6502.org

And at a substantial price.

Some careful design and a super-capacitor or CR2032 cell, along with a 512K x 8 SRAM can accomplish the same thing for about half the cost. You'd be trading time, board real estate and ingenuity for money, of course. Sequencing isn't that difficult as long as Vcc is higher than the nominal 3.0 VDC of the CR2032.

I have one HM628512 sram, i bought it for storing data from a/d converters, and for a digital analyzer project. I could use it for permanent data storage, but i would prefer other memories. If i am going to use i2c i will need a interface controller also, which raises the price... It would be great if 8BIT's SPI-IDE Interface would have a bus interface like my keyboard/lcd... pic interface...

Not really. I've bit-banged I²C with the 6522 many times. It's quite easy.

Ok, is there hope for the hard drive option? And the microcontroller for the ide interface is a bit hard to find... Any other solutions?

Looks like Lee has a (mostly) TTL solution for IDE.

There's an even simpler one here which treats IDE as having an 8-bit data bus - I think the idea here is that you just use half the bytes on the device - commands need only the bottom 8 bits, and for data transfers you leave the upper 8 bits alone. You won't be able to share removable media if you do this, but it is simpler.

Cheers
Ed

Edit to add: (I don't mean anything against any of the SPI-based solutions by the way. But if you happen to have old CF cards or IDE drives around, or are looking for a TTL-level solution, an IDE interface has some appeal)

Do you really need more storage than a 32GB SD card can provide ? Seems quite a lot for a simple 8 bit platform.

How could this be used with the 6502?
http://elm-chan.org/fsw/ff/00index_p.html

It's c, (a c library for FAT filesystem access) so the first step would be to have a go with cc65, I think. Then you'd need to connect it to some low-level SPI routines, or similar, if you wanted to connect to an SD or MMC card.

Cheers
Ed