1 thought on “Roland YAMAHA Checksum Calculator”

  1. lua function to calculate checksum from MemoryBlock()

    function checkSumMb(m) -- Roland Checksum from MemoryBlock
      local sum=0
      local result=0
      for i=0,m:getSize()-1 do
        sum=sum+m:getByte(i)
      end
    local result=bit.band(sum,0x7f)
    if result * 1 ~=0 then
    result= 0x80-result
    end
    return result
    end --function

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