Apple Macintosh Processor-Direct Slot (PDS)
From HwB
Available on Apple Macintosh SE/30 & IIfx.
Cards in the PDS are accessed at 20MHz. This speed should let developers create PDS cards without using expensive components while still providing access to the processor bus. There are two locations in the memory map for PDS cards. Developers should see the "Cards and Drivers Manual" for information on creating PDS cards. This manual is available from APDA.
The cache connector in the Macintosh IIci may look like the Macintosh IIfx PDS connector, but the pinouts are vastly different.
Pinout
120 PIN Euro-DIN CONNECTOR
| Pin | Name | Description |
|---|---|---|
| A1 | res | Reserved |
| A2 | res | Reserved |
| A3 | /BUSLOCK | Bus Clock |
| A4 | /IRQ3 | Interrupt Request 3 |
| A5 | /IPL2* | 68030 IPL2 |
| A6 | /CIOUT* | 68030 Cache inhibit out |
| A7 | /STERM* | Sync.cycle termination |
| A8 | /DSACK1* | 68030 Data ack 1 |
| A9 | SIZ1 | transfer size bit 1 |
| A10 | /BGACK* | 68030 bus grant ack |
| A11 | FC2 | 68030 function code 2 |
| A12 | /RESET* | System reset |
| A13 | D0 | Data bit 0 |
| A14 | D2 | Data bit 2 |
| A15 | D5 | Data bit 5 |
| A16 | D8 | Data bit 8 |
| A17 | D10 | Data bit 10 |
| A18 | D13 | Data bit 13 |
| A19 | D16 | Data bit 16 |
| A20 | D18 | Data bit 18 |
| A21 | D21 | Data bit 21 |
| A22 | D24 | Data bit 24 |
| A23 | D26 | Data bit 26 |
| A24 | D29 | Data bit 29 |
| A25 | A31 | address bit 31 |
| A26 | A29 | address bit 29 |
| A27 | A26 | address bit 26 |
| A28 | A23 | address bit 23 |
| A29 | A21 | address bit 21 |
| A30 | A18 | address bit 18 |
| A31 | A15 | address bit 15 |
| A32 | A13 | address bit 13 |
| A33 | A10 | address bit 10 |
| A34 | A7 | address bit 7 |
| A35 | A5 | address bit 5 |
| A36 | A2 | address bit 2 |
| A37 | +5V | +5 VDC |
| A38 | CPUCLOCK | CPU Clock |
| A39 | GND | Ground |
| A40 | -12V | -12 VDC |
| B1 | res | Reserved |
| B2 | GND | Ground |
| B3 | /TM1A | ? |
| B4 | /IRQ2 | Interrupt Request 2 |
| B5 | /IPL1* | 68030 IPL1 |
| B6 | /DS* | 68030 Data Strobe |
| B7 | /CBACK* | cache burst ack |
| B8 | /DSACK0* | 68030 Data ack 0 |
| B9 | SIZ0 | Transfer Size bit 0 |
| B10 | /BG* | 68030 bus grant |
| B11 | FC1 | 68030 function code 1 |
| B12 | /BERR* | Bus error |
| B13 | +5V | +5 VDC |
| B14 | D3 | Data bit 3 |
| B15 | D6 | Data bit 6 |
| B16 | GND | Ground |
| B17 | D11 | Data bit 11 |
| B18 | D14 | Data bit 14 |
| B19 | +5V | +5 VDC |
| B20 | D19 | Data bit 19 |
| B21 | D22 | Data bit 22 |
| B22 | GND | Ground |
| B23 | D27 | Data bit 27 |
| B24 | D30 | Data bit 30 |
| B25 | +5V | +5 VDC |
| B26 | A28 | address bit 28 |
| B27 | A25 | address bit 25 |
| B28 | GND | Ground |
| B29 | A20 | address bit 20 |
| B30 | A17 | address bit 17 |
| B31 | +5V | +5 VDC |
| B32 | A12 | address bit 12 |
| B33 | A9 | address bit 9 |
| B34 | GND | Ground |
| B35 | A4 | address bit 4 |
| B36 | A1 | address bit 1 |
| B37 | +5V | +5 VDC |
| B38 | ECLK | ? |
| B39 | GND | Ground |
| B40 | -5V | -5 VDC |
| C1 | PWROFF | Power Off? |
| C2 | /NUBUS | ? |
| C3 | /TM0A | ? |
| C4 | /IRQ1 | Interrupt Request 1 |
| C5 | /IPL0* | 68030 IPL0 |
| C6 | /RMC* | 68030 read modify cycle |
| C7 | /CBREQ* | 68030 cache burst req |
| C8 | R/W* | 68030 read write |
| C9 | /AS* | 68030 address strobe |
| C10 | /BR* | 68030 bus request |
| C11 | FC0 | 68030 function code 0 |
| C12 | /HALT* | 68030 Halt |
| C13 | D1 | Data bit 1 |
| C14 | D4 | Data bit 4 |
| C15 | D7 | Data bit 7 |
| C16 | D9 | Data bit 9 |
| C17 | D12 | Data bit 12 |
| C18 | D15 | Data bit 15 |
| C19 | D17 | Data bit 17 |
| C20 | D20 | Data bit 20 |
| C21 | D23 | Data bit 23 |
| C22 | D25 | Data bit 25 |
| C23 | D28 | Data bit 28 |
| C24 | D31 | Data bit 31 |
| C25 | A30 | address bit 30 |
| C26 | A27 | address bit 27 |
| C27 | A24 | address bit 24 |
| C28 | A22 | address bit 22 |
| C29 | A19 | address bit 19 |
| C30 | A16 | address bit 16 |
| C31 | A14 | address bit 14 |
| C32 | A11 | address bit 11 |
| C33 | A8 | address bit 8 |
| C34 | A6 | address bit 6 |
| C35 | A3 | address bit 3 |
| C36 | A0 | address bit 0 |
| C37 | +5V | +5 VDC |
| C38 | C16M | 16 MHz Clock |
| C39 | GND | Ground |
| C40 | +12V | +12 VDC |
Below a table with differences found in the Apple Macintosh IIfx computers:
| Pin | Name | Description |
|---|---|---|
| A1 | GND* | Ground |
| A2 | /PDS.MASTER | ? |
| A3 | res | Reserved |
| A4 | n.c. | Not connected |
| A38 | Reserved | by Apple |
| B1 | ECS | Early cycle start |
| B2 | n.c. | Not connected |
| B3 | /PDS.BG | ? |
| B4 | /IRQ15 | ? |
| B38 | n.c. | Not connected |
| B39 | /SLOT.E | 68030 slot E replace in address map |
| C1 | /PFW | Shutdown bit |
| C2 | n.c. | Not connected |
| C3 | /PDS.BR | Bus request |
| C4 | /IRQ6 | ? |
| C38 | CPUCLK* | 20 MHz clock |