levels of the serial ports. The standard T5200 supports two serial
ports and one expansion serial
port.Since the I/O address of a
serial port is automatically established according to its interrupt
level, the SETUP program prompts you to specify only the interrupt
level. The I/O address of a serial port which is given an interrupt
level of 5, however, must be set to one of the two predetermined
I/O addresses as shown below.
The relationship between the serial port interrupt levels and I/O
addresses is shown below.
Interrupt Level I/O Address
3 2F8H
4 3F8H
5 3E8H or 2E8H
<fig id=MMS\5200\52003_52.TIF>Page 3-52</fig>
The first setup item in the serial port setup menu sets the I/O address
for the serial port that is to be given an interrupt level of 5.The
SETUP program displays one of the following addresses as the possible
I/O address:
3E8H 2E8H
You can select the appropriate one with the left and right arrow keys.
The second through fourth items in the serial port setup menu set the
interrupt level of the serial ports.
When the cursor is positioned on the second serial port setup menu
item, the SETUP program displays the menu shown below. From this menu,
you can select the interrupt levels to be assigned to the serial ports.
The menu indicates the specified interrupt levels in reverse video. You
can select the appropriate ones with the left and right arrow keys.
After selecting the interrupt levels, press the up or down arrow key,
or the RETURN key. The menu will disappear and the original setup menu
will reappear.
[Serial port setup menus]
Serial A IRQ level = 4 3 4 3 4 3 4 3 4 3
Serial B IRQ level = 3 4 5
5 5 5 - - - -
Toshiba modem IRQ level = - - - - 3 4 3 4 - -
IRQ4 serial port base address = 3F8H
IRQ3 serial port base address = 2F8H
IRQ5 serial port base address = 3E8H
Example 1: when not using an expansion card.
The following serial port interrupt level settings are recommended:
Serial A IRQ level = 4
Serial B IRQ level = 3
Toshiba modem IRQ level = -
Example 2: When using a Toshiba modem card
<fig id=MMS\5200\52003_53.TIF>Page 3-53</fig>
