Yamaha dx100 Owner's Manual page 49

Byte count
Data
Checksum
EOX
The data of 32 voices, including the 24 voices in RAM memory, will be transmitted
if the YES key is pressed in response to the "MIDI Transmit?" display which appears
when the SYS INFO key is pressed twice in the FUNCTION mode. The data for
all 32 voices will also be transmitted when a format no. f=4 dump request is received.
The transmitted data is shown in voice data table 5-1. 55 bytes of 0's are added
to the 73 bytes in this table, so 1-28 bytes are transmitted for each voice. 4096 bytes
are therefore transmitted for all 32 voices. Voices 25 through 32 are transmitted
with initialized voice parameters.
48
0 0 0 0 0 0 0 0 ( 0 0 )
0ddddddd
4096 bytes
0ddddddd
0eeeeeee
11110111(F7)