Atari 520ST - Peripheral Port Pinout Details

////////////////
Printer
1
—
STROBE
2
—
Data 0
3
—
Data 1
4
—
Data 2
5
—
Data 3
6
—
Data 4
7
—
Data
5
8
—
Data 6
9
—
Data 7
10
—
Not
Connected
13 12 11 10
9
8
7 6 5
4
3 2
1
V.v.v.v.v.-.v/
25
24
23 22
21
20 19 18 17 16 15 14
1 1
—
BUSY
12-17
—
Not
Connected
18-25
—
Ground
Modem
1
—
Protective Ground
2
—
Transmitted Data
3
—
Received
Data
4
—
Request
to
Send
5
—
Clear
to Send
6
—
Not Connected
7
—
Signal
Ground
8
—
Data Carrier Detect
9-19
—
Not Connected
20
—
Data
Terminal
Ready
1
2 3
4
5 6
7
8 9
10 11
12 13
14
15 16
17 18
19
20 21
22 23
24
25
21
—
Not Connected
22
—
Ring Indicator
23-25
—
Not
Connected
Floppy Disk
1
—
Read Data
2
—
Side
0
Select
3
—
Logic Ground
4
—
Index Pulse
5
—
Drive
0
Select
6
—
Drive 1 Select
7
—
Logic Ground
8
—
Motor On
9
—
Direction
In
10
—
Step
1 1
—
Write Data
12
—
Write
Gate
13
—
Track
00
14
—
Write Protect
i
C
C
c
c
c
c
G
c
c
c
c
c
c
c
c
c
£
*
c
c
c
c
G
c
c
Q
c
c
c
c
c
76