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ROM
video RAM
Memory
relocation
Cache
Math
coprocessor
Clock/
calendar
Memory
4MB or 8MB RAM standard on a SIMM;
expandable to 64MB using 1MB, 2MB,
4MB, 8MB, 16MB, and 32MB SIMMs;
SIMMs must be tin-plated, 72-pin, 32-bit
or 36-bit, fast-page mode type with access
speed of 80ns or faster
128KB Phoenix
®
system BIOS, video BIOS,
and SETUP code located in EPROM on
main system board
512KB or 1MB DRAM on main system
board; expandable to 1MB using four,
20-pin, 70ns, 256KB DIP chips
Shadow RAM
Supports shadowing of system and video
BIOS ROM into RAM
Supports relocation of 256KB of memory
from A0000h to BFFFFh and D0000h to
EFFFFh to extended memory
8KB of internal cache; supports 64KB,
128KB, or 256KB of external cache using
28-pin, 8K x 8 or 32K x 8,20ns DIP chips
Math coprocessor built into the
microprocessor for DX, DX2, and systems
upgraded to a Pentium OverDrive
processor
Real-time clock contained in the 82C491
system controller chip along with 64 bytes
of CMOS RAM backed up by an
integrated battery
A-2
Specifications