Table of Contents
Advertisement
This chapter describes the software interface of the PCM-4330 PC/104 board
computer.
A 1 MB address space is available in Real Mode and up to 4 MB physical memory
on-board in Protected Virtual Mode.
After a system reset the CPU resumes operation in Real Address Mode. Code
at address FFFFF0h is executed next. Therefore, the BIOS area must be paged into
the upper 64 kB segment of the 4 MB address space. From there a far jump into
segment F000h is performed.
00000000h - 0009FFFFh
000A0000h - 000BFFFFh
000C0000h - 000CBFFFh
000CC000h - 000EFFFFh
000F0000h - 000FFFFFh
00100000h - 003FFFFFh
00000000h - 00FFFFFFh
FFFF0000h - FFFFFFFFh
640 kB User RAM
128 kB Video RAM
40 kB VGA BIOS
144 kB Extemsion ROM
64 kB BIOS on-board
On-board RAM
4 MB
Off-board RAM
16 MB
64 kB BIOS on-board
DOS application
programs
Display refresh memory
40 kB Flash-Filings 8kB
Extended BIOS area
BIOS area
Extended Memory in
Protected Mode only
On expansion boards (if
enabled in setup menu)
BIOS area after reset
Advertisement
Table of Contents
