Toshiba A3X manual COM level, LPT setting Interrupt level Address

3 Tests and Diagnostics 3.31 SETUP

10.I/O ports

This option controls settings for the serial and parallel ports.

(a)Serial

Use this option to set the COM level for the serial port. The serial port interrupt request level (IRQ) and I/O port base address for each COM level is shown below:

COM level	Interrupt level	I/O address
COM1	4	3F8H	(Default)
COM2	3	2F8H
COM3	4	3E8H
COM3	5	3E8H
COM3	7	3E8H
COM4	3	2E8H
COM4	5	2E8H
COM4	7	2E8H
Not Used		Disables port

(b)Parallel

This option sets the interrupt request level and I/O port base address for the parallel port. When the parallel port mode is set to Std. Bi-direct, the options are as follows:

LPT setting	Interrupt level	I/O address
LPT 1	7	378H
LPT 2	5	278H
LPT 3	7	3BCH
Not Used		Disables port

When the parallel port mode (see settings below) is set to ECP, the DMA channel can also be set to 1 or 3. The default is 3.

LPT setting	Interrupt level	I/O address	DMA channel
LPT 1	7	378H	3	(Default)
LPT 2	5	278H	3
LPT 3	7	3BCH	3
Not Used		Disables port

Satellite A50S/TECRA A3X Maintenance Manual (960-534) [CONFIDENTIAL] 3-103