# Apple Macintosh Portable Processor-Direct Slot (PPDS)

96 PIN Euro-DIN CONNECTOR

Pin | Name
--- | ---
a1 | GND
a2 | +5V
a3 | +5V
a4 | +5V
a5 | /DELAY.CS
a6 | /VMA
a7 | /BG
a8 | /LDS
a9 | GND
a10 | A2
a11 | A5
a12 | A8
a13 | A11
a14 | A14
a15 | A17
a16 | reserved
a17 | n/c
a18 | reserved
a19 | reserved
a20 | D1
a21 | D4
a22 | D7
a23 | D10
a24 | D13
a25 | +5/3.7V
a26 | A19
a27 | A22
a28 | FC0
a29 | /IPL0
a30 | /BERR
a31 | GND
a32 | GND
b1 | GND
b2 | +5V
b3 | +5V
b4 | +5V
b5 | /SYS.PWR
b6 | /BR
b7 | /DTACK
b8 | /UDS
b9 | +5/0V
b10 | A3
b11 | A6
b12 | A9
b13 | A12
b14 | A15
b15 | A18
b16 | reserved
b17 | reserved
b18 | reserved
b19 | +12V
b20 | D2
b21 | D5
b22 | D8
b23 | D11
b24 | D14
b25 | +5V
b26 | A20
b27 | A23
b28 | FC1
b29 | /IPL1
b30 | /EXT.DTACK
b31 | 16M
b32 | GND
c1 | GND
c2 | +5V
c3 | +5V
c4 | +5V
c5 | /VPA
c6 | /BGACK
c7 | R/W
c8 | /AS
c9 | A1
c10 | A4
c11 | A7
c12 | A10
c13 | A13
c14 | A16
c15 | reserved
c16 | n/c
c17 | reserved
c18 | reserved
c19 | D0
c20 | D3
c21 | D6
c22 | D9
c23 | D12
c24 | D15
c25 | GND
c26 | A21
c27 | E
c28 | FC2
c29 | /IPL2
c30 | /SYS.RST
c31 | GND
c32 | GND

## D0-D15

Unbuffered data bus, bits 0 through 15

## A1-A23

Unbuffered address bus, bits 1 through 23

## 16M

16 MHz clock

## /EXT.DTACK

External data transfer acknowledge. This signal is an input to the processor logic glue. Assertion delays external generation of the /DTACK signal.

## E

E(enable) clock

## /BERR

Bus error signal generated whenever /AS remains low for more than about 250 us.

## /IPL0-/IPL2

Input priority level lines 0 through 2.

## /SYS.RST

Initiates a system reset.

## /SYS.PWR

A signal from the Power Manager indicated that associated circuits should tri-state their outputs and go inte idle state; /SYS.PWR is pulled high (deasserted) during sleep state.

## /AS

Address strobe

## /UDS

Upper data strobe

## /LDS

Lower data strobe

## R/W

Defines bus transfer as read or write signal

## /DTACK

Data transfer acknowledge

## /DELAY.CS

Indicates that a wait state is inserted into the current memory cycle and that you can delay a CS.

## /BG

Bus grant

## /BGACK

Bus grant acknowledge

## /BR

Bus request

## /VMA

Valid memory access

## /VPA

Valid peripheral address

## FC0-FC2

Function code lines 0 through 2

## +5/0V

Provides +5V when the system is running normally and 0V when the system is in sleep mode.

## +5/3.7V

Provides +5V when the system is running normally and 3.7V when the system is in sleep mode.

Contributor: Joakim Ögren

Source:
Technote HW12: Macintosh Portable PDS Development at Apple Technical Notes

Copyright © The Hardware Book Team 1996-2001.
May be copied and redistributed, partially or in whole, as appropriate.
Document last modified: 2000-07-07