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

["Bill Garber" <willy46pa@comcast.net>]

"Bryan Parkoff" <nospam@nospam.com> wrote in message 
news:9rKRe.2281$nB6.73@newssvr30.news.prodigy.com...
>    There is no Apple //e RGB Card's schematic existence.  I am able to 
> draw my own schematic from scratch by looking at Apple //e RGB Card's TTL 
> chips and wiring traces.  I need to use information by converting from 16 
> colors' 4 bits to R, G, B, and H/V sync.
>    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. 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.
>    I am not an electronic expert, but I have knowledge of basic electronic 
> including Ohm's Law and Digital Circuit.
>    I am interested to sample 16 color 4 bits data from address bus 16 bits 
> and data bus 8 bits into R, G, B data and H/V sync data.  I use R, G, B 
> and H/V sync to construct correct color which it is very fine resolution 
> than NTSC resolution on Emulator project.
>    I can tell that double high resolution color data is always wrong in 
> most emulator projects, but it is very close.  I believe that RGB Card 
> helps to provide me the information so it helps to construct double high 
> resolution color data 100% accurate from RGB Card.
>    Can you please help leading me to the proper electronic website?  It 
> would help me to get deep information about TTL chips.


Bryan, a quick Google search for 74LS173 got me this on the
first item of the list. Google usually brings me a datasheet
in the first 5 items in the list.

http://ee.usc.edu/library/ee459/datasheets/74LS173.pdf

Bill Garber