Dell Dimension 2100 System Reference Manual page 42

CAS latency
SPD revision
Buffering
Voltage
Data bus width
BIOS address
1
Video memory uses 1 or 2 MB of system memory (RAM). Total RAM reported is 1 or 2 MB
less than RAM installed.
2
Up to 11 MB of system memory may be allocated to support DVMT Graphics.
Drives
Externally accessible
Internally accessible
Ports
Externally accessible
Serial (DTE)
Parallel
Video
three
1.2
unbuffered
3.3 V
64 bits
F0000h
one 5.25-inch bay and two 3.5-inch bays
one bay for 1-inch-high IDE hard drive
9-pin connector; 16550C-compatible
25-hole connector (bidirectional)
15-hole connector