83Plus:BCALLs:4F4E

Synopsis

Unofficial Name: CheckLinkLines

BCALL Address: 4F4E

Checks the link port data lines to see if they match the value in A.

Inputs

• A: value to check against (mask out bits 2-7)
• set 0,(iy+3Eh) if link assist is active

Outputs

• Z set if link port is same value as in A

Destroys

• All

Comments

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.