Re: Apple //e RGB Card's TTL Logic

[salfter@salfter.diespammersdie.dyndns.org (Scott Alfter)]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

In article <9rKRe.2281$nB6.73@newssvr30.news.prodigy.com>,
Bryan Parkoff <nospam@nospam.com> wrote:
>    I am unable to obtain TTL information to see the inside chip.  Google 
>search is complicated.  Do you know where can I find TTL chip directory 
>which it has all pinout inside chip?  It is an example of SN74LS173AN chip. 

Google is your friend:

http://www.google.com/search?q=74LS173

The first link goes to a PDF of a datasheet.

>Are you sure that different manufacturers make the same chip design using 
>model such as 74LSxxxx.  I am not sure if SN74LS is same as 74LSxxxx.

"SN" is a manufacturer prefix.  IIRC, Texas Instruments uses that prefix. 
You can replace any manufacturer's 74LSxxx with another's 74LSxxx; they are
considered electrically and functionally equivalent.  When dealing with
different classes (74LSxxx vs. 74HCTxxx, for instance), while the parts are
often not electrically equivalent, they remain functionally equivalent (a
74LS00 and 74HCT00 are both quad 2-input NAND gates).

  _/_
 / v \ Scott Alfter (remove the obvious to send mail)
(IIGS( http://alfter.us/            Top-posting!
 \_^_/ rm -rf /bin/laden            >What's the most annoying thing on Usenet?

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.0 (GNU/Linux)

iD8DBQFDGH6OVgTKos01OwkRAqFfAJ9mzRR/EM3hpszyrx9HzB13J2wUlwCbBE42
coG8C8GG+/CyFN8ish1Zojc=
=Q6Wx
-----END PGP SIGNATURE-----