> > > > I just looked up the tech manual page 5-46: "The system can address up to > > 512kbytes per daughter board slot" so my memory wasn't that bad after > all. > > Yes, indeed. And the key item is shown on the daughtercard connector > description: it has address lines 0..8, so 9 address bits, times 2 since > DRAM has row and column addresses, that makes 256 k words. What's > different compared to the 380 is that there doesn't appear to be a signal > that says which chip size is present, unless it's that "reserved" pin 39. > The Pro 30 has pin 43, P256KD L, in other words, "this pin is connected to > ground if the card has 256k chips on it". > > I wonder if those memory chips are still available. Alternatively, I > suppose one could emulate the whole daughtercard (the DRAM protocol and the > memory too) in an FPGA. :-) >
There are 256 k chips (Intel & TI) available from a Swedish surplus seller. Similar type of chips show up on Ebay as well, for example this listing http://www.ebay.com/itm/111748975992 > > paul > >