Depends on if you are talking about the male or the female part.
Dave talks about female.

SER1 and SER2 - PC style serial connectors. 2 - RxD 3 - TxD 4 - DTR 5 - GND 8 - CTS 9 - +12V via resistor. But I see different between SER1 ( J6 ) and SER2 ( J5 ) on Issue 6 board: RxD and CTS - input for SER2 but output for SER1, TxD and DTR - output for SER2 but input for SER1 ). I'm a little con...

See THIS THREAD

FLP_USE FDD : REMark Temporary Device for FLP
DEV_USE 1,"win1_sys_" : REMark Point Dev1_ to sys directory
DEV_USE FLP : REMark DEV is now FLP

I'm trying to think of ways to back-up the data on my Spectrum Microdrives once I re-felt them, assuming that the vDriveQL can't talk to an Interface 1 (once it arrives). I have what I believe is paper printout of the source of routines for reading a ZX Spectrum formatted microdrive cartridge on a ...

This one fits better to the QL.
https://www.thingiverse.com/thing:2853469

tschak909 wrote:II don't understand, from what I see, ser1 and ser2 literally are two of the same connector?

But the wiring is different. One is DCE and one is DTE.

connecting the QL serial port to another computer with internet access ? http://www.linuxcertif.com/man/1/tcpser/en/ TCPser on Linux computer or raspberry. I also had experiment with new modem, based on ARM board instead on ESP8266 (targeted to Atari ST, Acorn and possibly QL), but not tested on QL...

1.) Scart or Composite Video Cable https://www.ebay.co.uk/itm/Sinclair-QL-High-Quality-RGB-Scart-Lead-Video-Cable-TV-Lead-SGC-Compatible-/260814300633 3.) Floppy Disk Interface Unit Choose one: https://www.sellmyretro.com/search?keyword=ql+interface+tetroid&phraseType=allWords&countryId=&am...

[2] Copied sysvars, and system tables to screen0, as shown earlier. Not necessary. VideoRAM is not bank switched. Pointer to start of video memory swaps between two various addresses. I am surprised to see some visual activity at the top 5-10 lines after switch to screen1, while when at screen0 the...

Absolutely.