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Peripherals
Super I/O Chip
The 87309 device supports two serial ports, one parallel port, diskette drive, and PS/2-compatible
keyboard and mouse. The system provides the connector interface for each port.
Serial Ports
Both serial ports are relocatable. By default, port A is physically the top connector, port B on the
bottom. Each serial port can be set to one of four different COMx ports, and each can be enabled
separately. When enabled, each port can be programmed to generate edge- or level-sensitive
interrupts. When disabled, serial port interrupts are available to add-in boards.
Parallel Port
The 25/15-pin connector stacks the parallel port over the VGA. The 87309 provides one
IEEE 1284-compatible 25-pin bidirectional EPP (supporting levels 1.7 and 1.9). BIOS
programming of the 87309 registers enables the parallel port and determines the port address and
interrupt. When disabled, the interrupt is available to add-in boards.
Add-in Board Slots
The baseboard has one ISA slot that is full-length if the wide SCSI-B slot is not used (and half-
length if the wide SCSI-B slot is used); the ISA slot supports slave-only boards and is shared with
PCI-B slot 4. The ISA has three embedded devices: the Super I/O chip, Baseboard Management
Controller (BMC), and flash memory for system BIOS. ISA features:
Bus speed up to 8.33 MHz
16-bit memory addressing
Type A transfers at 5.33 MB/sec
Type B transfers at 8 MB/sec
8- or 16-bit data transfers
Plug and Play ready
The baseboard has two 32-bit PCI bus segments: PCI-A and PCI-B. These provide seven slots for
PCI add-in boards: three on PCI-A and four on PCI-B. PCI-B4 is shared with the ISA slot.
PCI-A1 supports half-length boards only. The other slots support full-length boards. PCI features:
33 MHz bus speed
32-bit memory addressing
5 V signaling environment
Burst transfers of up to 133 MB/sec
8-, 16-, or 32-bit data transfers
Plug and Play ready
Parity enabled
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