E x p a n s i o n c a r d s
4/4 LS/VS660 OWNER’S HANDBOOK
I/O ports
Default assignment
080h-09Fh
DMA page register
0A0h-0A1h
Interrupt controller 2
0B4h, 0B8h, 0BCh
Local bus ATA/IDE
0C0h-0DFh
DMA controller 2
0F0h, 0F1h
Math coprocessor busy (clear/reset)
0F8h-0FFh
Math coprocessor
1F0h-1F7h
Hard disk drive controller
200h-207h
Game I/O (disable)
220h-22Fh, 230h-233Fh
Sound blaster system
240h-24Fh, 250h-253Fh
Alternate Sound blaster system
278h-27Fh
Parallel port 2
2B0h-2DFh
Alternate VGA
2F8h-2FFh
Serial port 2
300h-301Fh
Alternate MIDI (disable)
330h-331Fh
MIDI
378h-37Fh
Parallel port 1
388h-38Fh
FM synthesiser
3B0h-3BFh
Monochrome display and printer adapter
3B4h, 3B5h, 3BAh
Video subsystem
3C0h-3C5h
VGA
3C6h-3C9h
Video DAC
3CAh-3DFh
VGA
3F0h-3F7h
Diskette drive controller
3F8h-3FFh
Serial port 1
Base memory address
Some expansion cards are fitted with memory of their own, usually
read-only memory (ROM) containing functional extensions to the
computer’s BIOS (basic input/output system) ROM. Some cards
also have random-access memory (RAM).
In order that this memory can be recognised by the system
processor, it must be mapped somewhere within the computer’s
own address space. By setting the base memory address you specify