Yamaha FB-01 Service Manual page 6

■ FB-Ol MEMORY MAP & I/O PORT MAP
MAIN MEMORY MAP
FFFFHI
C000HL
64kbits X 2
(16kbyte) S RAM
4000H
256kbits
FB-01
ROM AREA
32kbytes
I/O AREA MAP
FFH
40H
30H
20H
10H
LCD I/O
Panel SWITCH
USART I/O
OPP I/O
OPP I/O MAP
01H
00H
CPU READ
CPU WRITE
STATUS DATA
Register
Address
USART I/O MAP
1 1H
1 OH
CPU READ CPU WRITE
STATUS
I
Control Word
DATA
1
DATA
Panel SWITCH I/O MAP
9nM|x>e|Dl|D2|E3|I>4|D5|i>6|P7[ ~
3 1H
30H
LCD I/O MAP
CPU READ CPU WRITE
DATA DATA
•
Busy Flag
Adrs counter
Instruction
Register
BIT Switch Name
D7 +1 /Yes
D6 -1/ No
D5 Voice Select
D4
Voice Function
D3
Inst Function
D2
Inst Assign
D 1 Inst Select
DO
System set up