To dump the patches on a Yamaha DX-100:
Ensure “sys info” is on by pressing function + 5
The DX100 cannot, as far as I know, bulk send all patches. Instead, when sys info is on, it always does a 101 byte sysex dump of the newly selected patch on each patch change.
To dump your patches:
1. start your sysexec recording recording
2. Select patch 1 (you should see 101 bytes received by your sysexec recorder
3. Select patch 2, etc.
To transfer the patches, you play back the sysex file and the DX100 will automatically receive the patches.