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ttnn -- Device Driver


/ddeevv/ttnn* provides  access to an  ARCNET local area  network via a  Tiac 236
card,  Tiac 238  card or  equivalent (e.g., Pure  Data ARCNET  card).  Each
entry  is  assigned major  device  number  20, and  may  be  accessed as  a
character-special device.

The ttnn driver supports up to four ARCNET cards in a single computer.  Minor
devices 0, 1, 2, and 3 refer to each card.  For a card to work properly, it
must  have a  unique interrupt,  64-kilobyte memory  bank, and  port number
assigned to it.  The driver must  also be configured to the same interrupt,
memory bank, and port number.  You can use the command /ccoonnff/ppaattcchh to build
a properly configured version of the kernel; see the Lexicon article hhss for
sample  commands.   If  loadable  device  drivers  are  used  they  may  be
configured in the identical fashion.

For an interface  to be accessible from the COHERENT  system, a device file
must  be present  in directory  /ddeevv with the  appropriate type,  major and
minor device  numbers, and permissions.   You can use the  command mmkknnoodd to
creates a special file for a device, as follows:

/eettcc/mmkknnoodd /ddeevv/ttnn00  cc 2200   00
/eettcc/mmkknnoodd /ddeevv/ttnn11  cc 2200   11

It is  usual to have a  generic LAN interface /ddeevv/ttnn.   This is associated
with a particular LAN card by the following command:

/bbiinn/llnn -ff /ddeevv/ttnn00  /ddeevv/ttnn

This device  driver provides  a raw interface  to the LAN.   To communicate
with other computers  on the network, it is normally  necessary to add some
higher level protocol (e.g., XNS or TCP/IP).

_F_i_l_e_s
/ddeevv/ttnn* -- LAN network access special file
/ddeevv/ttnn -- Default LAN

_S_e_e _A_l_s_o
ddeevviiccee ddrriivveerrss, llnn, mmkknnoodd

_N_o_t_e_s
As  delivered, the  LAN driver  supports  one card  with interrupt  2, port
0x2E0, and bank 0xD000.

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