WimWalther
Experienced Member
For the last 25-30 years, we typically find D-sub 9pin Male connectors used for computer-side serial port connections. Older machines would occasionally have both 9 & 25pin Male connectors though some would only have the 25pin Male.
But further yet, back in time, and it seems that D-Sub 25pin Female connectors were a standard.. I see this setup on the VIC-1011A RS-232 adapter for C64 & VIC-20 as well as the Tandy 1000EX / HX RS-232 PLUS card - despite the fact that those machines are from the late 80s.
So who put these various standards in-place, assuming there were any. Well obviously, there were certainly some as the numeric pinout of the different size & gendered ports seem to usually match up.
But further yet, back in time, and it seems that D-Sub 25pin Female connectors were a standard.. I see this setup on the VIC-1011A RS-232 adapter for C64 & VIC-20 as well as the Tandy 1000EX / HX RS-232 PLUS card - despite the fact that those machines are from the late 80s.
So who put these various standards in-place, assuming there were any. Well obviously, there were certainly some as the numeric pinout of the different size & gendered ports seem to usually match up.