Re: TI-H: special component

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Re: TI-H: special component


Get a laptop mb.  Get a embedded PC board.  Get a sbc...  There are lots of
things you can do.

>That was kind of the idea. :> I'd buy a 386, cept that i want something
>nice and small...and unfortunately 386 MB's aren't small. Besides, i think
>it would be fun to build my own NIC out of a microcontroller. Course,
>prolly need some onboard SRAM for cacheing...but anyway :>
>
>-- Jon Olson
>
>At 10:09 AM 6/19/98 -0400, you wrote:
>>
>>Save yourself a huge amount of trouble, buy a 386 DX/8MB at a computer
>>or ham show, and get a cheap 10mbit nic. You can probably get everything
>>you need for under $80. Go home, install linux, and you're set. I think
>>doing this kind of thing from the ground up yourself would be like
>>trying
>>to redo 10 years of PC hardware and software development!
>>
>>Bryan
>>
>>Jon Olson wrote:
>>>
>>> Don't you think that the chip would however, get backlogged with data after
>>> a while? i mean...it could in theory bring in the data and send it back out
>>> that quickly, however if it's planning on doing anything real with the
>>> data, i don't think that this will work at all well. however, if you can
>>> find a way to make it work on a 10 Mhz network. Please tell me. I've been
>>> considdering building a little device that connects to a modem and to my
>>> dad's office network and allows me to dial in and execute various tasks
>>> (i.e. reboot my servers there, connect via telnet to some of the firewalled
>>> workstations, that kind of thing).
>>>
>>> At 08:33 AM 6/18/98 -0700, you wrote:
>>> >
>>> >On Thu, 18 Jun 1998, Jon Olson wrote:
>>> >
>>> >> Seeing as the PIC only operates at 10 Mhz and the network operates at
>100
>>> >
>>> >Just a minor technicality, but I think the high-end PICs max at 20MHz..
>>> >
>>> >They take 4 clock cycles to make an instruction cycle, so it's getting 5
>>> >MIPS. A 10 Mb/s (megabit) network (in theory) pushes 1.25 MB/s (megabyte)
>>> >of data. So if you had some sort of a shift register taking the data from
>>> >the network line and presenting it a byte at a time, then I think a 20
>>> >MHz PIC would be able to switch 10 Mb/s network traffic. (Did I calculate
>>> >all that correctly?) A 100 Mb/s network (also in theory) moves 12.5 MB/s
>>> >down the line. Since a PIC can read its I/O ports in a single instruction
>>> >cycle, it can take in 5 MB/s at 5 MIPS. So it has enough room left over to
>>> >push 10 Mb/s traffic back out another port, but it doesn't have enough
>>> >power to even read in a 100 Mb/s source without losing frames.
>>> >
>>> >So anyway, like Jon said, 100 Mb/s traffic is definitely out. But I think
>>> >10 Mb/s might be possible... unless I don't have a clue what I'm doing,
>>> >and that is also possible.
>>> >
>>> >--
>>> >Greg Hill
>>> >greg-hill@bigfoot.com
>>> >www.comports.com/link
>>> >
>>> >
>>
>>--
>>Bryan Rittmeyer
>>mailto:bryanr@flash.net
>>http://www.bridges.edu/horizon/
>>
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