27 Dec
2006
27 Dec
'06
7:12 p.m.
On 12/27/06, Jeff Walther <trag at io.com> wrote:
This is a bit off-topic for the thread, but deals with the same
philosophy of selling question.
...
Well, I shopped on ebay for 8250 UART's. I saw 19 pieces listed for $0.75
each. I offered best offer of $0.50 each for all. Of course I was rejected,
but to my surprise the price was then raised to $2.75 a piece. I am not
sure whether it was a price error or a new model of business. Fortunately I
am not so eager to get those chips, and I bought some from others for $0.50
a piece.
vax, 9000
Jeff Walther
27 Dec
27 Dec
9:45 p.m.
9000 VAX wrote:
Well, I shopped on ebay for 8250 UART's. I saw 19
pieces listed for $0.75
Are those the ones with the 16-byte buffer, or were those only present
on the 16550a units?
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
10:10 p.m.
On 12/28/06, Jim Leonard <trixter at oldskool.org> wrote:
9000 VAX wrote:
If my memory is correct, 16 byte buffer exists on 16450 and 16550 UART
chips. The 8250 has only one byte buffer.
vax, 9000
--
Well, I shopped on ebay for 8250 UART's. I
saw 19 pieces listed for
$0.75
Are those the ones with the 16-byte buffer, or were those only present
on the 16550a units? Jim Leonard (trixter at oldskool.org)
http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
10:51 p.m.
9000 VAX wrote:
If my memory is correct, 16 byte buffer exists on
16450 and 16550 UART
chips. The 8250 has only one byte buffer.
Are either of the 16450/16550 a drop-in replacement for an 8250, or are
they not pin/command compatible?
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
11:09 p.m.
On 28 Dec 2006 at 0:51, Jim Leonard wrote:
9000 VAX wrote:
They're all pin-compatible. The 16450 supports higher line speeds;
the 16550 has the 16-byte FIFO.
Cheers,
Chuck
If my memory is correct, 16 byte buffer exists on
16450 and 16550 UART
chips. The 8250 has only one byte buffer.
Are either of the 16450/16550 a drop-in replacement for an 8250, or are
they not pin/command compatible? 
28 Dec
28 Dec
5:50 a.m.
Chuck Guzis wrote:
On 28 Dec 2006 at 0:51, Jim Leonard wrote:
And if I remember right, you don't need to even think about the 16-byte
FIFO - it does just look like an 8250 shunting out bytes as fast as it
can. Handy if your ISR doesn't like small fast bursts of data.
Gordon
9000 VAX wrote:
They're all pin-compatible. The 16450 supports higher line speeds;
the 16550 has the 16-byte FIFO. If my memory is correct, 16 byte buffer exists on
16450 and 16550 UART
chips. The 8250 has only one byte buffer.
Are either of the 16450/16550 a drop-in
replacement for an 8250, or are
they not pin/command compatible?
7:35 a.m.
On 28 Dec 2006 at 13:50, Gordon JC Pearce wrote:
And if I remember right, you don't need to even
think about the 16-byte
FIFO - it does just look like an 8250 shunting out bytes as fast as it
can. Handy if your ISR doesn't like small fast bursts of data.
There's also a 16560 with a 32-byte FIFO; somewhat harder to find.
Cheers,
Chuck
8:15 a.m.
New subject: UARTs (was ebay seller computermkt)
On Thu, 28 Dec 2006, Chuck Guzis wrote:
There's also a 16560 with a 32-byte FIFO; somewhat
harder to find.
A 16650, perhaps?
http://tldp.org/HOWTO/Serial-HOWTO-19.html
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://ripsaw.cac.psu.edu/~mloewen/Oldtech/
9:22 a.m.
New subject: UARTs (was ebay seller computermkt)
On 28 Dec 2006 at 11:15, Mike Loewen wrote:
On Thu, 28 Dec 2006, Chuck Guzis wrote:
Yes, I got my numbers mixed up. There's also a 16552, IIRC, which is
a 2-channel variant.
Cheers,
Chuck
There's also a 16560 with a 32-byte FIFO;
somewhat harder to find.
A 16650, perhaps? 
8:38 a.m.
On Thu, 28 Dec 2006, Chuck Guzis wrote:
Date: Thu, 28 Dec 2006 07:35:18 -0800
From: Chuck Guzis <cclist at sydex.com>
Reply-To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at
classiccmp.org>
Subject: Re: ebay seller computermkt
On 28 Dec 2006 at 13:50, Gordon JC Pearce wrote:
16650...
There are also 16C750's and 16C850s and multi channel varients with 64 and 128
byte FIFOs, Not sure how many of these are still available in DIPS (Exar is
one source)
Peter Wallace
And if I remember right, you don't need to
even think about the 16-byte
FIFO - it does just look like an 8250 shunting out bytes as fast as it
can. Handy if your ISR doesn't like small fast bursts of data.
There's also a 16560 with a 32-byte FIFO; somewhat harder to find.
Cheers,
Chuck
3:04 p.m.
Chuck Guzis wrote:
They're all pin-compatible. The 16450 supports
higher line speeds;
the 16550 has the 16-byte FIFO.
How much higher line speeds? Higher than 115200?
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
4:16 p.m.
On 28 Dec 2006 at 17:04, Jim Leonard wrote:
Chuck Guzis wrote:
Argh! Both "bus" and "line". The 16450A is capable of 500K, using
an 8 MHz baud clock. I don't think the original 8250 could go that
high. Bus timing is faster too.
Finding an original 8250(A) datasheet is a little daunting, however.
NS has lumped the 16450 and 8250 as one part now.
Even more interesting is the list of "personality" bugs between the
various NS parts and competing vendors.
Cheers,
Chuck
They're all pin-compatible. The 16450
supports higher line speeds;
the 16550 has the 16-byte FIFO.
How much higher line speeds? Higher than 115200?
5:55 p.m.
Chuck Guzis wrote:
Argh!
Sorry, just trying to learn...
Thanks for the info!
--
Jim Leonard (trixter at oldskool.org) http://www.oldskool.org/
Help our electronic games project: http://www.mobygames.com/
Or check out some trippy MindCandy at http://www.mindcandydvd.com/
A child borne of the home computer wars: http://trixter.wordpress.com/
11:40 p.m.
Hi
Check his shipping cost. I can't imagine how a manual
could cost $41 to ship.
Check his other sales. Most are also unrealistic as well.
Of course, if he sells anything, it would pay for his time.
Dwight
From: Grant Stockly <grant at stockly.com>
For a real good one, check this e-bay auction...
200063316479
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29 Dec
29 Dec
3:13 a.m.
For a real good one, check this e-bay auction...
200063316479
$199 for a SV318??? What this guy is smoking? Can I have some? This is
the strong brand! :oD
(of course, I'm kidding about having some, but surely this is the
stronger thing I've ever seen someone smoking!!!)
:oD
10:24 a.m.
Alexandre Souza wrote:
If you think that's nuts, there is a guy selling a Kaypro II for
$25,000. I don't have the auction # handy though.
g.
For a real
good one, check this e-bay auction...
200063316479
$199 for a SV318??? What this guy is smoking? Can I have some? This
is the strong brand! :oD
(of course, I'm kidding about having some, but surely this is the
stronger thing I've ever seen someone smoking!!!)
:oD 
6:28 a.m.
On Thu, 28 Dec 2006 22:26:58 -0900, Grant Stockly wrote:
For a real good one, check this e-bay auction...
200063316479
An asking price is just that an ASKing price ...
Looking at what he sold in the last few weeks .....
DEC 19 - Dec 29 10 days, 20 items and 9 sold with Best offers.
Totals just shy of $1800 plus about $300 more in shipping.
His feedback shows only 2 hits out of 424 as a seller both for shipping problems in 2.5
years.
Vintage Bell & Howell Apple II Plus Works! 299.00 -
17.60
Vintage Tandy PC 1000 SX Works!!! 199.00 - 17.13
Vintage Franklin Ace 1000 Computer Works!!! 125.00 - 23.11
BO
Rare Apple II C w Power Supply Works!!! 100.00 - 23.11
BO
Rare Compaq Portable III Computer Works!!! 100.00 - 18.23
BO
Rare Epson HX-20 Computer w/Expansion Unit 100.00 - 18.71 BO
Rare HP Vectra 486-25N Computer Works!!! 99.99 - 15.90
Rare Hewlett Packard Vectra 486/33 DX Computer Works!!! 99.99 - 16.35
Rare TRS-80 16K level II mdl 26-1006 99.99 -
8.98
IBM 4869 External 5 1/4" 360K disk drive w/box/Manual 80.00 - 13.00
BO
IBM RS/1 System Software Package Complete 5 1/4 75.00 - 3.99 BO
Rare Leading Edge Mdl D w/Intel 8088 works!!! 69.99 - 15.89
Rare Commodore Pet 8032 Motherboard w/Visicalc Board 65.00 - 12.90 BO
Vintage IBM PS/ValuePoint 466DX2/SI Works!! 50.00 - 22.11
Rare Compaq DeskPro 286N w/Intel 80286-12 50.00 - 15.90
BO
Vintage IBM Mdl F Clicky 15 Pin Keyboard New nice!!! 49.99 - 20.11 BO
BACKUP COPY OF CompuStar CP/M DISK 39.99 - 4.00
Very Rare Byte Magazine June 1978 29.99 -
3.99
The SuperCars Game Software IBM PC 5 1/4 1989 NIB 19.99 - 14.20
The Original IBM Basic Users Handbook 1984 18.99 - 6.05
Not a bad Christmas ... Mabe I will do it next year, with my junk :-)
Bob Bradlee
28 Dec
28 Dec
10:44 a.m.
9000 VAX wrote:
If my memory is correct, 16 byte buffer exists on
16450 and 16550 UART
chips. The 8250 has only one byte buffer.
Are either of the 16450/16550 a drop-in replacement for an 8250, or are
they not pin/command compatible? From what _I_ rememebr, the 16450 is a direct
replacement for the 8250,
and has only th 1-byte buffer. The 16550 has the 16 byte
FIFO and is pin
compatible with the 8250 (and after reset the FIFO is disabled so it
works like a 8250 too).
Replacing 8250s with 16550s was a common upgrade on PC serial cards some
years ago. It used to be claimed the upgrade was only possbile if the
8250 was socketed, needless to say that didn't bother me. The serial card
in this PC has been upgraded that way...
-tony
1:37 a.m.
----- Original Message -----
From: "9000 VAX" <vax9000 at gmail.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk at classiccmp.org>
Sent: Wednesday, December 27, 2006 10:12 PM
Subject: Re: ebay seller computermkt
On 12/27/06, Jeff Walther <trag at io.com>
wrote:
rejected,
This is a bit off-topic for the thread, but deals with the same
philosophy of selling question.
...
Well, I shopped on ebay for 8250 UART's. I saw 19 pieces listed for $0.75
each. I offered best offer of $0.50 each for all. Of course I was but to my surprise the price was then raised to $2.75
a piece. I am not
sure whether it was a price error or a new model of business. Fortunately
I
am not so eager to get those chips, and I bought some
from others for
$0.50
a piece.
vax, 9000
> Jeff Walther
>
The seller probably thinks you only needed a few for a dead machine and
jacked up the individual price. For smaller hard to find items it seems
ebayers tend to keep them high and collect dust looking for somebody in
desperate need then to sell them for a low price that is not worth their
time.
I had problems trying to find 68K Mac VRAM SIMMs cheap on ebay (I needed the
slot in a machine for a card and decided to bump up the VRAM onboard instead
of using a separate card), I had to go to LEM Swap where people just about
give those items away since they generally don't care about the video color
depth on their machines, or if they do they get a decent video card. Granted
they are not that common, but $15 shipped for a couple sticks (especially
when the machine I wanted to upgrade needed 4 of them) is way too much.
6568
days inactive
6569
days old
19 comments
13 participants
participants (13)
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