
34
Planar Clean Screen PC User’s Manual
Appendix B: Programming Interface
Memory Map
Range
CPU address
Region
Cached
0 to 640K
00000000-0009FFFF
DRAM
yes
640K to 768K
000A0000-000BFFFF
VGA memory
no
768K to 816K
000C0000-000CBFFF
Shadowed VGA BIOS
yes
816K to 896K
000CC000-000DFFFF
Unused — Available for ISA bus BIOS Setup
896K to 1M
000E0000-000FFFFF
Shadowed System ROM BIOS
yes
1M to 8M
00100000-007FFFFF
DRAM
yes
If no DRAM, ISA memory
no
8M to 16M
00800000-00FFFFFF
DRAM
yes
If no DRAM, ISA memory
no
16M to 32M
01000000-01FFFFFF
DRAM
yes
If no DRAM, ISA memory
no
32M to 64M
02000000-03FFFFFF
DRAM
yes
If no DRAM, ISA memory
no
64M to (4.0G–512K) 04000000-FFF7FFFF
PCI bus/ISA bus alias
no
Top 512K–16K
FFF80000-FFFFBFFF
System ROM BIOS
no
Top 16K
FFFFC000-FFFFFFFF
Boot Block ROM BIOS
no
Assigned and Available IRQs
Com2
Com1
Real
IDE
Keyboard
Cascade
or
or
Touch
Sound
Floppy
Time
Numeric
Hard
Timer Controller
Interrupt
Com4
Com3
LPT
Screen
Blaster
Disk
Clock
Coprocessor
Disk
PCMCIA
Available
IRQ0
D
IRQ1
D
IRQ2
D
IRQ3
D
X
X
X
IRQ4
X
D
X
X
IRQ5
X
X
D
X
X
X
IRQ6
D
IRQ7
X
X
X
X
X
X
X
IRQ8
D
IRQ9
X
X
X
X
D
X
IRQ10
D
X
IRQ11
X
X
X
X
X
X
X
IRQ12
N O T A V A I L A B L E
IRQ13
D
IRQ14
D
X
IRQ15
X
X
X
D
indicates factory default, X indicates optional or available IRQs
CS Manual LAYOUT#1787 3/9/98 5:33 PM Page 34