<s>
3Com	B-Device
3c509	I-Device
is	O
a	O
line	O
of	O
Ethernet	O
IEEE	O
802.3	O
network	O
cards	O
for	O
the	O
ISA	B-Architecture
,	O
EISA	B-Device
,	O
MCA	B-Device
and	O
PCMCIA	B-Architecture
computer	O
buses	O
.	O
</s>
<s>
The	O
3Com	O
3c5x9	O
family	O
of	O
network	O
controllers	O
has	O
various	O
interface	O
combinations	O
of	O
computer	O
bus	O
including	O
ISA	B-Architecture
,	O
EISA	B-Device
,	O
MCA	B-Device
and	O
PCMCIA	B-Architecture
.	O
</s>
<s>
For	O
network	O
connection	O
,	O
10BASE-2	O
,	O
AUI	B-Protocol
and	O
10BASE-T	B-Protocol
are	O
used	O
.	O
</s>
<s>
B	O
=	O
On	O
ISA	B-Architecture
and	O
PCMCIA	B-Architecture
adapter	O
numbers	O
indicates	O
that	O
these	O
adapters	O
are	O
part	O
of	O
the	O
second	O
generation	O
of	O
the	O
Parallel	O
Tasking	O
EtherLink	O
III	O
technology	O
.	O
</s>
<s>
The	O
DIP-28	B-Algorithm
(	O
U1	O
)	O
EPROM	B-General_Concept
for	O
network	B-Device
booting	I-Device
may	O
be	O
8	O
,	O
16	O
or	O
32	O
kByte	O
size	O
.	O
</s>
<s>
This	O
means	O
EPROMs	B-General_Concept
of	O
type	O
64	O
,	O
128	O
,	O
256	O
kbit	O
(	O
2^10	O
)	O
are	O
compatible	O
,	O
like	O
the	O
27C256	O
.	O
</s>
<s>
Boot	B-Device
ROM	I-Device
address	O
is	O
located	O
between	O
0xC0000	O
-	O
0xDE000	O
.	O
</s>
<s>
)	O
,	O
U6	O
:	O
70	O
ns	O
CMOS	B-Device
static	B-Architecture
RAM	I-Architecture
,	O
U1	O
:	O
DIP-28	B-Algorithm
27C256	O
style	O
EPROM	B-General_Concept
for	O
boot	O
code	O
,	O
U3	O
:	O
1024	O
bit	O
5V	O
CMOS	B-Device
Serial	O
EEPROM	B-General_Concept
(	O
configuration	O
)	O
.	O
</s>
<s>
Some	O
of	O
the	O
possible	O
ISA	B-Architecture
I/O	O
bases	O
are	O
0x280	O
,	O
0x300	O
,	O
0x310	O
,	O
0x320	O
,	O
0x330	O
,	O
0x340	O
,	O
0x350	O
.	O
</s>
<s>
The	O
driver	O
for	O
OpenBSD	B-Operating_System
,	O
NetBSD	B-Device
and	O
FreeBSD	B-Operating_System
is	O
"	O
ep	O
"	O
;	O
for	O
Linux	B-Application
it	O
is	O
"	O
eth	O
"	O
.	O
</s>
