TANDY 2000 HD  (260-5104)             Pinouts           Faxback Doc. # 1954

GND = Ground     NC = Not Connected     * = Active Low Signal

Printer - 34 pin header:               Floppy - 34 pin card socket:

1  Strobe*          2  GND             1  GND            2  NC
3  Data 0           4  GND             3  GND            4  In Use*
5  Data 1           6  GND             5  GND            6  NC
7  Data 2           8  GND             7  GND            8  Index*
9  Data 3           10 GND             9  GND            10 Drive Select 0*
11 Data 4           12 GND             11 GND            12 Drive Select 1*
13 Data 5           14 GND             13 GND            14 NC
15 Data 6           16 GND             15 GND            16 Motor On*
17 Data 7           18 GND             17 GND            18 Direction*
19 Acknowledge*     20 GND             19 GND            20 Step*
21 Busy             22 GND             21 GND            22 Write Data*
23 Paper Out        24 GND             23 GND            24 Write Enable*
25 Select* (busy*)  26 Strobe In       25 GND            26 Track 0*
27 GND              28 Fault*          27 GND            28 Write Protect*
29 In 0             30 In 1*           29 GND            30 Read Data*
31 GND              32 In 2            31 GND            32 Side Select*
33 GND              34 Buffer Full     33 GND            34 Drive Ready*

Keyboard - 5 pin DIN:    Monochrome - 8 pin DIN:   Serial Port - DB-25 Female:

1  Keyboard Data         1  NC                     1  GND
2  Keyboard Busy*        2  GND                    2  Transmit Data
3  GND                   3  Intensity              3  Receive Data
4  Keyboard Clock*       4  Horizontal Sync        4  Request to Send
5  +5V                   5  Vertical Sync          5  Clear to Send
                         6  NC                     6  Data Set Ready
Power Connector (2):     7  Video Signal           7  Signal Ground
                         8  NC                     8  Carrier Detect
1  +12V  (orange)                                  9  NC
2  GND   (black)         Speaker - 2 pin header:   10 NC
3  GND   (black)                                   11 NC
4  +5V   (red)           1  Sound    2  GND        12 NC
                                                   13 NC
Color Monitor on         Mouse Interface on        14 NC
Graphics Board:          Digi-Mouse Board:         15 Transmit Clock
                                                   16 NC
1  GND                   1  GND                    17 Receive Clock
2  GND                   2  +5V                    18 NC
3  Red                   3  Switch 3*              19 NC
4  Green                 4  X-Axis Phase A         20 Data Terminal Ready
5  Blue                  5  X-Axis Phase B         21 NC
6  Intensity             6  Switch 2*              22 Ring Indicator
7  NC                    7  Switch 1*              23 NC
8  Horizontal Sync       8  Y-Axis Phase A         24 NC
9  Vertical Sync         9  Y-Axis Phase B         25 NC