This looks like a job for a Dremel, a bag of jackstands, hex nuts, and screws. I've got a Pentium system that has such a combination, as depicted here (with the serial port opening taped over). Not sure how to get more, since the search terms would be a nightmare on ebay. Also I'd change my avatar but quick if I were you.

You could knock out one of the serial port coverings in the case itself (like the ones shown at the left of Mister Xiado's picture), wire up a 9 pin DB9 port specifically for the PS/2 header and a specific serial -> PS/2 converter, and simply label it as "PS/2"

Or there's ebay... https://www.ebay.co.uk/itm/Generic-PS-2-and-S … CsAAOSwdjNZAyWe

yawetaG wrote:

You could knock out one of the serial port coverings in the case itself (like the ones shown at the left of Mister Xiado's picture), wire up a 9 pin DB9 port specifically for the PS/2 header and a specific serial -> PS/2 converter, and simply label it as "PS/2"

i would prefer to have bracket with ps2 port only and holes to use either my 25-pin serial port or parallel port, so I can use them

betamax80 wrote:

Or there's ebay... https://www.ebay.co.uk/itm/Generic-PS-2-and-S … CsAAOSwdjNZAyWe

the header on my mobo is 6 pin shaped like an upside down capital U with 4 pins in top row and 1 pin on left and right side under the 4 pins

and maybe just like bracket with the ps2 port and hole for parallel port or serial, so I can still use those ports that is already in my p133 rig

right side in pic two is the pinout on my mobo (what it looks like)

Mister Xiado wrote:

This looks like a job for a Dremel, a bag of jackstands, hex nuts, and screws. I've got a Pentium system that has such a combination, as depicted here (with the serial port opening taped over). Not sure how to get more, since the search terms would be a nightmare on ebay. Also I'd change my avatar but quick if I were you.

Pentium tower ports.jpg

where did you get it from

manage to find one and it works no issues