Memory Map - Compaq Deskpro EN Series Maintenance & Service Manual

I/O Address (Hex)
2E8 - 2EF
2F8 - 2FF
31A - 36F
38C - 397
39A - 3AF
3B0 - 3BB
3BC - 3BF
3C0 - 3DF
3E0 - 3E7
3E8 - 3EF
3F8 - 3FF
7.1.5

Memory Map

Size*
256 KB
3839 MB
255 MB
128KB
96 KB
32 KB
128 KB
640 KB
*All memory above the first 256 MB is non-cacheable.
All PCI memory is non-cacheable.
7-4 Specifications
System Function (Shipping Configuration)
220 - 22F Unused
230 - 277 Unused
278 - 27F Reserved Parallel Port
280 - 2E7 Unused
Reserved Serial Port
2F0 - 2F7 Unused
Reserved Serial Port
300 - 317 Unused
318 - 319 Unused
Unused
370 - 377 Reserved
378 - 37F Parallel Port (Primary)
380 - 387 Unused
388 - 38B FM Synthesizer (OPL III)
Unused
398 - 399 Super AI/O Index/Data (Default; Alt = 26Eh, 15Ch, 02Eh)
Unused
MDA, EGA/VGA
Reserved (Parallel Port)
EGA/VGA
Unused
Reserved (Serial Port)
3F0 - 3F7 Diskette Controller
Serial Port (Primary)
Memory Address
FFFFFFFFh to FFFC0000h
FFFBFFFFh to 10000000h
0FFFFFFFh to 00100000h
000FFFFFh to 000E0000h
000DFFFFh to 000C8000h
000C7FFFh to 000C0000h
000BFFFFh to 000A0000h
0009FFFFh to 00000000h
System Function
System ROM
PCI Memory Expansion
HOST or PCI Memory Expansion
System ROM
ISA/PCI option ROMs
Video ROM
Video RAM
Base Memory