Appendix C Sys-Ex Implementations; S6 Sys-Ex - Alesis QS Series Service Manual

8.00 Appendix C Sys-Ex Implementations

8.10 S6 Sys-Ex

SYSTEM EXCLUSIVE FORMAT
The QS6 MIDI System Exclusive message format is as follows:
OPCODES:
00-MIDI User Program Dump F0 00 00 0E 0E 00 <program#> <data> F7
<program#>= 0..127 selects individual user programs
<data> is in a packed format in order to optimize data transfer. Eight MIDI bytes are used
to transmit each block of 7 QS6 data bytes. If the 7 data bytes are looked at as one 56-bit
word, the format for transmission is eight 7-bit words beginning with the most significant
bit of the first byte, as follows:
There are 400 data bytes sent for a single program dump, which corresponds to 350
bytes of program data. With the header, the total number of bytes transmitted with a
Alesis QS Series Keyboards Service Manual V1.00
4/15/95
F0
00 00 0E
0E
cc
dd
:
:
F7
SEVEN QS BYTES:
0: A7 A6 A5
1: B7 B6 B5
2: C7 C6 C5
3: D7 D6 D5
4: E7 E6 E5
5: F7 F6 F5
6: G7 G6 G5
TRANSMITTED AS
0: 0 A6 A5
1: 0 B5 B4
2: 0 C4 C3
3: 0 D3 D2
4: 0 E2 E1
5: 0 F1 F0
6: 0 G0 F7
7: 0 G7 G6
System exclusive status
Alesis manufacturer id#
QS id#
Opcode
Data
:
:
End-Of-Exclusive
A4 A3 A2
B4 B3 B2
C4 C3 C2
D4 D3 D2
E4 E3 E2
F4 F3 F2
G4 G3 G2
A4 A3 A2 A1
B3 B2 B1 B0
C2 C1 C0 B7
D1 D0 C7 C6
E0 D7 D6 D5
E7 E6 E5 E4
F6 F5 F4 F3
G5 G4 G3 G2
42
A1 A0
B1 B0
C1 C0
D1 D0
E1 E0
F1 F0
G1 G0
A0
A7
B6
C5
D4
E3
F2
G1
11/19/06