Communication Slot: Specifications

I'm looking for information on the communications slot used in many Macintosh LC and Performa computers.
This article has been archived and is no longer updated by Apple.
The following computers have the communications slot:

Macintosh 575 family
Macintosh 630 family
Macintosh 5200 family
Macintosh 5300 family
Performa 6200CD series
Performa 6300 series

The Communication slot is a 112 pin slot with a 32-bit wide data path.

Following is the pinout description for the communication slot:

Signal Name           Pin#  Pin#    Signal Name
-------------------   ----  ----    ----------------------
Audio MODEM to Host    1     2      Audio Host to MODEM
Audio MH GND           3     4      MIC to MODEM
R/W*                   5     6      DS*
BERR*                  7     8      DSACK1*
DSACK0*                9    10      GND
IOSIZE0*              11    12      C16M
IOSIZE1*              13    14      GND
RESET*                15    16      Bus Grant-Sacramento
IOD[31]               17    18      IOD[30]
IOD[29]               19    20      IOD[28]
IOD[27]               21    22      IOD[26]
IOD[25]               23    24      IOD[24]

IOD[23]               25    26      IOD[22]
+5V                   27    28      IOD[21]
IOD[20]               29    30      IOD[19]
IOD[18]               31    32      IOD[17]
IOD[16]               33    34      IOD[15]
IOD[14]               35    36      IOD[13]
IOD[12]               37    38      IOD[11]
IOD[10]               39    40      IOD[9]
IOD[8]                41    42      GND
IOD[7]                43    44      IOD[6]
IOD[5]                45    46      IOD[4]
IOD[3]                47    48      IOD[2]
IOD[1]                49    50      IOD[0]
BGACK*                51    52      Bus Request-Sacramento
IO_CS_TIMED*          53    54      IO_CS_DSACK*
+5V                   55    56      Sacramento IRQ*
IOA[1]                57    58      IOA[0]
A[2]                  59    60      A[3]
A[4]                  61    62      A[5]
A[6]                  63    64      A[7]
A[8]                  65    66      A[9]
A[10]                 67    68      A[11]
A[12]                 69    70      GND

A[13]                 71    72      A[14]
A[15]                 73    74      A[16]
A[17]                 75    76      A[18]
A[19]                 77    78      A[20]
A[21]                 79    80      A[22]
A[23]                 81    82      A[24]
+5V                   83    84      A[25]
A[26]                 85    86      A[27]
A[28]                 87    88      A[29]
A[30]                 89    90      A[31]
CPU_AS*               91    92      GND
TRICKLE+5V            93    94      System wakeup
'040 bus clock        95    96      -5V
+12V                  97    98      GND
spare                 99   100      C32M
spare                101   102      GND
spare                103   104      spare
SCC port A enable    105   106      spare
TxDA                 107   108      RxDA
RTSA*                109   110      CTSA*
DTRA*                111   112      DCDA*

* = active low signal

There are four communication slot cards available:

* Macintosh Express Fax/Modem - M2480LL/A (Discontinued)

* Apple Ethernet CS Twisted Pair Card - M3065Z/A (for use with a 10BASE-T compatible hub)
* Apple Ethernet CS Thin Coax Card - M2708Z/A
* Apple Ethernet CS AAUI Card - M3066Z/A

Note:
The following computers are in the corresponding Macintosh families and series:

* Macintosh 575 family: LC 575, 580, Performa 575, 577, 578, 580

* Macintosh 630 family: LC 630, LC 630 DOS Compatible, Quadra 630,  Performa 630, 630CD, 631CD, 635CD, 636, 636CD, 637CD, 638CD, 640CD

* Macintosh 5200 family: Power Macintosh 5200/75 LC, Performa 5200, 5210, 5215, 5220.

* Macintosh 5300 family: Power Macintosh 5300/100 LC, Performa 5300.

* Performa 6200CD series: 6200, 6205, 6214, 6216, 6218, 6220, 6230.

* Performa 6300 series: Performa 6300, 6290.

Note: To distinguish between those cards that are compatible with the Power Macintosh 5400 from those compatible with earlier models, the communication slots themselves are named distinctly. The communications slot in previous models is referred to as "comm slot I" whereas the slot in the Power Macintosh 5400 is called "comm slot II".


The Tech Info Library article "Power Macintosh 5400: New Communications Slot" contains information on the Power Macintosh 5400 communciations slot.
Published Date: Feb 19, 2012