User`s guide

Add-in Board Slots
21
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 processor board (also called a baseboard) has one ISA slot that is full-length if the
wide SCSI-B slotis notused (and half-lengthif the wideSCSI-B slot isused); theISA slot
supportsslave-only boardsandis sharedwith PCI-B slot4. The ISAhas threeembedded
devices: the Super I/O device, Baseboard Management Controller (BMC), and flash
memory for system BIOS. ISA features include:
• 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 processor board 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