On Wed, Sep 14, 2005 at 11:35:53AM -0700, Jeff Carr wrote:
I tried to duplicate the 256KB bios by putting it in a 512KB chip (SST 28SF040A vs 39SF020A). This didn't seem to work (no beep or video but didn't try port 80 parallel card yet). Perhaps someone knows if this should work.
Should. 39SF is flash while 28SF is EEPROM, but in practise this just means that 39SF is faster. As long as you can pull A18 low it should work just fine.
Can someone recommend a good place to get a handful of SST 39SF02A PLCC chips for these experiments?
Try contacting your local SST distributor. It's Memec here in Sweden, but I'm not sure if they're exclusive worldwide.
If you have a business they're usually happy to sell you down to $150 worth of goods per purchase.
//Peter