[SOLVED] What are each of these sockets?

[kook]

What are the technical names of each of these 4 sockets on this old computer from like 1990?

https://imgur.com/MHi0NKb

View: https://i.imgur.com/MHi0NKb.jpg

https://imgur.com/iaFxNSE

View: https://i.imgur.com/iaFxNSE.jpg

I suppose the first one is VGA for a monitor, the second is for a printer and the other two are for monitors too but what are the exact names?

 

[kanewolf]

First picture
Custom??? Video port, Parallel port, serial port, serial port
Looks like this was a point of sale terminal or special purpose CPU.

 

[kook]

First picture
Custom??? Video port, Parallel port, serial port, serial port
Looks like this was a point of sale terminal or special purpose CPU.

Thank you. Custom video port? Don't you think it's VGA or something? It looks similar to me at least.
Eventually I want to get an adapter so that I can see the computer's output without the CRT monitor that isn't really working.
Perhaps I could get an adapter for the serial port? Note that there's this symbol between the two serial ports:

https://imgur.com/fBZDyvg

View: https://i.imgur.com/fBZDyvg.png

Doesn't that mean "display"?

 

[CountMike]

VGA (Analog, RGB display/monitor port)
Parallel port (Centronics 25 pin) IEE 1284.
Serial port 9pin( there was also a 25 pin one which was same as parallel but female), most popular was RS 232, RS 485, RS 422 but there were others.
Both of them had several uses, for printers modems etc.
Below them, proprietary (I believe HP) expansion port. Forerunner of USB and Firewire (IEE 1394)

 

[kanewolf]

hank you. Custom video port? Don't you think it's VGA or something? It looks similar to me at least.

I only say "Custom?" because one of the pins looks blocked off. Not a standard VGA.

 

[kook]

I only say "Custom?" because one of the pins looks blocked off. Not a standard VGA.

You are right. That is actually a 14-pin VGA port and it's almost impossible to find any adapter for it.

 

[Krotow]

You are right. That is actually a 14-pin VGA port and it's almost impossible to find any adapter for it.

Yep, that is the one. First VGA adapters didn't used pin 9. It got in use later when newer monitors started to provide available video modes and refresh rates over VESA DCC protocol.

https://helpfulcolin.com/14-pin-15-pin-vga-cables-their-uses/