no, there is no seperate opening for a connector this size. on some drawings you might see one, but there isn't - at least in my case. on the back, you can only remove the black port filler cover. https://photos.app.goo.gl/9ENJxB5KimmXopvj6
- but maybe they built a filler plate with a p1 port opening?
guess the p1 port is there for debugging reasons, some traces go directly to the 27F4620, but finding a data sheet - ha-ha :) However, this chip is also used in other ps/2, so it might be possible that there is at least a serial port. would be the first that comes into my mind: serial console.
interesting side notes so far:
- the base + cover + front + HDD shield + rails + mca covers + speaker/led/switch assembly are 1:1 the same as the 8590
- led for a hdd is built in (the expenses!!!)
- putting in a XGA2 does absolutely nothing (yeah, had to do this, i was curious) - guess they took all unnecessary i/o out of the bios
- clock battery (yes, a dallas) is still intact
- the originally supplied networking card is 32bit, but the mca-slots are only 16bit (yep, 386sx...)
- the floppy drive appears to be in working condition. my first functional drive in a ps/2 so far :]
- machine is dated 1997 - guess that explains the 32bit card (but not that 386SX) :)