Floppy reader/writer project

Antonio Carlini wrote: It's almost, but not exactly the same. Actually, the DIMMs are more likely to be 16Mx64 -- four sets of 16 bits. Connecting everything up so you could use all the RAM would involve a much bigger (higher pin count) FPGA than I've got on the board now... Frankly, it's far easier to put an SDRAM chip on the board and be done with it, rather than add a large amount of cost for something few people would use. And why would you need that much memory anyway? The address counter resets to zero when the controller gets a READ_DISC or WRITE_DISC instruction, so there's not really that much point to it, unless you want to get four or five reads of the same track before giving up and moving on. Also, SDRAM DIMMs of the SDR variety aren't as easy to come by as they once were, and in my experience the quality tends to be quite variable... I'd hate for a disc image to be wrecked simply because of a dodgy SDRAM (yes, I'm putting a RAM test in the firmware...) -- Phil. | (\_/) This is Bunny. Copy and paste Bunny classiccmp at philpem.me.uk | (='.'=) into your signature to help him gain http://www.philpem.me.uk/ | (")_(") world domination.