[sebhc] H8 Bus pins

[Fred11da at aol.com]

HEATHKIT H-8 BUS: Pins on the backplane were numbered 
from zero to 49,pin zero was at the bottom of the connector. 

            Pin Signal  
            ------------------
            0   Ground   
            1   Ground   
            2   -18V        
            3   /INT30   
            4   /INT40  
            5   /INT50  
            6   /INT60   
            7   /INT70   
            8   /INT10*  
            9   /INT20*  
            10  /D0      
            11  /D1      
            12  /D2      
            13  /D3      
            14  /D4      
            15  /D5      
            16  /D6      
            17  /D7      
            18  Ground*  
            19  M1       
            20  RDYIN*   
            21  IOW          
            22  Clock        
            23  MEMW         
            24  Ground* 
            25  HLDA* 
            26  IOR 
            27  HOLD* 
            28  MEMR 
            29  /RESET
            30  /A0
            31  /A1 
            32  /A2 
            33  /A3 
            34  /A4 
            35  /A5 
            36  /A6 
            37  /A7 
            38  /A8 
            39  /A9 
            40  /A10 
            41  /A11 
            42  /A12 
            43  /A13 
            44  /A14 
            45  /A15 
            46  /ROMDISABLE 
            47  +18V 
            48  +8V 
            49  +8V

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