2500XL/2  (250-4075)               Pinouts              Faxback Doc. # 1486

The following tables indicate the pin functions of the video connectors.

VIDEO PORT CONNECTOR PINOUT

PIN           FUNCTION

 1            Red Video
 2            Green Video
 3            Blue Video
 4            Monitor ID Bit 2 (not used)
 5            Ground
 6            Red Return (ground)
 7            Green Return (ground)
 8            Key (no pin)
10            Sync Return (ground)
11            Monitor ID Bit 0 (not used)
12            Monitor ID Bit 1 (ground)
13            Horizontal Sync
14            Vertical Sync
15            Not Used

Monochrome-type monitors use Green Video for all video input and ignore Red 
Video and Blue Video.

Monitor ID Bits are not used. The monitor type is determined when your system 
is turned on.

PERIPHERAL INTERFACES        

RS-232C serial port

PIN ASSIGNMENTS:

1 - Carrier Detect
2 - Receive Data
3 - Transmit Data
4 - Data Terminal Ready
5 - Signal Ground
6 - Data Set Ready
7 - Request To Send
8 - Clear To Send
9 - Ring Indicator

PARALLEL I/O PRINTER PORT

PIN ASSIGNMENTS

1 - Strobe
2 - Data Bit 0
3 - Data Bit 1
4 - Data Bit 2
5 - Data Bit 3
6 - Data Bit 4
7 - Data Bit 5
8 - Data Bit 6
9 - Date Bit 7
10 - ACKNOWLEDGE
11 - BUSY
12 - PAPER END
13 - SELECT
14 - AUTO FEED
15 - ERROR
16 - INITIALIZE
17 - SELECT IN
18-25 - GROUND

KEYBOARD, MOUSE, AND AUXILIARY
DEVICE CONNECTORS
 
PIN ASSIGNMENTS:

1 - Data
2 - Reserved
3 - Ground
4 - +5 Vdc
5 - Clock
6 - Reserved