Yamaha PortaSound PSS-795 Owner's Manual page 47

Owner's Manual
Appendix: Bulk Data Format
In addition to an explanation on page 39, in this section you have detailed information about the Bulk Data Format for the
PortaSound.
HEADER and EOX
0000H
Status=FOH
Manufactuerer ID=43H (Yamaha)
Classification ID=76H (Portable Keyboard)
Data Format Number=07H (PSS-795)
(See next page.)
Check Sum Data=Two's compliment of 7 bits sum of all Songs
EOX=F7H