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Apple //e RGB Card's TTL Logic
- Subject: Apple //e RGB Card's TTL Logic
- From: "Bryan Parkoff" <nospam@nospam.com>
- Date: Thu, 01 Sep 2005 21:31:49 GMT
- Newsgroups: comp.sys.apple2
- Organization: SBC http://yahoo.sbc.com
- Xref: g2news1.google.com comp.sys.apple2:5240
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 Parkoff