SysEx Checksum

I all,

I would like to find a way to get the correct value for the checksum 3e in this example

F0 50 2C 04 00 11 00 10 20 00 00 01 xx xx 00 SUM F7

the checksum is the summation between (  ) so the sum of 14 bytes before the SUM starting at 50.

xx xx are 8 bit data

F0 ( 50 2C 04 00 11 00 10 20 00 00 01 00 00 00 ) 3e F7

50 + 2C + 04 + 00 + 11 + 00 + 10 + 20 + 00 + 00 + 01 + 00 + 00 + 00 =. 3E

If I use external 8-bit checksum calculator it works perfectly but I can’t find a way in CTRLR, any idea ?

In CTRLR The Zy calculation seems not to be the right solution because I need to include the 12 bytes before the calculation and if I use y with greater value than 9 the result is always 0.

Regards

 

 

Roland JD-990 Sysex Dump Utility

Roland JD-990 Sysex Dump Utility

 

    • Downloads Internal Patches I-11 – I-88 (64 x patches).
    • Can upload sysex files back to the JD-990.
    • Features progress bar and cancel button.
    • Transfer times can be changed (recommended 360~400ms download and ~150ms upload according to my tests but that may depend on your setup).
    • A full dump should be 33216 bytes.  If you get a “MIDI Buffer Full” notice on the JD-990, increase the Transfer Rate.
    • Tested in standalone mode only with  [Ctrlr 5.3.201 (Recommended)] ::  Windows 10.
    • This program will be eventually included in the JD-990 Super Editor.

Version History and Change-log:

  • Version 1.4 (09/28/2018) Minor Code & Interface updates.
  • Version 1.3 (09/25/2018) Fixed popup dialogue potentially showing on panel load.
  • Version 1.2 (08/19/2018) Fixed panel size (24px Ctrlr Bug)
  • Version 1.1 (07/09/2018) Changed checksum function; minor interface updates
  • Version 1.0 (07/06/2018)
Download 70.1 KB

Downloads = 175

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