On 12/2/18 8:36 PM, Jerry Wright via cctalk wrote: [snip] Given that it was embedded in a CAT scanner it's likely a S series, not a C series (scientific vs. commercial, the latter having the commercial instruction set extensions to better support COBOL). Typically it would be a S/130, but the 16 slot chassis might make it a S/230. The legend on the CPU1 board (the bottom-most in the chassis) may give you a hint; CPU2 is the same for both the S/130 and S/230, so it's of no use it trying to sort this out. The options listed are for I/O controllers. Off the top of my head, 4010 is EIA teletype; 4042 is an oddball, it's the data channel logic sub-option for the 4040 general purpose interface. 4192 doesn't immediately ring a bell; I'll have to dig that up when I have a moment. They're not terribly interchangeable across models. Does the trashed panel have LEDs or incandescent bulbs? IIRC the S/130 was the only model that used LEDs from the factory. Does it have a DG logo on it? If so, BitSavers may have the component guide (and if not, I have a copy around here somewhere). Good luck! Cheers, Chris -- Christian Kennedy, Ph.D. chris at mainecoon.com AF6AP | DB00000692 | PG00029419 http://www.mainecoon.com PGP KeyID 108DAB97 PGP fingerprint: 4E99 10B6 7253 B048 6685 6CBC 55E1 20A3 108D AB97 "Mr. McKittrick, after careful consideration?"