Are there any HP80 seires experts here? I've got a curious quesiton. I am looking at the HP82909 128K RAM module (for the HP86/87 series). There are several places on the PCB that are not used -- from memory, thre are 4 locations for 14 pin ICs. More curiously, there's a place for a rssistor and transsitor to drive the ROMDIS/ line on the computer connector. I am pretty sure the 'missing' chips are simple logic functions. One is very probably a '74. Another may well be a '30. But I haven't worked out the details yet. My guess is that some HP product actually used this extra logic. So my 'curious quesiton' is : What product was it? -tony