Installation guide

270 Installation Guide for Clients
io_port
Indicates the base I/O address for the network adapter. This entry
must match the adapter’s I/O address jumper settings. The entry is
ignored if adaptertype is Access/MC. For the Access/PC-8, the 8
possible choices for the I/O port base address are: 0x200, 0x240,
0x280, 0x2C0, 0x300, 0x340, 0x380, 0x3C0. For the Access/PC-16
there are 32 possible choices: 0x000, 0x020, 0x040, 0x060, 0x080,
0x0A0, 0x0C0, 0x0E0, 0x100, 0x120, 0x140, 0x160, 0x180, 0x1A0,
0x1C0, 0x1E0, 0x200, 0x220, 0x240, 0x260, 0x280, 0x2A0, 0x2C0,
0x2E0, 0x300, 0x320, 0x340, 0x360, 0x380, 0x3A0, 0x3C0, 0x3E0.
The adapter uses 32 sequential I/O port addresses starting at the base
address. That is, if you choose, for example, 0x300, the entire range
of addresses 0x300, 0x301, ..., 0x31F will be used by the adapter.
When you install an Access/PC-16 or Access/PC-8 adapter, you must
choose an I/O base address for it. You must choose it such that none
of the addresses in the corresponding range are already allocated to a
system I/O device or to another adapter which is installed in your
system. Then you set the jumpers on the adapter to select the base
address you’ve chosen, and you also specify that base address as the
value for the IO_Port parameter. Note that in many cases the default
base address (0x300) will be just fine, and you won’t have to change
the jumpers.
irq_level
Indicates the interrupt level of the network adapter. This entry must
match the adapter’s jumper settings. The entry is ignored if
adaptertype is Access/MC. For the Access/PC-8, the interrupt level
can be 2, 3, 4, 5, or 7. For the Access/PC-16, the interrupt level can
be 2, 3, 4, 5, 7, 10, 11, 12, or 15.
When you install an Access/PC-8 or Access/PC-16, you must choose
an IRQ level for the adapter. You must choose a level that is not
already allocated to a system I/O device or to another adapter which
is installed in your system. You set the jumpers on the adapter to
select the level you’ve chosen, and you also specify that level as the
value for the IRQ_Level parameter. In many system configurations
the default level (3) will be available, and you won’t have to change
the jumpers.
maxmulticast
Sets the maximum number of multicast addresses. This entry
configures the size of the multicast address table.
maxtransmits
Specifies the number of transmit-queue entries.
receivebuffers
If receivemethod is set to ReceiveChain, this entry specifies the
number of receive-buffer queue entries.