Hi, Does anybody have the schematics for the pre-1971 versions of these : M715 C reader clock Flipchip card, M710 D punch control Flipchip card, M 705 D reader control Flipchip card ? While trying to connect my PDP-8/L to the PC04 fast reader/puncher, I realized that the schematics for the M705, M710 and M715 card posted by David Gesswein http://www.pdp8.net/pdp8cgi/query_docs/queryb.pl?level=1m-series;id=689 did not correspond to the ones I have. These are late "F" versions (1971). These cards include several DEC9801 one-shot TTLs as well as 7475 TTLs. My cards are 1969 versions and have no 9801 nor 7475. My cards have been somewhat modified by the former owner of the PDP-8/L. I have to understand what he did in order to repair them (most cards have to be repaired because an overvoltage episode killed about one third of the TTLs in my PDP-8/L) ! Many thanks, Philippe .