Jay said: I thought I might be able to help here, but about all I have found is an explanation of the DG part number system. The book says: part numbers have the following format 001 - 000573 - 10 PREFIX ITEM NO. REVISION LEVEL I. PREFIX The first three digits of the number are the prefix. The prefix indicates the general class of a document or part. In this example, the prefix 001 indicates that this number refers to a logic schematic. A list of all the current prefixes follows this expalnation. II. ITEM NUMBER Digits 4-9 are the item number that uniquely identifies the particular item in the class. In this example, the number 573 refers to the schematic for the power supply of the 6020 series tape drive. III. SUFFIX The last two digits are the revision level. In this case, 10 refersto the number of times this particular schematic has been changed.... Following this explanation is a list of Prefix codes from 001 to 220. code 107 is ARTWORK PCB After this I looked through the documentation for the S/130 and found that your board appears to be in fact the CPU-1 board from an S/130...item 000261. CPU-2 should have item number 000657 I think you'd better go back and dig through the bin some more!!! regards, Dan