In Sonic 3

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This message was posted by Cryect, posted on December 16, 2001 at 23:00:13 coming from 128.220.194
This message is a reply to Re: Also how big does the SRAM need to be? posted from John posted at December 16, 2001 at 21:24:47
Sonic 3 is the most complex cartridge I've seen.

IC3 - 74HC74N (a dual D flip flop)
IC4 - 74HC139N (a dual 2 line to 4 line demuxer)
IC5 - 74HC157P (Quadruple 2-line to 1-line data multiplexer)
IC6 - 74HC00P (Quad NAND)

I assume the reason for it being so complex is due to the non-volatile RAM chip being used. There is no battery of course due to it being some type of non-volatile RAM.

Anyways here is the chips used in Shining Force is just a quad NAND chip(HC74HC00) and some unknown Motorola chip with the numbers 355 and 1026B on it.

It appears edge pin B9(A21) run to the NAND chip and so does A8(A13) and I believe CS does also(I haven't desolder the chips to find out for sure and would prefer not to either of course =) My guess it ands all those somehow to determine the CS for the ROM and SRAM.

That misc motorola chip I believe is one of those chips to prevent writes to the SRAM on start up and turn off probably.

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