shift, implement the bank registers and
   a config register (reading the switches, allowing writes to go to the
   ROM, turning on the LED, and moving the base address of the 4
   registers) and implementing the "full adder" that takes the bank
   register to the incoming address lines A15:11.
   I have found a cheaper 8MB ROM I am checking out, but I don't remember
   the part number. Search on Digikey and you'll find it.
   Jim
   On December 9, 2015 at 2:29 PM chadbh74 <chadbh74 at hotmail.com>
   wrote:
   Out of curiosity, what are you using for your 8MB chip?
   -Chad
   https://sites.google.com/site/cbhlab101/
   Sent from my Galaxy S4
   --------- Original Message ---------
   From: RETRO Innovations
   To: CoCoList for Color Computer Enthusiasts
   Date: Tue Dec 08 23:46:09 CST 2015
   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.
   Jim
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