It's what Latiodile said. Someone probably repaired traces on that board at some point. The soldermask encases the repair work, so that it's not easily disturbed/undone.
Unrelated:
I see no HDD controller onboard. Do you have a controller ISA card? My 80386SX based computer has one (and 8MB of RAM).
Unfortunately most of this old stuff is dying or already completely broken. Even if the mainboard is still working. AT power supplies are waaaay too old by now and often leave us with a last sad spark.
Today I brought a complete series of 850MB WD Caviar HDDs from 1996 to the junkyard (with a lot of other scrap). Few HDDs from that time are working normally (and often BIOS won't accept more than 500MB).
An Adaptec ISA card might be an alternative for using SCSI drives (HDD, optical drives, tape drives).
It would be interesting to know how you build your retro PC.
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