From drew@nagina.cs.Colorado.EDU Thu Jun 24 00:46:28 1993
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To: riscy@pyramid.com
Subject: UARTs, was : Re 2nd update
In-Reply-To: Your message of "Wed, 23 Jun 1993 15:15:00 MDT."
             <9306232215.AA08576@sword.eng.pyramid.com> 
Date: Wed, 23 Jun 1993 16:46:03 -0600
From: Drew Eckhardt <drew@nagina.cs.Colorado.EDU>
Status: RO
X-Status: 


    > >3.  What *other* uarts are out there?  In microlab, we used 
    > >	a nice DUART (same vintage as the 8250's) that was 
    > >	buffered.
    > 
    > Steve has been looking at these for a while. I believe he'd
    > gotten close to the "best" serial port he could find. Steve?
    
    The best I've seen is the Motorola MC68302, which has 3 serial ports
    capable of some very good speed.  However, this guy may be a little
    too expensive, since its also has a 68000 CPU core in it.

Add to cost the added complexity of programming, etc.  If our goal
is resonable, standard RS232 performance, which maxes out at 115.2
Kbaud, we're more than covered by the National Semi UARTS rated at 
1.5M baud. 

I just called the local national semi office and distributor : 

1.  National Semi doesn't make a four UART version of the 16550

2.  Here are the stats on the 2-port version : 

National Semi NS16C552V dual 16550 UART

Pricing :

Lots of 100 : $13.10
Sample quantities : $16.50

Package :  44 Lead Plastic Chip Carrier, about .65" X .65"

 
From caret@pyramid.com Thu Jun 24 03:06:51 1993
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From: caret@pyramid.com (Neil Russell)
Message-Id: <9306240106.AA09258@sword.eng.pyramid.com>
Subject: Re: UARTs, was : Re 2nd update
To: riscy@pyramid.com
Date: Wed, 23 Jun 93 18:06:33 PDT
In-Reply-To: <199306232246.AA01411@nagina.cs.Colorado.EDU>; from "Drew Eckhardt" at Jun 23, 93 4:46 pm
X-Mailer: ELM [version 2.3 PL11]
Status: RO
X-Status: 

> Add to cost the added complexity of programming, etc.  If our goal
> is resonable, standard RS232 performance, which maxes out at 115.2
> Kbaud, we're more than covered by the National Semi UARTS rated at 
> 1.5M baud. 
> 
> I just called the local national semi office and distributor : 
> 
> 1.  National Semi doesn't make a four UART version of the 16550
> 
> 2.  Here are the stats on the 2-port version : 
> 
> National Semi NS16C552V dual 16550 UART
> 
> Pricing :
> 
> Lots of 100 : $13.10
> Sample quantities : $16.50
> 
> Package :  44 Lead Plastic Chip Carrier, about .65" X .65"
> 

Sounds like we have our serial chip...


-- 
Neil Russell		(The wizard from OZ)
Pyramid Technology			Email:  caret@pyramid.com
3860 N. First Street			Voice:  (408) 428-7302
San Jose, CA 95134-1702			  FAX:  (408) 428-8845

 
From calica@cae.wisc.edu Thu Jun 24 05:13:47 1993
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From: Carlo J. Calica <calica@cae.wisc.edu>
Message-Id: <9306240314.AA00907@hprisc-25.cae.wisc.edu>
Subject: Re: UARTs, was : Re 2nd update
To: riscy@pyramid.com
Date: Wed, 23 Jun 93 22:14:51 CDT
Mailer: Elm [revision: 66.36.1.2]
Status: RO
X-Status: 

> > I just called the local national semi office and distributor : 
> > 
> > 1.  National Semi doesn't make a four UART version of the 16550
> > 
> > 2.  Here are the stats on the 2-port version : 
> > 
> > National Semi NS16C552V dual 16550 UART
> > 
> > Lots of 100 : $13.10
> 
> Sounds like we have our serial chip...
> 
Please be sure to use two for a total of 4 UARTs.  I'd like as many as
possible to hang terminals off of.

--
 /------------------------------+--------------------------------------\
| Carlo J. Calica               | Linux:  Choice of the GNU Generation  |
|     calica@cae.wisc.edu       | Dittos from the People's              | 
 \ University of Wisconsin      | Republic of Madison                  / 

 
From @cs.vu.nl:wfkonij@keg.cs.vu.nl Thu Jun 24 11:06:38 1993
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To: riscy@pyramid.com
Subject: Re: UARTs, was : Re 2nd update 
In-Reply-To: Your message of "Wed, 23 Jun 93 22:14:51 CDT."
             <9306240314.AA00907@hprisc-25.cae.wisc.edu> 
Date: Thu, 24 Jun 93 11:05:50 +0200
From: Willy Konijnenberg <wfkonij@keg.cs.vu.nl>
Message-Id:  <9306241105.aa22796@keg.cs.vu.nl>
Status: RO
X-Status: 

You wrote:
> > > National Semi NS16C552V dual 16550 UART
> > 
> > Sounds like we have our serial chip...
> > 
> Please be sure to use two for a total of 4 UARTs.  I'd like as many as
> possible to hang terminals off of.

Why would you want to put UARTs on the motherboard?  They don't consume
enough I/O bandwidth to justify hooking them up to the local bus.
If you include too many fancies, the board gets more complicated and
more expensive than it needs to be.
Better stick to things that need the bandwidth, like SCSI, ethernet, video.
If you want 16552 UARTs, build a simple ISA board with 4 sockets for them.

Not that my views are relevant, of course, as I am not going to design
the board, and very possibly won't even buy one.


-- 
	Willy Konijnenberg <wfkonij@cs.vu.nl>
	Department of Mathematics & Computer Science,
	Vrije Universiteit, Amsterdam, The Netherlands
 "You don't want to get locked into open systems" -- IBM

 
From caret@pyramid.com Fri Jun 25 18:44:35 1993
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From: caret@pyramid.com (Neil Russell)
Message-Id: <9306251644.AA01557@sword.eng.pyramid.com>
Subject: Re: UARTs, was : Re 2nd update
To: riscy@pyramid.com
Date: Fri, 25 Jun 93 9:44:18 PDT
In-Reply-To:  <9306241105.aa22796@keg.cs.vu.nl>; from "Willy Konijnenberg" at Jun 24, 93 11:05 am
X-Mailer: ELM [version 2.3 PL11]
Status: RO
X-Status: 

> Why would you want to put UARTs on the motherboard?  They don't consume
> enough I/O bandwidth to justify hooking them up to the local bus.
> If you include too many fancies, the board gets more complicated and
> more expensive than it needs to be.
> Better stick to things that need the bandwidth, like SCSI, ethernet, video.
> If you want 16552 UARTs, build a simple ISA board with 4 sockets for them.

Yup, but its much easier to debug the ISA bus hardware when you can
talk to the CPU.  Also, almost everyone will use at least one serial port
with this (for a mouse for X); I think it's justified.

-- 
Neil Russell		(The wizard from OZ)
Pyramid Technology			Email:  caret@pyramid.com
3860 N. First Street			Voice:  (408) 428-7302
San Jose, CA 95134-1702			  FAX:  (408) 428-8845

 
From trashcan!erik@utopia.hacktic.nl Sat Jun 26 21:32:21 1993
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From: erik@trashcan.hacktic.nl (Erik Bos)
To: riscy@pyramid.com
Subject: Re: UARTs, was : Re 2nd update
Date: Sat, 26 Jun 1993 16:12:00 +0611
X-Mailer: Rnf 0.75b
Status: RO
X-Status: 

caret@pyramid.com (Neil Russell) writes:

>> Why would you want to put UARTs on the motherboard?  They don't consume
>> enough I/O bandwidth to justify hooking them up to the local bus.
>> If you include too many fancies, the board gets more complicated and
>> more expensive than it needs to be.
>> Better stick to things that need the bandwidth, like SCSI, ethernet, video.
>> If you want 16552 UARTs, build a simple ISA board with 4 sockets for them.
>
>Yup, but its much easier to debug the ISA bus hardware when you can
>talk to the CPU.  Also, almost everyone will use at least one serial port
>with this (for a mouse for X); I think it's justified.
I agree, a serial for debugging would be very useful, Afterwards when you
don't need the uart for debugging anymore, it could be used for a mouse and
a modem.

--
Erik Bos (erik@trashcan.hacktic.nl)

 
