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315-5433 pinouts?
Posted: Sun Dec 09, 2012 5:08 pm
by Charles MacDonald
Do we have any kind of pinouts for this chip, even partial ones?
I'm curious which pins are for the third I/O port.
Posted: Wed Dec 12, 2012 10:13 am
by Nemesis
I'm not sure that I've ever seen any, and I've never made any myself. I think like most other people I tend to focus on the first hardware version. Revisions are usually just cost cutting measures, and I tend to find them less interesting.
Posted: Wed Dec 12, 2012 10:17 am
by TmEE co.(TM)
The pins of all 3 ports are in a row on all the chips, including MD2 ASIC.
Posted: Wed Jan 09, 2013 7:10 am
by ElBarto
Posted: Wed Jan 09, 2013 12:07 pm
by notaz
I see you have some photos of it, you can crop it from here for another a bit less blurry version:
http://notaz.gp2x.de/img/hw/megadrive_model1.jpg
Posted: Wed Jan 09, 2013 7:28 pm
by Chilly Willy
Your list of pins says
A0-A23 M68K Address Bus
Which is a slight goof - it's A1-A23... there is no A0 on the 68000.
Posted: Thu Jan 10, 2013 12:44 am
by Charles MacDonald
Thanks for the pinouts! This is just what I needed.
Very cool to see the unpopulated modem port on that PCB photo, I guess that's one way to cut costs down.
Posted: Sat Jan 12, 2013 2:04 pm
by Huge
As luck would have it, this chip is one that was photographed by a guy selling photocopies of sega service manuals on ebay.
So, we have an official pinout for this chip.
Pins 69-71 are labeled as test pins on this...
Posted: Sat Jan 12, 2013 7:36 pm
by Charles MacDonald
Ha! What a coincidence -- thanks for pointing this out!