Section 4
Serial Controller
4.22
EXAMPLES
PRINT#1,"ASSERT SRQ"
assert the SRQ line
PRINT#1,"ASSERT ATN REN DATA &H54"
send the bus command TAG20 (Talk Address Group 20)
PRINT#1,"ASSERT DATA &H1F"
assert data lines 5 through 1, leaving lines 6, 7, and 8 unchanged