TANDY 1000 TL/3  (250-1603)           Pinouts           Faxback Doc. # 1244

Video Port Connector:                RS-232C Serial Port Connector:
                                  
Pin    Function                      Pin    Function 

 1     Ground                         1     Carrier Detect  
 2     Ground                         2     Receive Data
 3     Red Video                      3     Transmit Data
 4     Green Video                    4     Data Terminal Ready
 5     Blue Video                     5     Signal Ground
 6     Intensity                      6     Data Set Ready
 7     Green Video                    7     Request To Send
 8     Horizontal Synch               8     Clear To Send
 9     Vertical Synch                 9     Ring Indicator

Monitor voltage levels are TTL-standard.

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

Parallel I/O Port Connector:

Pin     Function                     Pin     Function

 1      Strobe                        10     Acknowledge                  
 2      Data Bit 0                    11     Busy
 3      Data Bit 1                    12     Paper End
 4      Data Bit 2                    13     Select
 5      Data Bit 3                    14     Auto Feed
 6      Data Bit 4                    15     Error
 7      Data Bit 5                    16     Initialize
 8      Data Bit 6                    17     Select In
 9      Data Bit 7                    18-25  Ground

Joystick Port Connectors:

Left Joystick:                        Right Joystick:   

Pin     Function                      Pin     Function

 1      Position 1                     1      Position 3
 2      Position 2                     2      Position 4
 3      Ground                         3      Ground
 4      Switch 1                       4      Switch 3
 5      Power                          5      Power
 6      Switch 2                       6      Switch 4

*Joystick port locations are controlled through I/O ports 200-207.