Repair help

No sound

 * Backup RAM corrupt, SOUND_STOP ($D00046) is non-zero. Clear Backup RAM.

Z80 error
Can be caused by bad components / continuity with the following: Second generation specific (todo: get pin numbers in a nice table)
 * Z80 <-> SM1
 * Z80 <-> RAM
 * Z80 <-> NEO-D0 (NMI,A2-A4,IORQ)
 * Z80 <-> NEO-C1 (Z80 D0-D7)
 * NEO-D0 <-> NEO-C1 (Z80R,Z80W,Z80CLR,SDW)