1-8 Technical Information
Table Section 1-5 I/O Address Map
Address (Hex) I/O Device Name
0376 Secondary IDE channel command port
0377 Secondary IDE channel status port
0378-037F Parallel port 1
03BC-03BF Parallel port 2
03C0-03CF Video Graphics Array (VGA) compare registers
03E8-03EF Serial port 3
03F0-03F5 Diskette channel 1
03F6 Primary IDE channel command port
03F7 (write) Diskette channel command port
03F7, bit 7 Diskette change channel 1
03F7, bits 6:0 Primary IDE channel status port
03F8-03FF Asynchronous communications port 1
0CF8 PCI Configuration Space Enable
0CF9 Deturbo Mode Enable
C000-C0FF 82434LX configuration registers
C200-C2FF 82378IB configuration registers
C300-C3FF Cirrus Video configuration registers
System Memory
The system comes standard with 8-MB of memory. System memory can be expanded up to
80 MB for the desktop system and up 136 MB for the minitower system. Memory expan-
sion is performed using single in-line memory modules (SIMMs) installed in SIMM sockets.
The standard 8 MB of memory is soldered on the system board. The first megabyte includes
the standard 640 KB of base memory. The remaining memory is extended memory. Four
SIMM sockets are integrated on the system board.
The SIMM memory sockets accept 1-, 2-, 4-, 8-, 16-, or 32-MB SIMM sticks. High-speed
RAM is 32 bits wide with four parity bits. SIMMs are 256 K x 36 bit (1 MB), 512 K x 36
bit (2 MB), 1 M x 36 bit (4 MB), 4 M x 36 bit (16 MB), and 8 M x 36 bit (32 MB). There
are no switches or jumpers to set when SIMMs are added.
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