Dave, Charles and Folks -- Let me share what little I do know in case you haven't seen this yet. IBM makes very little reference to these systems. System/36 is mentioned on their corporate history page. It's a direct ancestor of the AS/400 series. The only specific information they have comes from their sales manual. * Search: http://www.ibmlink.ibm.com/ussman&parms= Our models are described this way (cribbed from above) : 5360 Multiple workstation system with multiprogramming capability. o 30 - 1432MB HDD o 128K - 7Mb RAM o 8 inch 1.2MB diskette o 36 - 72 local workstations 5362 System unit o 256K - 2MB RAM o 30 - 660MB HDD o 8 inch 1.2MB diskette o 28 local workstations o 64 remote workstations 5363 System/36 and Application Systems/Entry System Unit Compact, low-cost, floor-standing system that runs existing System/36 application programs without recompilation. o 1.0 - 2.0Mb RAM o 5.25 1.2Mb diskette o 65 - 1256Mb HDD o 28 local worstations o 64 remote worstations 5364 S/36 PC is a combination of the 5364 System Unit and a directly-attached IBM PC. The 5364 System Unit is a smaller, lower cost, floor standing or desk-top system that will run existing S/36 application programs without recompilation. The personal computer can run personal computer programs as well as act as the first S/36 workstation. o 256K - 1.0MB RAM o 5.25 inch 1.2Mb diskette o 40, 65, 80 or 130MB HDD o 6-9 local workstations (later upgraded to 16) The 5360 family has a multiple processor architecture. The main storage processor is an enhanced S/34 instruction processor. A control storage processor operates in parallel with the main storage processor, and provides microcoded control function for the I/O processors and interfaces. The processors use LSI (Large Scale Integration) for the logic circuitry. Storage technology is MOSFET (Metal Oxide semiconductor Field Effect Transistor). Data and instructions are stored as EBCDIC characters. Each EBCDIC character is stored in an 8-bit byte. ECC (Error Correction Code) is maintained in main storage. Single-bit error correction and double-bit error detection is performed on every two bytes. Parity is added for all data transfers to and from main storage. Now you know all I know. Help! Anything else would be greatly appreciated. Thanks, Colin Eby Senior Consultant CSC Consulting __________________________________________________ Do You Yahoo!? Send FREE video emails in Yahoo! Mail! http://promo.yahoo.com/videomail/