NEO-I0



MVS specific chip that does a bunch of unrelated things.


 * S ROM 16bit address latch for SFIX, same as S ROM portion of NEO-273
 * SM1 /CS output when Z80 is reading from ROM and onboard ROMs are enabled
 * /ROMOE output for cartridge(s) PROG board
 * Video sync inversion (or not) to JAMMA edge
 * Coin counter and coin lockout output

Why is A3 needed ?

=Pinout=