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Standard PC Storage Devices and I/O Connector Pinouts.




                                  

                  This information may be shared freely but not sold for profit!                       
                  This data is provided in a text format to allow greater ease
                  of formatting into existing technical documents.
         
                  This information compiled and provided by                  
                  Dick Perron   dperr@randomc.com                            
                                       
                              Standard PC storage devices and
                              I/O connector pinouts.
                                                        
                                  FDD 34 pin connector
                            IDE 40 pin and 44 pin connector
                             RLL/MFM disk drive connectors                            
                               ESDI disk drive connectors
                                ISA/EISA I/O connectors
                                VESA local bus connector
                                PCI local bus I/O pinouts
                                   30 pin SIMM pinouts
                                   72 pin SIMM pinouts

                            FLOPPY DISK 34 PIN CABLE PINOUT

               2--LDENSEL#       4--Microfloppy   6--EDENSEL      8--INDX#        10-MTEN1#
               12-DRSEL0#        14-DRSEL1#       16-DTEN0#       18-DIR#         20-STP#
               22-WRDATA#        24-WREN#         26-TRK0#        28-WRPRDT#      30-RDDATA#
               32-HDSEL1#        34-DSKCHG#
       
               All ODD numbered pins are grounded.

               Note!!  Pin 34 is the disk change interrupt line.  If the cable is "cocked" on
                       the connector you may not detect the change when u insert a new disk in the drive.
                       A DOS DIR command will always show the contents of the first disk installed.
               
             34 PIN IDC EDGE SOCKET CONNECTOR                           34 PIN DIL SOCKET CONNECTOR
                   34              2                                      1              33
                   -----------------                                      ooooooooooooooooo
                   -----------------                                      ooooooooooooooooo
                   33              1                                      2              34

             Edge connectors and IDC connectors are mounted on opposite sides of the ribbon cable in order
             to orient pin #1 correctly and this is why you have to twist the cable between the 5.25" drive
             and the 3.5" drive.  You will see this on "universal" FDD cable sets.


           3.5" IDE/EIDE DISK DRIVE CABLE 40 PIN AND 2.5" 44 PIN MALE DUAL INLINE COMNECTOR

                          43   39                              1 K C A
                           o o o o o o o o o o o o o o o o o o o E o o
                           o o o o o o o o o o o o o o o o o o o Y o o 			
                          44   40                              2   D B
   
                A--MFG USE      B--MFG USE      C--MFG USE      D--MFG USE 
                1--Reset        2--GND          3--HD7          4--HD8          5--HD6
                6--HD9          7--HD5          8--HD10         9--HD4          10-HD11
                11-HD3          12-HD12         13-HD2          14-HD13         15-HD1
                16-HD14         17-HD0          18-HD15         19-GND          20-KEY
                21-RESVD        22-GND          23-IOW#         24-GND          25-IOR#
                26-GND          27-IORDY#       28-ALE          29-RESVD        30-GND
                31-IRQ14        32-IO16#        33-HA1          34-RESVD#       35-HA0
                36-HA2          37-CS0#         38-CS1#         39-DRAC#        40-GND
                41-+5V Logic    42-+5V Motor    43-Gnd          44-TYPE ((0=ATA)

                Note!!  Pins 37 and 38 are used for the cable select option.
                If the CS option is enabled the drive # will be determined 
                by whether the drive is attached to the first or second
                connector on the cable. A special cable is needed to utilize
                the cable select option.
                
                If the cable does not have pin 20 keyed then pin #1 on the cable is determined
                by the RED stripe on the edge of the cable.
                
                The control signals are the same for the 40 pin and 44 pin cable.
                The 44 pin socket is a 50 pin connector with two pins removed to clear the wall
                of the connector socket.  Pins A-D at the drive end are reserved for MFG use and
                are NOT connected to the host through the cable.

                     RLL/MFM  HARD DISK IDC-34 Male and IDC-20 Male
                                     
                               RLL/MFM IDC-34 CONTROL CABLE
                      pin     Signal          pin       Signal
                       1       GND             2       Head Sel 8
                       3       GND             4       Head Sel 4
                       5       GND             6       Write Gate
                       7       GND             8       Seek Complete
                       9       GND             10      Track 0
                       11      GND             12      Write Fault
                       13      GND             14      Head Sel 1
                       15      GND             16      (reserved)
                       17      GND             18      Head Sel 2
                       19      GND             20      Index
                       21      GND             22      Ready
                       23      GND             24      Step
                       25      GND             26      Drive Sel 1
                       27      GND             28      Drive Sel 2
                       29      GND             30      Drive Sel 3
                       31      GND             32      Drive Sel 4
                       33      GND             34      Direction In

                                RLL/MFM IDC-20 DATA CABLE
                      pin     Signal          pin     Signal
                       1       Drive Selected  2       GND
                       3       (reserved)      4       GND
                       5       (reserved)      6       GND
                       7       (reserved)      8       GND
                       9       (reserved)      10      (reserved)
                       11      GND             12      GND
                       13      Write Data+     14      Write Data-
                       15      GND             16      GND
                       17      Read Data+      18      NRZ Read Data-
                       19      GND             20      GND

		
		ESDI 34 PIN CONTROL CABLE AND 20 PIN DATA CABLE PINOUTS

                                ESDI IDC-34 CONTROL CABLE
                      pin     Signal            pin       Signal
                       1       GND               2       Head Sel 3
                       3       GND               4       Head Sel 2
                       5       GND               6       Write Gate
                       7       GND               8       Config/Stat Data
                       9       GND               10      Transfer Ack
                       11      GND               12      Attn 
                       13      GND               14      Head Sel 0
                       15      GND               16      Sect/Add MK Found
                       17      GND               18      Head Sel 1
                       19      GND               20      Index
                       21      GND               22      Ready
                       23      GND               24      Trans Req
                       25      GND               26      Drive Sel 1
                       27      GND               28      Drive Sel 2
                       29      GND               30      Drive Sel 3
                       31      GND               32      Read Gate
                       33      GND               34      Command Data

                                   ESDI IDC-20 DATA CABLE
                      pin      Signal            pin         Signal
                       1       Drive Selected    2       Sect/Add MK Found
                       3       Seek Complete     4       Addr Mark Enable
                       5       (reserved)        6       GND
                       7       Write Clk+        8       Write Clk-
                       9       Cartridge Chng    10      Read Ref Clk+
                       11      Read Ref Clk-     12      GND
                       13      NRZ Write Data+   14      NRZ Write Data-
                       15      GND               16      GND
                       17      NRZ Read Data+    18      NRZ Read Data-
                       19      GND               20      GND


                      SCSI CONNECTOR PINOUTS (Single Ended) IDC-50 MALE
              pin    Signal     pin    Signal   pin    Signal   pin   Signal
              01      GND       02     -DB0     27     GND     |28     GND
              03      GND       04     -DB1     29     GND     |30     GND
              05      GND       06     -DB2     31     GND     |32     -ATN
              07      GND       08     -DB3     33     GND     |34     GND
              09      GND       10     -DB4     35     GND     |36     -BSY
              11      GND       12     -DB5     37     GND     |38     -ACK
              13      GND       14     -DB6     39     GND     |40     -RST
              15      GND       16     -DB7     41     GND     |42     -MSG
              17      GND       18     -DBP     43     GND     |44     -SEL
              19      GND       20     GND      45     GND     |46     -C/D
              21      GND       22     GND      47     GND     |48     -REQ
              23      GND       24     GND      49     GND     |50     -I/O
              25      (open)    26     TERMPW  

                     SCSI CONNECTOR PINOUTS (Differential) IDC-50 MALE
              pin    Signal     pin    Signal   pin    Signal   pin    Signal
              01      (open)    02      GND     27      GND     28      GND
              03      +DB0      04      -DB0    29      +ATN    30      -ATN
              05      +DB1      06      -DB1    31      GND     32      GND
              07      +DB2      08      -DB2    33      +BSY    34      -BSY
              09      +DB3      10      -DB3    35      +ACK    36      -ACK
              11      +DB4      12      -DB4    37      +RST    38      -RST
              13      +DB5      14      -DB5    39      +MSG    40      -MSG
              15      +DB6      16      -DB6    41      +SEL    42      -SEL
              17      +DB7      18      -DB7    43      +C/D    44      -C/D
              19      +DBP      20      -DBP    45      +REQ    46      -REQ
              21      DIFFSENS  22      GND     47      +I/O    48      -I/O
              23      GND       24      GND     49      GND     50      GND
              25      TERMPWR   26      TERMPWR

                  Macintosh SCSI Connector Pinouts (Single Ended) DB-25S Female
              pin    Signal    pin    Signal   pin    Signal   pin     Signal
              01     -REQ      08     -DB0     14       GND    20      -DBP
              02     -MSG      09      GND     15      -C/D    21      -DB1
              03     -I/O      10     -DB3     16       GND    22      -DB2
              04     -RST      11     -DB5     17      -ATN    23      -DB4
              05     -ACK      12     -DB6     18       GND    24       GND
              06     -BSY      13     -DB7     19      -SEL    25       NC (TERMPWR)
              07      GND




                              ISA/EISA I/O CONNECTOR PIN ASSIGNMENTS
                
                ISA Bus Connector              EISA Bus Connector
                -----------------              ------------------
                Etch Side      Component Side  Etch Side       Component Side
                pin Signal     pin  Signal     pin Signal      pin Signal
                B1  GND        A1   CHCHK#     F1  GND         E1  CMD#
                B2  Reset DRV  A2   SD7        F2  +5V         E2  START#
                B3  +5V        A3   SD6        F3  +5V         E3  EXRDY
                B4  IRQ9       A4   SD5        F4  ---         E4  EX32#
                B5  -5V        A5   SD4        F5  ---         E5  GND
                B6  DRQ2       A6   SD3        F6  ACCESS KEY  E6  ACCESS KEY
                B7  -12V       A7   SD2        F7  ---         E7  EX16#
                B8  NOWS#      A8   SD1        F8  ---         E8  SLBURST#
                B9  +12V       A9   SD0        F9  +12V        E9  MSBURST#
                B10 GND        A10  CHRDY      F10 M/IO#       E10 W/R#
                B11 SMWTC#     A11  AEN        F11 LOCK#       E11 GND
                B12 SMRDC#     A12  SA19       F12 (reserved)  E12 (reserved) 
                B13 IOWC#      A13  SA18       F13 GND         E13 (reserved)
                B14 IORC#      A14  SA17       F14 (reserved)  E14 (reserved)
                B15 DACK3#     A15  SA16       F15 BE3#        E15 GND
                B16 DRQ3       A16  SA15       F16 ACCESS KEY  E16 ACCESS KEY
                B17 DACK1#     A17  SA14       F17 BE2#        E17 BE1#
                B18 DRQ1       A18  SA13       F18 BE0#        E18 LA31#
                B19 REFRESH#   A19  SA12       F19 GND         E19 GND
                B20 BCLK       A20  SA11       F20 +5V         E20 LA30#
                B21 IRQ7       A21  SA10       F21 LA29#       E21 LA28#
                B22 IRQ6       A22  SA9        F22 GND         E22 LA27#
                B23 IRQ5       A23  SA8        F23 LA26#       E23 LA25#
                B24 IRQ4       A24  SA7        F24 LA24#       E24 GND
                B25 IRQ3       A25  SA6        F25 ACCESS KEY  E25 ACCESS KEY
                B26 DACK2#     A26  SA5        F26 LA16        E26 LA15
                B27 T/C        A27  SA4        F27 LA14        E27 LA13
                B28 BALE       A28  SA3        F28 +5V         E28 LA12
                B29 +5V        A29  SA2        F29 +5V         E29 LA11
                B30 OSC        A30  SA1        F30 GND         E30 GND
                B31 GND        A31  SA0        F31 LA10        E31 LA9
                                               
                                               H1  LA8         G1  LA7
                D1  M16#       C1  SBHE#       H2  LA6         G2  GND
                D2  IO16#      C2  LA23        H3  LA5         G3  LA4
                D3  IRQ10      C3  LA22        H4  +5V         G4  LA3
                D4  IRQ11      C4  LA21        H5  LA2         G5  GND
                D5  IRQ12      C5  LA20        H6  ACCESS KEY  G6  ACCESS KEY
                D6  IRQ15      C6  LA19        H7  D16         G7  D17
                D7  IRQ14      C7  LA18        H8  D18         G8  D19
                D8  DACK0#     C8  LA17        H9  GND         G9  D20
                D9  DRQ0       C9  MRDC#       H10 D21         G10 D22
                D10 DACK5#     C10 MWTC#       H11 D23         G11 GND
                D11 DRQ5       C11 SD8         H12 D24         G12 D25
                D12 DACK6#     C12 SD9         H13 GND         G13 D26
                D13 DRQ6       C13 SD10        H14 D27         G14 D28
                D14 DACK7#     C14 SD11        H15 ACCESS KEY  G15 ACCESS KEY
                D15 DRQ7       C15 SD12        H16 D29         G16 GND
                D16 +5V        C16 SD13        H17 +5V         G17 D30
                D17 MASTER16#  C17 SD14        H18 +5V         G18 D31
                D18 GND        C18 SD15        H19 MAKx        G19 MREQx
  
                       VESA LOCAL BUS (VLB) I/O CONNECTOR
                                 
               Etch side      Component Side  Etch Side       Component Side
               pin Signal     pin Signal      pin Signal      pin  Signal
               B1  Dat00      A1  Dat01       B30 Adr17       A30 Adr16
               B2  Dat02      A2  Dat03       B31 Adr15       A31 Adr14
               B3  Dat04      A3  GND         B32 Vcc         A32 Adr12
               B4  Dat06      A4  Dat05       B33 Adr13       A33 Adr10
               B5  Dat08      A5  Dat07       B34 Adr11       A34 Adr08
               B6  GND        A6  Dat09       B35 Adr09       A35 GND
               B7  Dat10      A7  Dat11       B36 Adr07       A36 Adr06
               B8  Dat12      A8  Dat13       B37 Adr05       A37 Adr04
               B9  Vcc        A9  Dat15       B38 GND         A38 WBACK#
               B10 Dat14      A10 GND         B39 Adr03       A39 BEO#
               B11 Dat16      A11 Dat17       B40 Adr02       A40 Vcc
               B12 Dat18      A12 Vcc         B41 n/c         A41 BE1#
               B13 Dat20      A13 Dat19       B42 RESET#      A42 BE2#
               B14 GND        A14 Dat21       B43 DC#         A43 GND
               B15 Dat22      A15 Dat23       B44 M/ID#       A44 BE3#
               B16 Dat24      A16 Dat25       B45 W/R#        A45 ADS#
               B17 Dat26      A17 GND         B46             A46 
               B18 Dat28      A18 Dat27       B47             A47 
               B19 Dat30      A19 Dat29       B48 RDYRTN#     A48 LRDY#
               B20 Vcc        A20 Dat31       B49 GND         A49 LDEV<x>#
               B21 Adr31      A21 Adr30       B50 IRQ9        A50 LREQ<x>#
               B22 GND        A22 Adr28       B51 BRDY#       A51 GND
               B23 Adr29      A23 Adr26       B52 BLAST#      A52 LGNT<x>#
               B24 Adr27      A24 GND         B53 ID0         A53 Vcc
               B25 Adr25      A25 Adr24       B54 ID1         A54 ID2
               B26 Adr23      A26 Adr22       B55 GND         A55 ID3
               B27 Adr21      A27 Vcc         B56 LCLK        A56 ID4
               B28 Adr19      A28 Adr20       B57 Vcc         A57 LKEN# 
               B29 GND        A29 Adr18       B58 LBS16#      A58 LEAD5#

                       PCI LOCAL BUS I/O CONNECTOR

                  PCI Cards Universal/3.3V/5V and 32/64 bit
              pin Signal     pin  Signal     pin   Signal    pin  Signal
              B1  -12V       A1   TRST#      B48  AD[10]     A48  Ground
              B2  TCK        A2  +12V        B49 Ground      A49 AD[09]
              B3  Ground     A3  TMS         B50 (KEYWAY2)   A50 (KEYWAY2)
              B4  TDO        A4  TDI         B51 (KEYWAY2)   A51 (KEYWAY2)
              B5  +5V        A5  +5V         B52 AD[08]      A52 C/BE[0]# 
              B6  +5V        A6  INTA#       B53 AD[07]      A53 +3.3V
              B7  INTB#      A7  INTC#       B54 +3.3V       A54 AD[06]
              B8  INTD#      A8  +5V         B55 AD[05]      A55 AD[04]
              B9  PRSNT1#    A9  reserved    B56 AD[03]      A56 Ground
              B10 reserved   A10 +Vi/o       B57 Ground      A57 AD[02]
              B11 PRSNT2#    A11 reserved    B58 AD[01]      A58 AD[00]
              B12 (KEYWAY1)  A12 (KEYWAY1)   B59 Vi/o        A59 +Vi/o
              B13 (KEYWAY1)  A13 (KEYWAY1)   B60 ACK64#      A60 REQ64#
              B14 reserved   A14 reserved    B61 +5V         A61 +5V
              B15 Ground     A15 RST#        B62 +5V         A62 +5V
              B16 CLK        A16 Vi/o        B63 reserved    A63 Ground
              B17 Ground     A17 VNT#        B64 Ground      A64 C/BE[7]#
              B18 REQ#       A18 Ground      B65 C/BE[6]#    A65 C/BE[5]#
              B19 +Vi/o      A19 reserved    B66 C/BE[4]#    A66 +Vi/o
              B20 AD[31]     A20 AD[30]      B67 Ground      A67 PAR64
              B21 AD[29]     A21 +3.3V       B68 AD[63]      A68 AD[62]
              B22 Ground     A22 AD[28]      B69 AD[61]      A69 Ground
              B23 AD[27]     A23 AD[26]      B70 +Vi/o       A70 AD[60]
              B24 AD[25]     A24 Ground      B71 AD[59]      A71 AD[58]
              B25 +3.3V      A25 AD[24]      B72 AD[57]      A72 Ground
              B26 C/BE[3]#   A26 IDSEL       B73 Ground      A73 AD[56]
              B27 AD[23]     A27 +3.3V       B74 AD[55]      A74 AD[54]
              B28 Ground     A28 AD[22]      B75 AD[53]      A75 +Vi/o
              B29 AD[21]     A29 AD[20]      B76 Ground      A76 AD[52]
              B30 AD[19]     A30 Ground      B77 AD[51]      A77 AD[50]
              B31 +3.3V      A31 AD[18]      B78 AD[49]      A78 Ground
              B32 AD[17]     A32 AD[16]      B79 +Vi/o       A79 AD[48]
              B33 C/BE[2]#   A33 +3.3V       B80 AD[47]      A80 AD[46]
              B34 Ground     A34 FRAME#      B81 AD{45]      A81 Ground
              B35 IRDY#      A35 Ground      B82 Ground      A82 AD[44]
              B36 +3.3V      A36 TRDY#       B83 AD[43]      A83 AD[42]
              B37 DEVSEL#    A37 Ground      B84 AD[41]      A84 +Vi/o
              B38 Ground     A38 STOP#       B85 Ground      A85 AD[40]
              B39 LOCK#      A39 +3.3V       B86 AD[39]      A86 AD[38]
              B40 PERR#      A40 SDONE       B87 AD[37]      A87 Ground
              B41 +3.3V      A41 SBO#        B88 +Vi/o       A88 AD[36]
              B42 SERR#      A42 Ground      B89 AD[35]      A89 AD[34]
              B43 +3.3V      A43 PAR         B90 AD[33]      A90 Ground
              B44 C/BE[1]#   A44 AD[15]      B91 Ground      A91 AD[32]
              B45 AD[14]     A45 +3.3V       B92 reserved    A92 reserved
              B46 Ground     A46 AD[13]      B93 reserved    A93 Ground
              B47 AD[12]     A47 AD11]       B94 Ground      A94 reserved  

      Note!!  Pins 63-94 exist on 64 bit PCI implementation only.
 	      KEYWAY1 exists on Universal and 3.3V boards, they are Ground on 5V boards.
              KEYWAY2 exists on Universal and 5V boards, they are Ground on 3.3V boards.
              +Vi/o is 3.3V on 3.3V boards, 5V on 5V boards, and define signal rails on
              the Universal board. 

                                30 PIN SIMM CONNECTOR

               30 pin Fast Page Mode SIMM  256kx8 256kx9 1Mx8 1Mx9 4Mx8 4Mx9
               
               pin     Signal     pin    Signal   pin    Signal   pin    Signal
                1       Vcc       9       Gnd     17      A8      25      DQ7
                2       -CAS      10      DQ2     18      A9      26      QP
                3       DQ0       11      A4      19      A10     27      -RAS
                4       A0        12      A5      20      DQ5     28      -CASP
                5       A1        13      DQ3     21      -WE     29      DP
                6       DQ1       14      A6      22      Gnd     30      Vcc
                7       A2        15      A7      23      DQ6
                8       A3        16      DQ4     24      N/C

               Note!!  QP, CASP and DP are N/C on all x8 bit modules
               a9 is a N/C on 256k modules
               a10 is a N/C on 256k and 1M modules
 
               Although there are 30 tabs on each side of the SIMM PCB
               there are only 30 signal connectors on the SIMM socket and
               each tab is a redundant connection.

                                72 PIN SIMM CONNECTOR

              72 pin Fast Page Mode SIMM  256k/512k/1M/2M/4M/8M x 32/36 bit

              pin    Signal      pin    Signal   pin    Signal   pin     Signal
               1       Gnd       19      A10     37      MP1     55      DQ11
               2       DQ0       20      DQ4     38      MP3     56      DQ27
               3       DQ16      21      DQ20    39      Gnd     57      DQ12
               4       DQ1       22      DQ5     40      -CAS0   58      DQ28
               5       DQ17      23      DQ21    41      -CAS2   59      Vcc
               6       DQ2       24      DQ6     42      -CAS3   60      DQ29
               7       DQ18      25      DQ22    43      -CAS1   61      DQ13
               8       DQ3       26      DQ7     44      -RAS0   62      DQ30
               9       DQ19      27      DQ23    45      -RAS1   63      DQ14
               10      Vcc       28      A7      46      N/C     64      DQ31
               11      N/C       29      N/C     47      -WE     65      DQ15
               12      A0        30      Vcc     48      N/C     66      N/C
               13      A1        31      A8      49      DQ8     67      PD1
               14      A2        32      A9      50      DQ24    68      PD2
               15      A3        33      -RAS3   51      DQ9     69      PD3
               16      A4        34      -RAS2   52      DQ25    70      PD4
               17      A5        35      MP2     53      DQ10    71      N/C
               18      A6        36      MP0     54      DQ26    72      Gnd

               Note!! MP0,MP1,MP2,MP3 are N/C on all x32 bit modules
               a9 is a N/C on 256k and 512k modules
               a10 is a N/C on 256k, 512k, 1M and 4M modules
               RAS1/RAS3 are N/C on 256k, 1M and 4M modules
               
               Although there are 72 tabs on each side of the SIMM PCB there are
               only 72 signal connectors on the SIMM socket and each tab is a 
               redundant connection.















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