WESTERN DIGITAL
COMPUTER SYSTEM MAPS FOR HELP IN CONFIGURING
TokenCard FAMILY LAN ADAPTERS
The Western Digital TokenCard family LAN adapters use up
to three resources to communicate with the computer system.
These are the IRQ (interrupt), I/O Base Address, and
on 8088/8086 machines, a RAM buffer area. The LAN adapter
board does not have the capability to share these resources.
This means that problems can occur if you try to share these
areas with other add-on boards or other parts of the
computer that use these resources.
Below is a description of the four resources and what
common devices use them. Use this as a guide when
installing a Western Digital LAN adapter.
You should not change the factory setting of the LAN adapter
if there are no conflicts with it. If necessary, it is a
simple matter to change to a different configuration.
The factory settings are: IRQ = 2 (TokenCard),
IRQ = 3 (TokenCard MASTER); I/O Base Address = A20
(hex); RAM Buffer Base Address = E0000 (hex) (TokenCard).
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SYSTEM RESOURCES USED BY LAN ADAPTER BOARDS
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(1) IRQ - Interrupt Request Channel
Use the chart below to determine which interrupt is best for the
LAN adapter board. If you cannot find any interrupts that are
available, you will have to remove something else from the system.
The Western Digital TokenCard (8005TR) and TokenCard WS (8005TRWS) can
select interrupt 2, 3, 4, 5, 6, or 7.
Western Digital TokenCard MASTER (8015TR) can select interrupt 3, 4, 5,
7, 9, 11, or 15.
Interrupt Other Devices That This IRQ May Not Be Available
(IRQ) Use This IRQ For Other Adapters If ...
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| 2 | (Usually available) | if EGA or VGA installed |
| 3* | COM2:, SDLC, BSC | if 2nd SERIAL PORT installed |
| 4 | COM1:, SDLC, BSC | if 1st SERIAL PORT installed |
| 5 | Hard Disk (in XTs) | in an XT with a hard disk --or-- |
| | LPT2: (in ATs) | an AT with a 2nd PARALLEL PORT |
| 6 | Floppy Disk | in any system with a floppy drive|
| 7 | LPT1: | if 1st PARALLEL PORT installed |
|-------------------------------------------------------------------|
| IRQs 9 through 15 are available only on AT computer systems. |
|-------------------------------------------------------------------|
| 9 | INT 0Ah (IRQ 2) | Software Redirected to IRQ 2 |
| 10 | (Usually available) | if other device occupies IRQ 10 |
| 11 | (Usually available) | if other device occupies IRQ 11 |
| 12 | (Usually available) | if other device occupies IRQ 12 |
| 13 | used by system | is the Coprocessor IRQ |
| 14 | used by system | Fixed Disk Controller |
| 15 | (Usually available) | if other device occupies IRQ 15 |
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(2) I/O Base Address
This is a special area in memory used by the computer system to
communicate with devices external to the microprocessor. These
addresses are always stated in hexadecimal (hex).
Western Digital TokenCard adapters use 16 decimal (10 hex)
consecutive I/O addresses starting at base address A20 or
base address 1A20. Western Digital TokenCard MASTER adapters
use 16 decimal (10 hex) consecutive I/O addresses starting at
base address A20, 1A20, 2A20, or 3A20. If the factory setting
of A20 is selected, for example, the adapter will use addresses
A20-A2F. If the setting of 1A20 is selected, the adapter will use
the address range 1A20-1A2F.
(3) RAM Buffer - Shared Memory Base Address
RAM buffer memory that resides on TokenCard adapter
boards is used for passing data to and from the adapter. This
buffer occupies memory space on 8088/8086 based systems only.
No PC memory space is used for buffer memory in systems with
a 286 or 386 processor. For 8088/8086 based systems,
you must select an area in your system's memory space above the
DOS 640K boundary where this buffer can reside without conflicting
with RAM or BIOS ROMs located on other add-on boards in your system.
In addition, adapters may optionally have a ROM installed on
the board for remote boot (IPL) and other functions. This ROM
occupies either 32 KBytes or 64 KBytes depending on how the
adapter is jumpered.
Western Digital TokenCard adapters have two jumper selections
for the I/O Base address. The RAM buffer on a TokenCard
(if used) occupies a space of 8 Kbytes and is coupled to the
I/O base address selected. The ROM area, if used, occupies a
space of 32 Kbytes or 64 Kbytes. It too is coupled to the I/O
base address:
I/O RAM Buffer 32K ROM 64K ROM
Range Memory Space Memory Space Memory Space
=============================================================
A20-A2F* E0000-E1FFF D0000-D7FFF D0000-DFFFF
1A20-1A2F E2000-E3FFF D8000-DFFFF D0000-DFFFF
* Factory Setting
The memory locations for the RAM and ROM memory are always
expressed in hexadecimal. 640K in hexadecimal is A0000.
(4) DMA Channel
This only applies to the TokenCard MASTER (8015TR), as this adapter
transfers data via DMA and is designed for use in AT-bus
computers. While the TokenCard (8005TR) may be used in an AT-bus
computer, the TokenCard uses shared memory, not DMA, for data transfer.
The Western Digital TokenCard MASTER (8015TR) has three jumper
selections for DMA channel selection: DMA channels 5, 6, and 7. If the
factory default channel selection of 5 cannot be used, change the setting
to either DMA channel 6 or 7 using jumper J7.