> > On the AXPpci33 board, the SROM is also an 8 bit device. What happens is > that the CPU reads in a bit stream into cache at power up reset, where the > specific bit stream is selected by the jumper position on the board. In > effect the SROM can contain up to 8 bit streams. Some of them will make use > of the SROM console port. >
Thanks. The light bulb has gone on over my head at last! Each of the 8 bits in the EPROM is a separate serial data stream. My ohmmeter confirms that the data out pins on the 27C512 EPROM are connected directly to one side of the bank of jumpers J1-J8. In light of this, I've tried making sense of the EPROM data again but I still don't see any ASCII strings (like "SROM" or "Powerup Sequence" for example) jumping out at me. Maybe the word size in the serial streams is not a multiple of 8 bits or something odd like that or maybe I'm just making a mess of assembling the bitstreams. Regards, Peter Coghlan.