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PICList Thread
'[PIC]: 8743 Peripheral Controller & PIC'
2001\04\29@163654 by Mike Laurin

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Hi all,

I was stripping an old PC keyboard ( I got for $1) for parts (lots of buttons, LEDs, chips, etc...). I get alot of my components this way, buying old junk and stripping it.  Anyways, I found an INTEL 8743DP controller chip on it (circa 1980).  I checked out the web but theres nothing on this chip (no datasheets).  It appears to be obsolete.  I remember reading somewhere that someone got started in microcontrollers using these types of keyboard chips because they have everything in them like PICs do.

Just wondering if anyone knows anything about this particular chip or where I might find old archived datasheets.  I just want to see if its at all possible to use it in some way with a PIC.

I dont know if this means anything, I thought it strange, but the chip says Intel on it and it has the AMD arrow logo on it as well.

TTYL
Mike

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2001\04\29@172315 by Bob Ammerman

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The chip you have is an OTP or ROM microcontroller. Originally designed by
Intel, it was second sourced by AMD.

Bob Ammerman
RAm Systems
(contract development of high performance, high function, low-level
software)

{Original Message removed}

2001\04\29@235859 by Dale Botkin

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On Sun, 29 Apr 2001, Mike Laurin wrote:

> I was stripping an old PC keyboard ( I got for $1) for parts (lots of
> buttons, LEDs, chips, etc...). I get alot of my components this way,
> buying old junk and stripping it.  Anyways, I found an INTEL 8743DP
> controller chip on it (circa 1980).  I checked out the web but theres
> nothing on this chip (no datasheets).  It appears to be obsolete.  I
> remember reading somewhere that someone got started in
> microcontrollers using these types of keyboard chips because they have
> everything in them like PICs do.

Sure it's not an 8748?

I used to work a lot with 8741, 8742, etc.  Not too bad, a little EPROM, a
tiny amount of RAM, nothing special.  Plenty of free support (TASM,etc)
for software development.  They're basically "little brothers" to the
8051.  If yours came out of a keyboard I'm almost sure it would be mask
programmed -- though an 874x indicates EPROM part.  Any chance that's the
date code?  Anyway, the pinout is probably 8047/8048 compatible.  If you
must, I think you can disable the internal ROM and use external memory
though you'll have to latch the address...  it's been a LONG time since I
used one and the data sheet is buried deep in my garage, so don't take my
word for it.

All in all, I'd much rather use a 16F84 or a '628 instead.

Dale
---
The most exciting phrase to hear in science, the one that heralds new
discoveries, is not "Eureka!" (I found it!) but "That's funny ..."
               -- Isaac Asimov

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2001\04\30@001547 by Alexandre Domingos F. Souza

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>Sure it's not an 8748?

       I remembered seen this in an MCS-48 Datasheet. I think it was a dedicated Keyboard Controller. But 8743? I think I read 8043. Does it have the transparent window on top, like an EPROM?

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2001\04\30@015424 by Mike Laurin

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----- Original Message -----
From: Alexandre Domingos F. Souza <.....taitoKILLspamspam@spam@TERRA.COM.BR>
To: <PICLISTspamKILLspamMITVMA.MIT.EDU>
Sent: Sunday, April 29, 2001 9:18 PM
Subject: Re: [PIC]: 8743 Peripheral Controller & PIC


>Sure it's not an 8748?

>        I remembered seen this in an MCS-48 Datasheet. I think it was a
dedicated Keyboard Controller.
> But 8743? I think I read 8043. Does it have the transparent window on top,
like an EPROM?

It definitely is a 8743 (reads: D TEK 8743DP on chip) and you may be right
about it being a dedicated keyboard chip.
It has no EPROM window so my guess is OTP.
Like I said before, Im just scrounging for parts and wondered if I could
make use of this one or not. No big deal, but thanks to everyone for
responding.

Take Care,
Mike.

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