USB Enhanced and Integrated Ethernet Service Manual

System Overview 1-17
System Clocks
System clock. . . . . . . . . . . . . . 60 or 66 MHz (matches external processor
speed)
Diskette/communications
ports . . . . . . . . . . . . . . . . . . . . 24 MHz from the system clock
Memory
Architecture . . . . . . . . . . . . . . 64-bit, noninterleaved
DIMM sockets . . . . . . . . . . . . four
DIMM capacities . . . . . . . . . . 16, 32, 64, and 128 MB, EDO ECC mode
Standard RAM . . . . . . . . . . . . 16 MB
Maximum RAM . . . . . . . . . . . 512 MB
BIOS address . . . . . . . . . . . . . F000:0000h–F0000:FFFFh
Drives
Externally accessible bays . . . one 3.5-inch bay, dedicated to a 3.5-inch dis-
kette drive; two 5.25-inch bays for half-height
diskette drives, tape drives, or CD-ROM
drives
Internally accessible bays . . . . two hard-disk drive bays; one 1.6-inch-high
and one 1-inch-high EIDE or SCSI hard-disk
drive
Ports
Externally accessible:
Serial (DTE) . . . . . . . . . . . two 9-pin connectors; 16550-compatible
Parallel . . . . . . . . . . . . . . . one 25-hole connector (bidirectional)
Video. . . . . . . . . . . . . . . . . one 15-hole connector (on add-in video card)
PS/2-style keyboard . . . . . 6-pin mini-DIN
PS/2-compatible
mouse . . . . . . . . . . . . . . . . 6-pin mini-DIN
NIC . . . . . . . . . . . . . . . . . . RJ45 connector
USB. . . . . . . . . . . . . . . . . two USB-compliant connectors
Audio line in . . . . . . . . . . . miniature audio jack
Audio speaker out . . . . . . . miniature audio jack
Audio mike in . . . . . . . . . . miniature audio jack
Table 1-5. Technical Specifications
(continued)