Hi all, More progress on the 4051. I finally tracked down the original manuals and was able to get them. Man, are they in sorry shape. Not just mold and mildew but even termites in them! I spent all day cleaning them page by page. I was able to save most of them. The worst damage is confined to the outer pages and the edges so most of the real info is intact. Here's what I ended up with, besides the two books that I mentioned early. (Book 1) 4051 Service ROM Pack 067-0962-00, 4051R05 Binary Program Loader, 4051E01 ROM Expander Instruction Manual, 4051 Option 1 Data Communications Interface 021-0188-00, Data Communications Inteface Unit Instruction Manual 021-0065-00, 4051 Option 10 RS-232 Printer Interface 021-0189-00. (Book 2) Graphic System Reference Manual 070-2056-00 (Book 3) 4051 Graphic System Service Manual Vol I 070-2065-00, 4051 Graphic System Service Manual Vol II 070-2086-00, RS 232 Printer Interface for 4051 (data sheet) 021-0189-00, 4051R01/4051R05/4051R06 data sheet 062-3106-00. (Book 4) 4907 File Manager Operator's Manual 070-2360-00. (Book 5) Plot 50 ????? (title page missing), Plot 50 Introduction to Graphic Programming in BASIC 070-2059-00. (Book 6) 4051 Editor 4051R06 070-2170-00. BTW Paxton and Phillip were right, the model of the disk drives is 4907 not 4097. Happy weekend everybody and happy Thanksgiving to the ones of us here in the US. Joe