Were there many peripherals which used 9 pin DIN connector, rather than the modified BT phone plug?Peter wrote:[
That would also make it fully compatible to Q40, Q60 and Q68. Still I'm reluctant to recommend the PC pinout - I understand the Tx as a strict retro board, so it makes some sense to keep original QL equipment like printers, printer interfaces or QL-taylormade serial cables directly usable.
Myself I would think that using a standard 9 pin RS232 pin-out would allow the use of standard, off the peg cables.