Dell Precision 420 - Manual (Page 126)

Mini tower chassis five PCI expansion-card connectors
PCI expansion-card connector size 120 pins
PCI expansion-card connector data width
(maximum) 32 bits
Memory
Architecture Rambus dynamic random- access memory (RDRAM) technology
Rambus in-line memory module (RIMM) slots four (dual channels)
RIMM module capacities 64-, 128-, 256-, and 512-megabyte (MB) 800-MHz Rambus DRAM with error checking and
correction (ECC)
Minimum and maximum total RDRAM
capacities 128 MB to 2 gigabytes (GB)
BIOS address F000:0000h-F000:FFFFh
Drives
Externally accessible bays:
Desktop chassis
3.5-inch bay for a 3.5-inch diskette drive; two 5.25-inch bays for removable media devices
Mini tower chassis
3.5-inch bay for a 3.5-inch diskette drive; three 5.25-inch bays for removable media devices
Internally accessible bays:
Desktop chassis
two 1.6-inch bays for 1.6-inch-high hard-disk drives
Mini tower chassis three 1.6-inch bays for 1.6-inch-high hard-disk drives; four 1-inch bays for 1-inch-high hard-disk
drives
Ports and Connectors
Externally accessible:
Serial (data terminal equipment
[DTE]) two 9-pin connectors; 16550-compatible
Parallel 25-hole connector (bidirectional)
Video 15-hole connector (on video card)
Audio Three 1/8-inch phone jacks for microphone, audio in, and audio out
Integrated NIC RJ45 connector
Personal System/2 (PS/2)-style
keyboard 6-pin mini-Deutche Industrie Norm (DIN)
PS/2-compatible mouse 6-pin mini-DIN
Universal Serial Bus (USB) two USB-compliant connectors
Secondary Ultra/Wide SCSI 68-pin connector
Internally accessible:
Primary Ultra 160/m LVD SCSI 68-pin connector
Secondary Narrow SCSI 50-pin connector