PATH ADC Home > Documentation > Hardware
> Power Mac G4 Developer Note
|
The Power Mac G4 computer has four expansion slots using the industry-standard peripheral component interconnect (PCI) bus.
The computer's case has five openings in the back for access to I/O connectors on cards in the four expansion slots and the AGP slot. The openings and the corresponding slots are listed in Table 4-3.
| 1 | AGP-4x | J16 and J9 (aligned) |
| 2 | PCI | J17 |
| 3 | PCI | J12 |
| 4 | PCI | J11 |
| 5 | PCI | J10 |
The expansion slots accept 33 MHz PCI cards with either 32-bit or 64-bit address and data buses. The PCI cards can use power at +5 V, +3.3 V, or both. The slots accept standard 6.88-inch and 12.283-inch PCI cards as defined by the PCI Local Bus Specification. Revision 2.1. The cards are required to use the standard ISA fence described in the specification.
The expansion slots support all the required PCI signals and certain optional PCI signals. The PCI slots support the optional 64-bit bus extension signals and cache support signals.
The PCI slots and the AGP-4x slot carry the 3.3V_AUX power and PME signals to allow an expansion card to wake the computer from Sleep mode.
The maximum total power available for all four PCI slots and the AGP-4x slot is 62 watts. The AGP-4x slot can account for up to 20 watts of that total.
To install or remove a PCI expansion card, the user first opens the door of the enclosure. Then the user removes the blank PCI fence for the appropriate slot, inserts the card in the slot, and screws the card's fence into place to secure the card. The user then closes the enclosure door and turns on the computer. In order to use the new PCI card, a driver must be installed. The driver installation procedure is documented by the manufacturer of the PCI card.
IMPORTANT
The user should first shut down the computer before removing or installing PCI expansion cards. The Power Mac G4 does not support PCI hot-plugging functionality. The main logic board has a green light to let the user know that power is present.