QL 4001
Appendix B - Memory and I/O Map

Table of Contents

Memory Map
On Board I/O Map

Memory Map

00000 - 9FFFF           System DRAM Memory
A0000 - BFFFF           VGA Video Memory
C0000 - C7FFF           VGA Video BIOS Copied to Shadow RAM
C8000 - CBFFF           Reserved for Diskless Download Code
CC000 - CFFFF           16K Dual-Ported-RAM
D0000 - EFFFF           Not used, can be used for EMS
F0000 - FFFFF           AMI System BIOS Copied to Shadow RAM
100000 - FFFFFF         Extended DRAM, up to 16 MB

On Board I/O Map

000 - 00F                       DMA 1
020 - 021                       PIC 1
040 - 043                       Timer
060,064                         8742 Keyboard Controller
061                             Port B
070 - 071                       CMOS RAM & NMI Mask
Register
080                             Manufacturing HEX Display
081 - 08F                       DMA Page Registers
0A0 - 0A1                       PIC 2
0C0 - 0DF                       DMA 2
1F0 - 1FF                       IDE Hard Disk Drive
2F8 - 2FF                       COM 2
300 - 302                       QL 4001 Command/Status
378 - 37F                       LPT 1
3B0 - 3DF                       VGA
3F8 - 3FF                       COM 1
46E8,102                        VGA Configuration Ports

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