SX1 Modification

[xArtx]

Hi Guys,
I found this protoboard in my SX1



I know what the logic is, but don’t know what whomever it was is doing here,
other than noticing 4000 and 74LS logic is potentially mixed and in a plastic bag :O
74LS02 - Quad 2 input NOR
4093 - Quad 2 input NAND Schmidt trigger

Any ideas?

The ribbon all five leads are directly to the external floppy connecter DB23 footprint,
but tracks aren’t cut so it doesn’t look like it can be buffering anything.
Until I know what it’s doing I’ll stick to the external drive supplied with it.
There’s enough thought behind it to have done it all fairly neat.
Cheers, Art.


EDIT,,,
underside floppy conector footprint: