SX-240 EPROM 16-bit checksums:

Assuming 27C256 used, with code starting at 4000h 
and addresses from 0-3FFFh all FF's

Master: 8AD9h   (EPROM near left edge if SX-240)
Slave: C2DCh   (the other EPROM)

New Slave EPROM is only required for saving patches
or sequences via sysex.  All other new features are 
implemented in the master code.


