NEO-I0

MVS specific chip that does a bunch of unrelated things.


 * S ROM address latch for SFIX, same as S ROM portion of NEO-273
 * SM1 /CS output when Z80 is reading from ROM and SM1/SFIX is enabled (SM1CS = SDROM OR SYSTEM)
 * /ROMOE output for PROG board (ROMOE = ROMOEU AND ROMEOU)
 * Video sync output for JAMMA edge
 * Coin counter and coin lockout output