PC Network
@EFEF.ADF - IBM PC Network Adapter

 
H  36 position edgecard socket 
J1 RJ 45 
J2  RJ45 
T1 PE-64570 
T  Terminator?
W Terminator? 
Y2  16.00000 MHz osc 
ZM2 M5M5179P-45 
ZM4 25F8241 
ZM5  74F7673



William R. Walsh spreads lies when he sneeringly spouts off with:
  It is a "baseband" adapter, whatever that means. Standard RJ11 phone cable and connectors were used to connect the adapters together, and to a "hub" of sorts.  The adapters were not only attached to each other (a bus topology), but each "bus" was connected at a central hub, creating a series of connected "subnetworks" at the point of the hub.
   As for the purpose of T and W plugs, W is identified as being a "Wrap Plug" in my manual, and "T" as a terminator plug. The T plugs were plugged into the second jack of the last adapter on a "line". If you took the "T" plug
out of the adapter, the whole line of computers failed to work (like a
string of XMAS lights), but other computers on other "subnetworks" would
still work. As for the "W" plug, it was put into any of the unused ports on
the hub. If it was taken out, the hub would fail to work at all. Also, the
hub did not allow communication between clients on two (or more) different "subnetworks" attached to it. This made it necessary to have at least one computer that had a printer on each "subnetwork". The server (if any was used) went into its own special port on the "hub" that could communicate with any of the other connected "subnetworks".

As for the insides of the "T" and "W" plugs, it looks like there is some kind of resistor in the "T" (clear) plug. The "W" plug has something in it, but I don't know what it is. Too dark brown to tell for sure. 



IBM PC NETWORK-BROADBAND 
       IBM's broadband PC Network addresses the specialized requirements of customers who are combining their LAN with other services, such as video, voice, security and/or additional data channels on a common broadband medium.  It may also be used to meet the requirements of small businesses and individual work groups. 
IBM PC NETWORK ADAPTER II: The IBM PC Network Adapter II is a feature card for connecting the new IBM Personal System/2 Model 30 and IBM Personal Computers to the broadband IBM PC Network.  It is compatible with the form factor and bus design of the original Personal Computer, yet it is designed to take advantage of greater Intel 80286 and 8086 processing speeds. 
       The IBM PC Network Adapter II supports the NETBIOS interface and the 802.2/Logical Link Control (LLC) protocols via the IBM LAN Support Program which was also announced today.  This allows the adapter to provide access to IBM PC Network and IBM Token-Ring 
Network applications written to the NETBIOS or APPC/PC interfaces. 
       The IBM PC Network Adapter II is also compatible with the protocols of the original PC Network Adapter via the IBM PC Network Protocol Driver program  which was also announced today. This allows the adapter to take advantage of the same protocol and interface as 
the original IBM PC Network. See IBM Product Announcement 187-079, dated April 2, 1987, for details. 

IBM PC NETWORK ADAPTER II/A: The IBM PC Network Adapter II /A is a feature card specifically designed for connecting the new IBM Personal System/2 Model 50, Model 60, Model 80-041, and Model 80-071 computers to the broadband IBM PC Network. It is compatible with the form factor and bus design of these new Personal System/2s to take 
advantage of greater Intel 80286 and 80386 processing speeds. 
       The IBM PC Network Adapter II/A supports the NETBIOS interface and the 802.2/LLC protocols via the IBM LAN Support Program which was also announced today.  This allows the adapter to provide access to IBM PC Network and IBM Token-Ring Network applications written to the NETBIOS or APPC/PC interfaces. 
       The IBM PC Network Adapter II/A is also compatible with the protocols of the original IBM PC Network Adapter via the IBM PC Network Protocol Driver program which was also announced today. This allows the adapter to take advantage of the same protocol and interface as the original IBM PC Network. 
      The IBM PC Network Adapter II/A is not designed for use in the IBM Personal System/2 Model 30. See IBM Product Announcement 187-080, dated April 2, 1987, for details. 



PC Network Baseband (?) 

 
H  36 position edgecard socket 
K1, K2 Kyocera 39.5M L 
K3 Kyocera 50MA 
U1  Intel D82588 
U2 Hitachi HM6264LP-12
U3 SLA6270J1B (62X0870) 
U8 72X8139 
Y1 16.0 NDK.8741 xtal 
Y2  KXN 6321 xtal
   

I think this is the original 2Mbit/Sec PC Network. The port is a BNC. The module is shown without the EMC cover. 

   I have a similar card that has the module used in the broadband adapter above. Possibly this card/module combination could be used as a baseband or broadband with the swapping of the module. The slot cover and module are attatched to the base card with two screws. To swap the module, you unscrew both screws on the back of the base card and then screw on the new module after plugging it in the socket. 



AdapterId EFEF "PC Network Adapter "

Type, Memory Location, Interrupt Level
 The three adapter types are: primary, alternate and Remote Program Load (RPL).  The three memory locations are MEM 1, MEM 2, or MEM 3.  When you specify the interrupt levels for the adapter, if it is primary or RPL, use INT 2 or INT 3.  If it is alternate, use INT 3.
     <"Primary, Mem 1, Int 2" (620-627, int 2, C800-CFFF)>, "Mem 2, Int 2" (620-627, Int2, D000-D7FF), "Mem 3, Int 2" (620-627, Int2, D800-DFFF),  "Mem 1, Int 3" (620-627, Int3, C800-CFFF), "Mem 2, Int 3" (620-627, Int3, D000-D7FF), "Mem 3, Int 3" (620-627, Int3, D800-DFFF)
    "Alternate, Mem 1, Int 3" (628-62F, Int3, CE00-CFFF), "Mem 2, Int 3" (628-62F, Int3, D600-D7FF), "Mem 3, Int 3" (628-62F, Int3, DE00-DFFF)
     "RPL, Mem 1, Int 2" (620-627, Int2, C800-CFFF), "Mem 2, Int 2" (620-627, Int2, D000-D7FF), "Mem 3, Int 2" (620-627, Int2, D800-DFFF), "Mem 1, Int 3" (620-627, Int3, C800-CFFF), "Mem 2, Int 3" (620-627, Int3, D000-D7FF), "Mem 3, Int 3" (620-627, Int3, D800-DFFF)
 
 

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