Intel Celeron 2.0 GHz
Single core 32-bit

2GB RAM (2 x Crucial 1GB DDR)

Motherboard i845GV-SMC192
Video Intel Integrated 82845G

Rear:
4 x USB 2.0
3 x RJ-45 Serial
1 x Parallel
1 x VGA
1 x Ethernet 10/100
1 x 12-volt USB
1 x 24-volt USB
1 x Distributed customer display port
1 x PS/2
2 x Cash drawer connectors

Side:
2 x USB 2.0
1 x PS/2
1 x PC Card Type 2
1 x External Floppy
1 x Mic In
1 x Headphones Out

2 x USB 1.1
1 x Ethernet

ibm4840-manual.pdf

https://public.dhe.ibm.com/software/retail/poseng/surepos500/
https://theretroweb.com/chipsets/319

https://www.linuxquestions.org/questions/linux-hardware-18/ibm-surepos-4840-w-suse-10-2-touchscreen-won%27t-work-511411/
https://elosupport.elotouch.com/hc/en-us/p/Driver-Linux-Intel

https://www.freedesktop.org/wiki/Software/xinput_calibrator/

Swap out the internals with something bearable. Design adapters for display and tailgate I/O board
Side I/O could also work with an adapter
Back of case is no problem (besides PSU specific mounting method) since I do not have the original plastic back for it
3D print something after internals are settled

See https://github.com/w4b-zero/IBM_4820-48T/tree/main for a project related to another monitor model. See if documents, notes are applicable here.
High priority to get touchscreen working with adaptor. It works over serial so it shouldn't the that difficult once pinout is done and adapter is made. EloTouch drivers can be found… (see above)

130W PI Electronics from 2006 (!)
Failing fan
Proprietary cradle for locking in case
Could swap out internals with something modern