Elo serial touchscreen on ttyS4

[antord]

I am trying to get an J2 615 Pos which has an Elo serial touchscreen working. I have changed fro xvesa to Xorg. Installed joystick.gz to get inputattach and everything seems ok. I have preciously had it working with xubuntu but it was a bit slow and heavy to run so hence a move to tinycore. The problem I have is that the screen is set to ttys4 in ubuntu and this serialport is not listed in TC the ports go from ttyS0 to ttyS4 . I have tried   screen /dev/ttyS0 to ttyS3 but cannot get anywhere.. What am i missing.. how do  get a ttyS4 ?

I would appreciate any help..

[gerald_clark]

Your post is not clear.
Please use proper punctuation.
You say TC ports go from ttyS0 to ttyS4, Then you say you tried only ttyS0 to ttyS3 but don't have ttyS4?
Which is it.
Linux default serial driver supports ttyS0 to ttyS3.
Ports above that require a driver or a boot parameter to increase the ttys.

Try the boot code "8250.nr_uarts=8" and see if that solves the problem.