Unofficial Name: CheckLinkLines
BCALL Address: 4F4E
Checks the link port data lines to see if they match the value in A.
- A: value to check against (mask out bits 2-7)
- set 0,(iy+3Eh) if link assist is active
- Z set if link port is same value as in A
This is a pretty dumb entry point. I suppose it could be checking for a stable link. The OS link activity hook uses this.
It does nothing if 0,(iy+3Eh) is set.