On Sat, 8 May 1999, Tadayoshi Kubo wrote:
> I know the I/O port No.00-0F is DMA controller and the port No.20-21 is
> interrupt controller. But I don't know how to use the port No22 and 23.
> Anyone know the I/O port No.22,23 meaning on the HP200LX?
Assuming it's simply an 8259, you can find the relevant information in the
package called HelpPC (in the hardware section), available from:
ftp://ftp.cdrom.com/pub/simtelnet/msdos/info/helppc21.zip
This package also has info on a lot of other chips, such as various UARTs
and keyboard controllers and so on.
Under Linux, the PIC is shown as using ports 0x20-0x3f, so it's definitly
part of the PIC.
Davey
