sherwin@video.dec.com (JIM SHERWIN) (01/12/90)
Let me begin by apologizing that this query is originating from w/in DEC. It's regretful how quickly we've forgotten this dandy little PC. Enough said, on to my query. I have 2 PC100B (aka 100+) memory extension boards. I am wondering if I can combine the chips from them onto a single board. Doing so would entail using 256k and 64k chips on a single board. Here are the details: Board #1 contains 9 chips with DEC part # 21-21415-02. Our BOM file describes this part # as: NMOS DRAM 150NS 256KX1 PAGE MODE 16P DIP The dip switches are set as follows Switch 1 2 3 4 ON x x x x OFF Board #2 contains 18 chips with DEC part # 21-20549-02. Our BOM file describes this part # as: NMOS DRAM 150NS 64KX1 PAGE MODE 16P DIP The dip switches are set as follows Switch 1 2 3 4 ON x OFF x x x If combining them is possible, would anyone care to suggest what the proper dip switch setting would be and, assuming the base system has 128k, what the resultant memory would be? Thanks, Jim