Yamaha VL70-m User Manual

106

After converting all 48 rows in the example we
have the following hexadecimal bytes:

Checksum

Some VL70-m system exclusive message
require a “checksum” — a data byte which is

used to check for errors during MIDI data transfer.
The checksum is calculated using the system
exclusive message start address and data (data
size). A method of calculating the checksum is
given below, using a simple data format as an
example.

1. Convert the hexadecimal start address and

data bytes (underlined in the example) to
decimal format using the chart below. Each
two-digit hexadecimal byte becomes a
decimal number.

•

“mm”, the Model ID, is “57” when the VOICE
sound module mode is selected, and “4C” when
the VL-XG sound module mode is selected.

5. Plug the data derived from the bitmap design

into the “xx xx .... xx xx” portion of the
bitmap window data format, and you have
the data stream required to display the
design on the VL70-m display.

FO 43 0n mm ss ss ss xx xx •• xx xx CS F7

Checksum

Data (size)

Model ID

Start address

Device number.

HEX DEC

Appendix

01 0E 30 40 00 01 07 09 13 22 43 23 13 09 07 01
70 0C 03 00 00 70 7C 72 79 48 48 48 79 72 7C 70
00 00 00 40 20 00 00 00 00 40 20 40 00 00 00 00