I was wondering if anyone has used Flash in a 'standard' configured 6502 application? By this I mean, SRAM from 0000 to 7FFF and Flash from 8000 to FFFF.

The problem that I have is that I am using a 39SF010 which requires a programming sequence of :

1) write a value to 0x5555
2) write a value to 0x2AAA
3) write desired address

The problem is that those addresses to set up the flash chip are in the middle of RAM, so the flashes' CS line won't be pulled low....

Any help would be appreciated.... Thanks

Tony

In case it helps:
I've been successful in using a 28F010. It does not require writing to any special addresses. Instead, it works by writing a special *data* byte, then the desired data, then you do a verify, etc. I have a short chunk of code that does it - let me know if you need it.

I've also tried a 29F010, but I never got it to work (I wanted to use it because it supports 'banks'). It requires the 'special address' thing you described, although I thought it was a 12-bit value, not 16-bit (???).

Pete