On Apr 26, 11:36, emanuel stiebler wrote: Sure. The DIL switches are small rectangular objects about 0.4" x 0.7" and the jumpers... (Sorry, I can rarely resist that :-)) I think this is what you want: There are 2 layouts, Revision A and Revision C. ___ ___ | \__________________||______________________||___________________/ | | 5017547A1 o | | R o-o W5| | | P o-o o-o | | N o-o W6 | | M o-o | | oA | | o | | __oB | | | |1 | | SW1 | | o W1 | | | | o | | M7551-AA |___|6 o W2 | | MSV11-QA oK | | REV.A o | | oL | | ___ | | | |1 | | SW2 | | | | | | | | |___|6 | | | | o | | C | D | | o-o | | +5V o-o-o | | o-o J H | |_ _|| _|| _|| | _| | | | | | | | o +5VB | |______________| |______________| |______________| |______________| ___ ___ | \__________________||______________________||___________________/ | | 5017547-01-C1 | | J11,9,7,5 | | J10,8,6,4 | | | | J3 J2 J1 | | ___ | | | |1 | | M7551-xA SW2 | | | | MSV11-Qx | | | | REV.C |___|6 | | | | where x = A = 1MB ___ | | x = B = 2MB | |1 | | x = C = 4MB SW1 | | | | | | | | |___|6 | | | | | | o o | | +-o o-+ | | W3 | o o | W1 | | +-o o-+ | | J17,16,15 J14,13,12 | | | |_ _|| _|| _|| _| | | | | | | | | |______________| |______________| |______________| |______________| Address switches: Start Address End Address Board No SW1 SW2 SW2 Version in system 4 5 6 4 5 MSV11-QA 1 0 0 0 1 1 2 1 1 1 0 1 3 0 1 1 1 0 4 1 0 1 0 0 MSV11-QB 1 0 0 0 1 1 2 0 1 1 0 0 MSV11-QC 1 0 0 0 0 0 0=ON, 1=OFF SW2-1, -2, -3 and SW1-1, -2, -3 are all ON. SW1-6 is not used. CSR Address: Rev.A jumpers R,P,N,M all IN Rev.C jumper J4-J5, J6-J7, J8-J9, J10-J11 AND then: Board No in system CSR addr 1 17772100 2 17772102 3 17772104 4 17772106 The other Rev.A jumpers are: W1 IN block mode enabled W6 IN Manufacturing test (do not remove) B IN CSR selection enabled C IN Manufacturing test (do not remove) H IN enable parity error detection L IN 22-bit addressing selected +5V/+5VB do not use, this module does NOT support battery-backup option The other Rev.C jumpers are: J1-J2 IN Manufacturing test (do not remove) J13-J14 IN on -QA Select 64K RAMs OUT on -QB,-QC J15-J16 IN on -QA Select 64K RAMs OUT on -QB,-QC J12-J13 IN on -QB,-QC Select 256K RAMs OUT on -QA J16-J17 IN on -QB,-QC Select 256K RAMs OUT on -QA W1,W3 IN Battery backup option setting -- Pete Peter Turnbull Dept. of Computer Science University of York