Mitsubishi Electric apricot ls/vs550 Owner's Handbook Manual page 27

E x p a n s i o n
Base input/output (I/O) port address
Base memory address
3/4 LS/VS550 OWNER'S HANDBOOK
Some expansion cards are also controlled by I/O ports or 'address
space'. The base I/O port address specifies where the card's ports
begin. The following table lists the I/O ports used by devices on the
motherboard.
I/O ports
1F0h-1F7h
278h-27Fh
2B0h-2DFh
2F8h-2FFh
378h-37Fh
3B0h-3BFh
3B4h, 3B5h, 3BAh
3C0h-3C5h
3C6h-3C9h
3CAh-3DFh
3F0h-3F7h
3F8h-3FFh
Any ports not listed are available for expansion cards. All addresses
below 100h are used by the system board for various fixed system
components and chipset controller settings. They are unavailable for use.
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
where the card's memory begins within the address space. Typically,
an expansion card's memory must be mapped onto the addresses
between C8000h and DFFFF in upper memory. With most
modern expansion cards this is fully automatic.
Default assignment
Hard disk drive controller
Parallel port 2 (optional)
Alternate VGA
Serial port 2
Parallel port 1
Monochrome display and printer adapter
Video subsystem
VGA
Video DAC
VGA
Diskette drive controller
Serial port 1