Technical Information 1-9
Table Section 1-3 I/O Address Map
Address (Hex)
I/O Device Name
0CF9
Turbo and reset control register
0CFC-0CFF*
PCI configuration data register
FF00-FF07
IDE bus master register
FFA0-FFA7
IDE primary channel
0FF0-0FF7
CS4236 audio
* Only accessible by DWORD accesses.
System Memory
Configurations ship with 16 MB of memory (32 MB in the SCSI configuration): 640 KB of
base memory and 15 MB (31 MB in the SCSI configuration) of extended memory. System
memory can be expanded up to 256 MB, using optional single in-line memory modules
(SIMMs) installed in SIMM sockets on the system board.
The memory configuration consists of two banks (bank 0 and bank 1) with two sockets
each. The SIMM memory sockets accept 32-bit (non-parity) 4-, 8-, 16-, 32-, or 64-MB, 60
ns, Extended Data Out (EDO) mode SIMMs.
NOTE:
64-MB SIMMs have not been qualified
for use, but they will be supported by the system
board when they become available.
The SIMMs are 1 MB x 32 bit (4 MB), 2 MB x 32 bit (8 MB), 4 MB x 32 bit (16 MB), 8
MB x 32 bit (32 MB), and 16 MB x 32 bit (64 MB). When the standard SIMMs are
removed, four 64-MB SIMMs may be installed for a total of 256 MB.
CAUTION:
SIMMs must match the tin metal
plating used on the system board SIMM sockets.
When adding SIMMs, use tin-plated SIMMs.
SIMMs install directly in the four sockets on the system board. The four sockets are
assigned as Bank 0 (2 sockets) and Bank 1 (2 sockets). All configurations have two SIMMs
are installed in bank 1. SIMM banks can be populated in either order.
SIMMs must be installed in pairs of the same memory type and size. Both sockets must be
populated within a bank for the system to work. No switch or jumpers are required to set
when the memory is changed. The system BIOS automatically detects the SIMMs. See
“Checking the Memory in the System” in Section 3 for the valid configurations.
