🚀 go-pugleaf

I am having trouble with a computer interface project.  I'm trying
to decode addresses on the bus for my own plug-in wire-wrap card.
So I used a 74ls688 compare chip to
decode address lines A2 to A9, and then I wired A0 and A1 to an 8255
chip.  I've wired the address to be 300hex.  I've also tried 280hex,
but I had the same problem.

My only problem seems to be that while the card is plugged
in, both of my disk drives (5 1/4, and 3 1/2) have some sort of
problem copying files to my hard drive.  When I type chkdsk at the
drive prompt, the error message 
<filename> 
 Is cross linked on allocation unit 129
etc...
And in general, I can copy only a small amount of what is stored on
the disk, and I usually get an error :sector not found on disks that
I know are good.  I'm stuck.  Any help would be very appreciated.  Thanks.