PC connector pinouts

TORRAK-software

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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
SCSI device connectors (PC & MAC)
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#
12-DRSEL0#
22-WRDATA#
32-HDSEL1#

4---Microfloppy
14-DRSEL1#
24-WREN#
34-DSKCHG#

6---EDENSEL
16-DTEN0#
26-TRK0#
 

8---INDX#
18-DIR#
28-WRPRDT#
 

10-MTEN1#
20-STP#
30-RDDATA#
 

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
--------------------------------
--------------------------------
33                          1
 

1                            33
ooooooooooooooooo
ooooooooooooooooo
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
1---Reset
6---HD9
11-HD3
16-HD14
21-RESVD
26-GND
31-IRQ14
36-HA2
41-+5V Logic

B---MFG USE
2---GND
7---HD5
12-HD12
17-HD0
22-GND
27-IORDY#
32-IO16#
37-CS0#
42-+5V Motor

C---MFG USE
3---HD7
8---HD10
13-HD2
18-HD15
23-IOW#
28-ALE
33-HA1
38-CS1#
43-Gnd

D--MFG USE
4---HD8
9---HD4
14-HD13
19-GND
24-GND
29-RESVD
34-RESVD#
39-DRAC#
44-TYPE ((0=ATA)


5---HD6
10-HD11
15-HD1
20-KEY
25-IOR#
30-GND
35-HA0
40-GND
 

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

 

RLL/MFM IDC-20 DATA CABLE

 

pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19

Drive Selected
(reserved)
(reserved)
(reserved)
(reserved)
GND
Write Data+
GND
Read Data+
GND

2
4
6
8
10
12
14
16
18
20

GND
GND
GND
GND
(reserved)
GND
Write Data
GND
NRZ Read Data
GND


pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34

Head Sel 8
Head Sel 4
Write Gate
Seek Complete
Track 0
Write Fault
Head Sel 1
(reserved)
Head Sel 2
Index
Ready
Step
Drive Sel 1
Drive Sel 2
Drive Sel 3
Drive Sel 4
Direction In

 

 

 

 

 

 

 

ESDI 34 PIN CONTROL CABLE AND
20 PIN DATA CABLE PINOUTS

 

ESDI IDC-34 CONTROL CABLE

 

ESDI IDC-20 DATA CABLE

pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19
21
23
25
27
29
31
33

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND

2
4
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34

Head Sel 3
Head Sel 2
Write Gate
Config/Stat Data
Transfer Ack
Attn
Head Sel 0
Sect/Add MK Found
Head Sel 1
Index
Ready
Trans Req
Drive Sel 1
Drive Sel 2
Drive Sel 3
Read Gate
Command Data

pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19

Drive Selected
Seek Complete
(reserved)
Write Clk+
Cartridge Change
Read Ref Clk-
NRZ Write Data+
GND
NRZ Read Data+
GND

2
4
6
8
10
12
14
16
18
20

Sect/Add MK Found
Addr Mark Enable
GND
Write Clk-
Read Ref Clk+
GND
NRZ Write Data-
GND
NRZ Read Data-
GND

 

 

 

 

 

 

 

SCSI DEVICE CONNECTOR PINOUTS

 

SCSI CONNECTOR PINOUTS (Single Ended) IDC-50 MALE

   

pin

Signal

pin

Signal

pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19
21
23
25

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
(open)

2
4
6
8
10
12
14
16
18
20
22
24
26

-DB0
-DB1
-DB2
-DB3
-DB4
-DB5
-DB6
-DB7
-DBP
GND
GND
GND
TERMPWR

27
29
31
33
35
37
39
41
43
45
47
49
 

GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
GND
 

28
30
32
34
36
38
40
42
44
46
48
50
 

GND
GND
-ATN
GND
-BSY
-ACK
-RST
-MSG
-SEL
-C/D
-REQ
-I/O
 

 

SCSI CONNECTOR PINOUTS (Differential) IDC-50 MALE

   

pin

Signal

pin

Signal

pin

Signal

pin

Signal

1
3
5
7
9
11
13
15
17
19
21
23
25

(open)
+DB0
+DB1
+DB2
+DB3
+DB4
+DB5
+DB6
+DB7
+DBP
DIFFSENS
GND
TERMPWR

2
4
6
8
10
12
14
16
18
20
22
24
26

GND
-DB0
-DB1
-DB2
-DB3
-DB4
-DB5
-DB6
-DB7
-DBP
GND
GND
TERMPWR

27
29
31
33
35
37
39
41
43
45
47
49
 

GND
+ATN
GND
+BSY
+ACK
+RST
+MSG
+SEL
+C/D
+REQ
+I/O
GND
 

28
30
32
34
36
38
40
42
44
46
48
50
 

GND
-ATN
GND
-BSY
-ACK
-RST
-MSG
-SEL
-C/D
-REQ
-I/O
GND
 

 

Macintosh SCSI Connector Pinouts (Single Ended) DB-25S Female

   

pin

Signal

pin

Signal

pin

Signal

pin

Signal

01
02
03
04
05
06
07
 

-REQ
-MSG
-I/O
-RST
-ACK
-BSY
GND
 

08
09
10
11
12
13

 

-DB0
GND
-DB3
-DB5
-DB6
-DB7

 

14
15
16
17
18
19

 

GND
-C/D
GND
-ATN
GND
-SEL

 

20
21
22
23
24
25

 

-DBP
-DB1
-DB2
-DB4
GND
NV (TERMPWR)

 

 

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

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.

Last updated: 07. January 2000

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