20 Jan
2003
20 Jan
'03
10:31 a.m.
Hi,
To get back to computers for a change...
While looking for some op-amp chips earlier I came across a
couple of 8751s (labelled Intel '80). A quick google search
failed to turn up a data sheet, anyone any ideas where I can
look?
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
20 Jan
20 Jan
12:28 p.m.
Stan Barr wrote:
While looking for some op-amp chips earlier I came
across a
couple of 8751s (labelled Intel '80). A quick google search
failed to turn up a data sheet, anyone any ideas where I can
look?
IIRC, the 8751 is an EPROM (windowed package) version of the 8051 MCU. The
thing about the 8051 (and the 8052) is that it can also be used as a CPU -
add a 74LS573 (or 74LS373) latch and a bit of decoding and you can disable
the internal program memory and use external memory instead. I use
8051-derivatives a fair bit - Atmel's AT89S8252 is a particularly nice
chip - basically an 8052 with 8k of internal FLASH memory and an SPI
programming interface.
Later.
--
Phil.
philpem(a)dsl.pipex.com
http://www.philpem.dsl.pipex.com/
3:06 p.m.
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21 Jan
21 Jan
8:51 a.m.
Hi,
Thanks for all the info everyone.
I have some info on the 8051 somewhere so I'll dig that out.
I don't know if I'll actually be doing anything with them but its
nice to know what they are, and they could come in handy.
(They're ceramic package with a rectangular quartz window BTW)
--
Cheers,
Stan Barr stanb(a)dial.pipex.com
The future was never like this!
8:58 p.m.
On Tuesday, January 21, 2003, at 04:12 AM, Stan Barr wrote:
Thanks for all the info everyone.
I have some info on the 8051 somewhere so I'll dig that out.
I don't know if I'll actually be doing anything with them but its
nice to know what they are, and they could come in handy.
(They're ceramic package with a rectangular quartz window BTW)
These are good little processors. Some folks don't care for the
instruction set, but I like it ok. I'm making my living these days
doing embedded systems development on [mostly] 8051-series processors.
They're kinda an "old standby"...they never let me down.
-Dave
--
Dave McGuire "Wear whatever you want...Just don't be surprised
St. Petersburg, FL if you wind up with a blow-gun dart in your
prosthetic boobies." -Kurt Huhn
23 Jan
23 Jan
1:40 p.m.
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5:42 p.m.
On Thursday, January 23, 2003, Tony Duell wrote:
The original 8051 really suffers from only having one
16 bit DPTR (data
address register). This has been corrected on some of the improved
versions now available, but code written for those is no longer portable
to all 8051 derivatives.
I wrote a bit of firmware for the Dallas DS80C520, one of the improved
versions. It was great fun. There is a *lot* of functionality packed into
that chip.
--
Jeffrey Sharp
24 Jan
24 Jan
11:37 p.m.
On Thursday, January 23, 2003, at 11:27 PM, Jeffrey Sharp wrote:
I'm currently looking at the DS80C400. That is one scary chip.
Hardware math accelerator, 10/100Mbps ethernet controller, TCP/IP stack
and multitasking OS primitives in on-chip ROM...most impressive.
This is a microcontroller that can, no shit, boot its firmware via
DHCP and TFTP.
-Dave
--
Dave McGuire "Wear whatever you want...Just don't be surprised
St. Petersburg, FL if you wind up with a blow-gun dart in your
prosthetic boobies." -Kurt Huhn
The original
8051 really suffers from only having one 16 bit DPTR
(data
address register). This has been corrected on some of the improved
versions now available, but code written for those is no longer
portable
to all 8051 derivatives.
I wrote a bit of firmware for the Dallas DS80C520, one of the improved
versions. It was great fun. There is a *lot* of functionality packed
into
that chip. 
25 Jan
25 Jan
3:42 a.m.
I'm currently looking at the DS80C400. That is
one scary chip.
Hardware math accelerator, 10/100Mbps ethernet controller, TCP/IP stack
and multitasking OS primitives in on-chip ROM...most impressive.
This is a microcontroller that can, no shit, boot its firmware via
DHCP and TFTP.
That sounds like a very interesting microcontroller.
--
Eric Dittman
dittman(a)dittman.net
Check out the DEC Enthusiasts Club at http://www.dittman.net/
8:02 a.m.
Dave McGuire wrote:
I'm currently looking at the DS80C400. That is
one scary chip.
Hardware math accelerator, 10/100Mbps ethernet controller, TCP/IP
stack and multitasking OS primitives in on-chip ROM...most impressive.
I've got
some samples. Unfortunately it's beginning to look like I might
have to buy and cannibalise an Ethernet card. Unless someone here has a
spare they want rid of. I need the Ethernet interface transformer and RJ45
socket to be intact at the very least.
This is a microcontroller that can, no shit, boot
its firmware via
DHCP and TFTP.
That settles it - I've got a spare 256kbit RAM lying around
somewhere that's
just begging to be used, plus I've got a spare MAX233 (SOIC SMD) and some
odd-job parts. This 80C400 is getting turned into a webserver :-)
Later.
--
Phil.
philpem(a)dsl.pipex.com
http://www.philpem.dsl.pipex.com/
10:09 p.m.
On Sat, 25 Jan 2003, Philip Pemberton wrote:
Dave McGuire wrote:
I think one of my local surplus dealers still has a bin of those pulse
transformers. How many are you looking for? I also don't know what the
normal price for these should be, and normally they don't have a fixed
price either...
Since we are on the subject of ethernet parts, does anyone know of a
source for 8392 chips in a standard dip package? One local surplus dealer
in town has a ton, but they think they are worth $20+/ea, so I need to
find a source for at least a couple parts.
-Toth
I'm currently looking at the DS80C400. That
is one scary chip.
Hardware math accelerator, 10/100Mbps ethernet controller, TCP/IP
stack and multitasking OS primitives in on-chip ROM...most impressive.
I've got some samples. Unfortunately it's beginning to look like I might
have to buy and cannibalise an Ethernet card. Unless someone here has a
spare they want rid of. I need the Ethernet interface transformer and
RJ45 socket to be intact at the very least. 
22 Jan
22 Jan
noon
You gotta be kidding!
The 8751 is an EPROM version of the 8051, the most popular
microprocessor ever made
(in terms of sheer numbers that is).
Checkout 8051.com for starters.
Stan Barr wrote:
Hi,
To get back to computers for a change...
While looking for some op-amp chips earlier I came across a
couple of 8751s (labelled Intel '80). A quick google search
failed to turn up a data sheet, anyone any ideas where I can
look?
23 Jan
23 Jan
9:02 a.m.
On Wednesday, January 22, 2003, at 06:06 PM, Bob Shannon wrote:
You gotta be kidding!
The 8751 is an EPROM version of the 8051, the most popular
microprocessor ever made
(in terms of sheer numbers that is).
I read a very interesting statistic in an issue of Circuit Cellar Ink
a little less than a year ago. Apparently 8051 (and 8051 derivative)
processors are produced in quantities in excess of one million per day.
Yes, per DAY.
The air conditioner in my office has an 8051 in it. I have a Cisco
Catalyst 5000 network switch in my computer room...each and every board
on its bus has an 8032 (which is a ROM-less 8052, which in turn is a
"bigger" 8051) on it. The list goes on and on.
-Dave
--
Dave McGuire "Wear whatever you want...Just don't be surprised
St. Petersburg, FL if you wind up with a blow-gun dart in your
prosthetic boobies." -Kurt Huhn
2:52 p.m.
Stan Barr wrote:
...I came across a couple of 8751s (labelled Intel '80). A quick google
search
failed to turn up a data sheet, anyone any ideas where
I can look?
I was at Borders bookstore today browsing through the electronics shelf
and saw a large book that seemed to have everything you would to know about
8751's, including about 20 projects, right down to pc board layouts.
Paul Pennington
Augusta, Georgia
7849
days inactive
7855
days old
13 comments
9 participants
participants (9)
-
ard＠p850ug1.demon.co.uk -
bshannon＠tiac.net -
dittman＠dittman.net -
jss＠subatomix.com -
mcguire＠neurotica.com -
paulpenn＠knology.net -
philpem＠dsl.pipex.com -
stanb＠dial.pipex.com -
tothwolf＠concentric.net