is@beverly.rhein.de writes:

>:  (3) 4 bits output (STROBE, AUTOLF, INIT, SELECT)

>The STROBE pin on the Amiga parallel port is automatically set active
>when data is written to the output register, and can only be cleared at
>will. 

The strobe pin is actually pulsed for about one or two microseconds
after you read or write the data register.

>:  (5) 1 special bit input (ACK) which can be tied to an interrupt

The Amiga generates an interrupt on the low-high-transition of that
input and you cannot sense the state of the line.

Regards,
-- 
                                Michael van Elst

Internet: mlelstv@serpens.rhein.de
                                "A potential Snark may lurk in every tree."