Apple 310 manual Pstrobe

C H A P T E R 1

LaserWriter Select 310 Hardware

Figure 1-3 shows the pin designations for the Centronics parallel connector and Table 1-3 lists the signal descriptions. Figure 1-4 shows the timing requirements for the Centronics interface.

Figure 1-3	A Centronics parallel connector
Pin 18			Pin 1
Pin 36			Pin 19
Table 1-3	Signal descriptions for a Centronics parallel port
Pin
number	Signal name	I/O	Description
1	/PSTROBE	I	Strobe for parallel input data
2	DATA 0	I	Data input bit 0
3	DATA 1	I	Data input bit 1
4	DATA 2	I	Data input bit 2
5	DATA 3	I	Data input bit 3
6	DATA 4	I	Data input bit 4
7	DATA 5	I	Data input bit 5
8	DATA 6	I	Data input bit 6
9	DATA 7	I	Data input bit 7
10	/PACK	O	Handshaking output signal; printer uses it to
			acknowledge receipt of parallel data
11	PBUSY	O	Busy output signal; indicates that a /PSTROBE
			signal has been received, but /PACK has not
			yet been given
12	POUT	O	Paper out; an output error signal; indicates the
			printer has run out of paper
13	Tied high	–	This select line is tied high so the LaserWriter
			Select 310 printer is always selected
14, 15, 16	Not connected	–	These lines are not connected
17	CHASSIS	–	Chassis ground
	GROUND
18	Not used	–	Not used

6 Communication Ports