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Appendix D
Specifications
Main System Board
System memory
BIOS
Shadow RAM
4MB RAM standard on SIMMs; expandable
using lMB, 2MB, 4MB, or 8MB SIMMs up
to 64MB (maximum); SIMMs must be
70ns, 36-bit, 72-pin, gold-leaded, fast-page
mode type
Two-part system BIOS; one 64KB
permanent BIOS on an EPROM; one 64KB
CPU-dependent BIOS in a FLASH ROM
device
Automatically copies the system BIOS
from ROM into RAM; shadow RAM for
video BIOS and external BIOS is software
selectable
EISA configuration 8KB SRAM; battery-backup
Clock/calendar
Real-time clock, calendar, and CMOS RAM
for configuration; battery backup
Interfaces
Serial
Two RS-232-C, ISA compatible,
asynchronous; 9-pin D-shell connectors
Parallel
ISA compatible, 25-pin, D-shell
connector
Specifications D-l