Korg Poly-800II Service Manual page 13

4. TAPE FORMAT
(a) Overall Composition
Leader
section
i i
ID
Section
Data Section
ii i
Check Sum
Section
Leader
Section
i
approx. 2.5 sec. 2 messages
2688 message 1 message apporox. 0.5 sec.
(b) Composition of 1 message in Leader Section
0
1 1 1 1
1 1 1 1 1 1
I I
Start bit
mark
(c) Composition of ID section
1 message
1 message
I
0
I
DO
|LS8
D1 D2
D3
D4 D5 D6 D7
MSB |
1
|
1
|
I
DO
I II»
D1 D2 D3 D4 D5 D6 D7
MSB |
1
|
1
Start bit ID data-1st Byte
ID data-1st byte-42H (KORG's MIDI ID code)
ID data-2nd byte-OH (Poly-800ll's MIDI ID code)
mark Start bit
ID data-2nd Byte
mark
(d) Composition of 1 message in Data Section and Check Sum Section
0
I
DO
|lsb
D1 D2
D3
D4
05 D6 D7
MSB |
1
|
1
Start bit Data bit mark
Data moves in order from LSB, with one "0" inserted
before 8 data bits as the start bit.
Check sum uses 8 bit calculation, without regard to
decimal point.