M6759; Ba7660Fs - NAD T 752 Service Manual

M6759

KEYBOARD: U201 & U202
P0.7:0
Port 0
Drivers
Data Bus
Program Address
Register
64K bytes
MTP Memory
Program Counter
Incrementer

BA7660FS

COMPONENT VIDEO BOARD: U4301
P2.7:0
Port 2
Drivers
Port Latch
Buffer
DPTR
MUTE
1
INA
2
GND
3
INB
4
GND
5
N.C.
6
INC
7
GND
8
P1.7:0
Port 1
Drivers
Port Latch
Interrupt Logic
Data Bus
ACC
ALU REG1
PSW
Data Bus
512 Bytes RAM Addr.
RAM
OSC
16
15
6dB 75W
14
13
6dB 75W
12
11
6dB 75W
10
9
42
P3.7:0
Port 3
Drivers
Serial Port
Timer
Port Latch
B Register
ALU REG2
Stack
Pointer
ALU
Instruction
Register Register
Clocks and
Control
V
CC
OUTA1
OUTA2
OUTB1
OUTB2
N.C.
OUTC1
OUTC2