Commodore Amiga A500 Technical Reference Manual page 135

INITIALIZE PRINTER (AH
=
01 H)
INPUT: D X
=
Printer Status Port address
=
(Printer Table contents
+
1 )
OUTPUT: AH
=
Printer Status
RETURN PRINTER STATUS (AH
=
02H)
INPUT:
DX
=
Index t o Printer table port
+
1
(the Status port)
CH must have correct value of timeout flag
OUTPUT: AH
=
Printer Status:
>
Printer timeout
>
not used
>
not used
>
I10 Error (Pin 15 Inverted)
>
Selected (Pin 13)
>
Out of Paper (Pin 12)
>
Acknowledge (Pin 10 Inverted)
L
>
Not Busy
(Pin l I Inverted)
Notes: Pins
#S
are those on a 25 pin D connector
ROM BASIC ENTRY VIA S / W INT 18H
Not able t o boot diskette, go t o Monitor, error message o r a ROM
BASIC
BOOT FROM DISKE7TE VIA S / W INT 19H
***
B O O T D I S K E T T E
***
If boot attempt fails:
Fall through t o user routine INT 18h, which might be a monitor o r a
ROM BASIC, an error message etc.
Should INT 18h return, which is unlikely, we'll return t o caller of INT
19h.