4020 LX  (250-5120)               Pinouts               Faxback Doc. # 1586

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         Blue Return (ground)
 9         Key (no pin)
10         Sync Return (ground)
11         Monitor ID Bit 0 (not used)
12         Monitor ID BIT 1 (not used)
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.

Video Feature Edge Connector Pinout:

Pin         Function

Front (Component) Side of the Adapter

Y1          CO (Color Bit 0)
Y2          C1 (Color Bit 1)
Y3          C2 (Color Bit 2)
Y4          C3 (Color Bit 3)
Y5          C4 (Color Bit 4)
Y6          C5 (Color Bit 5)
Y7          C6 (Color Bit 6)
Y8          C7 (Color Bit 7)
Y9          DAC Clock
Y10         DAC Blanking
Y11         Ext. Horizontal Sync
Y12         Ext. Vertical Sync
Y13         Ground

Pin         Function

Z1          Ground
Z2          Ground
Z3          Ground
Z4          Select Internal Video
Z5          Select Internal Syncs
Z6          Select Internal DAC
Z7          Not Used
Z8          Ground
Z9          Ground
Z10         Ground
Z11         Ground
Z12         Not Used
Z13         Not Used

Peripheral Interfaces:

RS-232 Serial Port:

Pin Assignments:

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

Parallel I/O Printer Port (25-Pin Connector)

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     Data 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
(/tmc-05/02/95)