[ct-user] Ethernet

[David Robbins]

i now recommend setting the packet driver sw interrupt to 0x6f (111
decimal).  this is out of the range that ct uses for various com ports
and stuff.  ct looks for comtsr1 through comtsr4 at sw interrupts 97
through 100 respectively.  so if you set the ethernet packet driver to
99 you will not be able to use comtsr3 if you wanted to.  i set nettsr
to 100 by default to replace comtsr4.

the difference of 1 between the suggested ranges is not important, just
a coincidence.  the problem is caused when the packet driver sw
interrupt conflicts with one of the ones used by ct to talk with nettsr,
comtsr*, or the dvptsr.

Stuparits, Jeff wrote:
> 
> In recently working on the Ethernet system at NQ4I, I ran across a problem
> that may be of interest to others working on replacing the CT RS-232 loop
> with Ethernet.  When starting CT with the Ethernet Network enabled, CT would
> hang as soon as the log entry screen popped up.  After many hours of head
> scratching, I noticed that the Ethernet card manufacturer listed their
> software interrupt range as at 96 -128.  NETTSR suggested 97 - 100.  (The
> starting offset between the two was 1).  When I set the Ethernet card to 99
> and NETTSR to 100, the Network worked perfectly.
> 
> Rick purchased the new ISA bus cards from Fry's Electronics in Los Angeles
> for $9 each (includes BNC Tee), but I believe similar units are available
> from vendors listing at http://www.pricewatch.com.  RG-58 cables were $4,
> terminators $2.  For about $80 we equipped 6 station computers.
> 
> We plan on using Com 5, IRQ 10, and I/O address space of 320h for the
> network.
> 
> Thanks to K1TTT for NETTSR !
> 
> Jeff W4DD
> ex WB8HDD
> 
> 
> 
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-- 
David Robbins K1TTT (ex KY1H)
k1ttt@berkshire.net   or   robbins@berkshire.net
http://www.berkshire.net/~robbins/k1ttt.html

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