I don't suppose anyone can help, but I'll ask anyway. I have an IBM 836 Keypunch, which is similar to an 026 keypunch but has a patch panel in a pedestal to the left of the users knees. It also has three 40 pin connectors on the back panel. Does anyone know the capabilities of these? Where can I get matching plugs? The logic levels are presumably suitable for the relay logic within, but any idea what actual voltages and amperages are?