Upgrading the Propeller Demo Board's EEPROM

LoopyByteloose

Okay, I am really enjoying PropForth, but would like to take advantage of more EEPROM by removing the existing 32K from my Propeller Demo Board and replacing it with a larger one. I am sure I can locate 64K, but I am wondering how large is available that is compatible to the existing chip's footprint.

After all, it I am going to change it, I might as well go big.

Duane Degn

I'm pretty sure the limit for a Propeller compatible (bootable) EEPROM is 128K. Do you need a part #? I'm sure I have one somewhere.

Edit: I'm pretty sure this (128K) one will work.

LoopyByteloose

Thanks, that looks good. But I have to check that the internal page write firmware is the same. For less that $4 USD, this will make my Demo Board a great PropForth platform.

Duane Degn

Loopy Byteloose wrote: »

Thanks, that looks good. But I have to check that the internal page write firmware is the same. For less that $4 USD, this will make my Demo Board a great PropForth platform.

I'm almost sure it is. The upper 64K is accessed by adding one to the address. This particular chip only has two address pins instead of the usual three. I'm almost positive I've used a DIP version of this chip with a Prop before without any problems.

I know Mike Green has discussed this chip on the forum before. Mike are you online?

localroger

I can verify that it is. I am using the DIP version of that chip in a PropRPM right now and it acts exactly like two separately addressed 64K chips.

Mike Green

Yes, this is the easiest to use 1MB EEPROM. It looks to the Propeller like two 64K EEPROMs at successive even, then odd device addresses. You can have up to 4 of these on a single I2C bus if you connect the address pins (A1 & A2) properly.