19 Feb
1999
19 Feb
'99
12:40 a.m.
| Just for the sake of being picky... the DEQNA is based on an Intel
| microcontroller chip (something 8085-ish, I think). The ethernet chipset
| seems to be Fairchild (it's certainly got a big F on it.)
|
The DEQNA uses a Intel 8751 (an EPROM version of 8051 family). I suspect that
it may deal with the programming protocol and the ring buffers. The
chip with the F (with bars top and bottom of the letter) is probably
Fujitsu.
These boards had a fairly bad reputation for lockups and dropped packets.
There was a 20+ wire ECO along with a PAL chip (with 8 of the pins cut off)
soldered on top of another chip.
The replacement ethernet controller was the DELQA, which was a complete
redesign and used a 68000 processor.
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From Johnny Billquist <bqt(a)Update.UU.SE> Fri Feb
19 10:41:03 1999
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Date: Fri, 19 Feb 1999 01:41:03 +0100 (MET)
From: Johnny Billquist <bqt(a)Update.UU.SE>
To: Allison J Parent <allisonp(a)world.std.com>
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Subject: Re: Venix (was Re: 2.9BSD: mbuf.h)
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Hi, Alison.
<You might not be totally out. I also thought the
DEQNA was T-11 based,
<since the DEUNA is. :-)
I have a DEQNA in front of me. There is a micro and that is a 8751 8bitter.
The big chip is a LSI ASIC that is a linked list DMA controller. No t-11.
I'm sorry. I didn't mean to imply that you were wrong, just that I was.
The RQDXn(n={1,2,3} uses a t-11. The DELQA also does
not use a T-11.
Never looked carefully at RQDX?, but the DELQA uses an M68K, that much I
*do* know. (As do the DELUA)
Both use lots of logic in PALs and ASICs to perform
several state machines
needed for eithenet. At the time of development there were few complete
and fast enough chipsets for eithernet. The DEQNA is mid 80s design and
quite old.
You obviously knows more about this than I do. :-)
However, as I said, atleast the DELQA have an M68K...
And the DEQNA is old, yes...
The DEUNA is quite different.
Obviously. But it is also pretty old. Not as buggy though, which should
have been a clue. :-)
Johnny
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: bqt(a)update.uu.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
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