my name is Marco, I'm from Italy and just joined both this forum and the community of TRS-80 owners.
I'm totally new to the machine but getting fast to deepen my knowledge about programming it.
As many latecomers I struggled to bring old software found on the web on 5.25 floppy disks and decided to buy an HxC emulator (which is set to arrive in the next couple of weeks) to connect as the third drive to be kept external. While waiting for the emulator to arrive, I had a look at the best way to connect it to the Model 4 and got a big question mark floating over my head: where there should be a PCB connector under the chassis I just have a hole (photo here below)! I'm pretty sure the machine has not been modified, yet the connector is not there. Moreover the general port layout is different from that depicted in the manual. Am I missing something?
here what I should find according to the manual

and here my layout

as you can see the hole is just... a hole.

Also, I'm struggling at finding a clamp-on PCB connector for flat cables (it seems nowadays they just have tons of IDC ones); where did you buy yours?
Thanks in advance for any help.
M.