4800 HD  (250-3539)              Pinouts                Faxback Doc. # 1416

External Monitor Port(15-pin):         DC Connector(4-pin):

Pin    Signal                          Pin    Signal

1      Red                             1      24V   
2      Green                           2      Charge
3      Blue                            3      Not connected
4      MS2                             4      Ground       
5      Ground                       
6      Ground                          External Keyboard Port(6-pin):
7      Ground                  
8      Ground                          Pin    Signal
9      Not connected               
10     Ground                          1      KBDATA
11     MS0                             2      MSDATA 
12     MS1                             3      Ground
13     Horizontal sync.                4      VCC   
14     Vertical sync.                  5      KBCLK 
15     Not connected                   6      MSCLK 

Parallel Port(25-pin):                         Serial Port(9-pin):

Pin  Signal         Pin  Signal                Pin  Signal              

1    -Strobe        14   -Autofeed XT          1    Carrier Detect     
2    D0             15   -Error                2    Receive Data       
3    D1             16   -Init                 3    Transmit Data      
4    D2             17   -Slct in              4    Data terminal ready
5    D3             18   Ground                5    Signal ground      
6    D4             19   Ground                6    Data set ready     
7    D5             20   Ground                7    Request to send    
8    D6             21   Ground                8    Clear to send      
9    D7             22   Ground                9    Ring indicate      
10   -ACK           23   Ground          
11   Busy           24   Ground        
12   PE             25   Ground        
13   Slct         

Modem Port(14-pin):

Pin    Signal                Pin   Signal   

1      +5V                   8     Receive Data
2      Request to send       9     Data Set Ready  
3      Transmit Data         10    Carrier Detect
4      Data terminal ready   11    Speaker
5      Signal ground         12    LED indicator
6      Ring indicate         13    Mouse Data
7      Clear to send         14    Mouse clock 

Expansion Slot Port(100-pin):

Pin  Signal      Pin  Signal      Pin  Signal      Pin   Signal 

1    GND         26   SA15        51   GND         76   LA23     
2    +5V         27   GND         52   VCC         77   DRQ2     
3    NC          28   SA16        53   14.3181M    78   LA21     
4    NC          29   SA17        54   IRQ5        79   LA19     
5    NC          30   SA18        55   DRQ3        80   LA20     
6    SYSCLK      31   SA19        56   DACK3       81   DACK6    
7    IRQ3        32   SD0         57   AEN         82   GND      
8    NC          33   SD1         58   DRQ1        83   REFRESH  
9    GND         34   SD2         59   IOCHRDY     84   LA18     
10   SA0         35   SD3         60   GND         85   MASTER   
11   SA1         36   GND         61   IRQ10       86   LA17     
12   SA2         37   SD4         62   IRQ14       87   SBHE     
13   SA3         38   SD5         63   SD8         88   IOCHK    
14   SA4         39   IRQ6        64   SD9         89   MEMCS    
15   SA5         40   SD7         65   IRQ11       90   GND      
16   SA6         41   SMEWW       66   SD10        91   IOCS16   
17   SA7         42   SMEMR       67   SD11        92   DACK2    
18   GND         43   GEN         68   SD12        93   DRQ6     
19   SA8         44   IOW         69   IRQ12       94   DRQ5     
20   SA9         45   IOR         70   GND         95   DACK5    
21   SA10        46   TC          71   SD13        96   MEMR     
22   SA11        47   BALE        72   SD14        97   IRQ1     
23   SA12        48   RSTDRV      73   IRQ6        98   MEMW     
24   SA13        49   DACK1       74   SD15        99   IRQ7     
25   SA14        50   IRQ9        75   LA22        100  GND      

(rjs-06/10/93)