Dual Serial/Parallel  (250-4025)    Use With Xenix       Faxback Doc. # 5578
Port Adapter

INSTRUCTIONS FOR USING 25-4025, Tandy dual serial/parallel card as Xenix ports
tty2a and tty3a.

1. Place disk in drive A
2. Type: install
3. Follow instructions

LIMITATIONS:

This driver takes interrupt 5, so the second parallel port can not be
installed on interrupt 5.

If additional multiport cards (i.e., ARNET) are to be installed they must be
on COM4 or greater.

If VP/ix is installed, tty3a will not function.

NOTE: There is no removal script, re-installation of the kernel and link kit
      is required to remove this installation.

The Serial/parallel card (250-4025) must be jumpered as follows:

port #1: COM2 - 2F8, IRQ 3
port #2: COM3 - 3E8, IRQ 5

              ADDRESS JUMPERS                   INTERRUPT JUMPERS
              J10 J9 J8 J7 J6 J5                J4 J3 J2 J1

UPPER                |     |                    |
                     |     |                    |
CENTER         |  |  |  |  |  |                 |  |   \
               |  |     |     |                    |     \
LOWER          |  |     |     |                    |       \

All jumpers are 3 pin vertical jumpers. The address is selected by placing
jumpers on J5-J10, and the interrupt is selected by placing jumpers on J1-J4.
The jumpers can be set to either the upper or lower pair of pins.

J10 - lower pair \
                  > Disable printer port
J9  - lower pair /

J8  - upper pair \
                  > Port #2 address 3E8
J7  - lower pair /

J6  - upper pair \
                  > Port #1 address 2F8
J5  - lower pair /

J4  - upper pair -  Printer direction

J3  - lower pair - Port #1 interrupt IRQ 3

J2  - Center pin of J2 to lower pin of J1 - Port #2 interrupt IRQ 5
      Place this jumper at a diagonal to set COM3 to interrupt IRQ 5.

NOTE: The instructions are for the 250-4025 card only.

(smm 08/03/93)