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Forum index » Electronix » components
Looking for MM5740 datasheet (keyboard encoder)
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Tilmann Reh
electronics forum addict


Joined: 12 May 2005
Posts: 59

PostPosted: Mon Jul 03, 2006 10:05 am    Post subject: Looking for MM5740 datasheet (keyboard encoder) Reply with quote

Xp + Fup2 s.e.components

Hello,

does anyone have a datasheet of the MM5740 keyboard encoder, formerly
made by NSC (around the late 70s)?
It was used in early versions of the Apple II, but later replaced by
another encoder since it became obsolete...

Thanks,

--
Dipl.-Ing. Tilmann Reh
http://www.autometer.de - Elektronik nach Maß.
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Tony Williams
electronics forum Guru


Joined: 01 May 2005
Posts: 374

PostPosted: Mon Jul 03, 2006 12:57 pm    Post subject: Re: Looking for MM5740 datasheet (keyboard encoder) Reply with quote

In article <44a8ebdc$0$29125$9b4e6d93@newsread4.arcor-online.net>,
Tilmann Reh <tilmannreh@despammed.com> wrote:

Quote:
does anyone have a datasheet of the MM5740 keyboard encoder,
formerly made by NSC (around the late 70s)? It was used in early
versions of the Apple II, but later replaced by another encoder
since it became obsolete...

Not a data sheet, but the MM5740 is mentioned and
drawn in a PROM application brief ( 4 pages) in
the NatSemi Memory Applications Handbook (1978).
There is a hint that it is a precis of an app note,
AN-80, "MOS Keyboard Encoding" by Dom Richiuso.

--
Tony Williams.
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Tilmann Reh
electronics forum addict


Joined: 12 May 2005
Posts: 59

PostPosted: Mon Jul 03, 2006 1:05 pm    Post subject: Re: Looking for MM5740 datasheet (keyboard encoder) Reply with quote

Tony Williams schrieb:

Quote:
does anyone have a datasheet of the MM5740 keyboard encoder,
formerly made by NSC (around the late 70s)? It was used in early
versions of the Apple II, but later replaced by another encoder
since it became obsolete...

Not a data sheet, but the MM5740 is mentioned and
drawn in a PROM application brief ( 4 pages) in
the NatSemi Memory Applications Handbook (1978).
There is a hint that it is a precis of an app note,
AN-80, "MOS Keyboard Encoding" by Dom Richiuso.

I have neither that handbook nor that app note...

Could you provide it (as fax or scan), in case noone else has the data
sheet?

Thanks,

--
Dipl.-Ing. Tilmann Reh
http://www.autometer.de - Elektronik nach Maß.
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Tony Williams
electronics forum Guru


Joined: 01 May 2005
Posts: 374

PostPosted: Tue Jul 04, 2006 7:49 am    Post subject: Re: Looking for MM5740 datasheet (keyboard encoder) Reply with quote

In article <44a91623$0$26272$9b4e6d93@newsread2.arcor-online.net>,
Tilmann Reh <tilmannreh@despammed.com> wrote:

Quote:
Could you provide it (as fax or scan), in case noone else has the
data sheet?

Email your snailmail address.

I'll just slice the pages out and post them.

--
Tony Williams.
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Doug Mac
electronics forum beginner


Joined: 26 Jul 2006
Posts: 2
Location: USA

PostPosted: Wed Jul 26, 2006 3:33 am    Post subject: Datasheet for the MM5740
Subject description: I have the datasheet from a NSC 1974 catalog
Reply with quote

To all in this forum from an old bytepusher
I have on my shelf ( I do not believe it my self) the datasheet for the MM5740 that you are looking for, however I will have to scan it in to a pdf or gif format. Tony send me a email at douglas2355 at yahoo dot com and I will reply in the near future with an attachement.

Doug Mac
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Doug Mac
electronics forum beginner


Joined: 26 Jul 2006
Posts: 2
Location: USA

PostPosted: Wed Jul 26, 2006 3:39 am    Post subject: Reply with quote

Sorry Tony and Tilmann
I ment for Tilmann Reh to send me a email at douglas2355 at yahoo dot com and I will reply in the near future with an attachement.

Doug Mac
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