Orkay wrote:For starters, you could just slap some strips of electrical tape over them.
Or create a pair of blanking plates.
Measure the following distances:
(A) Topmost edge of the upper hole to bottom most edge of lower hole.
(B) Distance between two adjacent holes.
(C) Distance between the mounting holes for one connector
Find a piece of metal which is (A+B) long and (C) wide.
Gaffer tape the plate inside the case, and then from the outside make four marks on the plate for the two topmost and bottommost mounting holes.
Drill holes
Fasten plate inside case with 4 off M3 nuts and bolts (or whatever the imperial/customary equivalent is)
If you need to use one of the holes in the future remove the plate, slide it along and refasten to liberate a hole.
Said plate could also be drilled to accept a panel mounting PS/2 mouse connector...
The 9way holes could be used to mount a pair of USB sockets stolen from a rear slot mounting plate - if you do that just fill the third hole with DE9 connector.