Fluke Biomedical 945A - Manual (Page 48)

MICRO-
PROCESSOR
6802 / 6808
U15 ADDRESS
DRIVERS
U12, U13
DATA
TRANSCEIVER
U16
CONTROL
SIGNAL
BUFFER
U18
8 Hz NMI
CLOCK
U30, U31, U32
RESET
CIRCUIT
R/W
EXTERNAL
BUS DATA
TRANSCEIVER
U73
CE
EXTERNAL BUS
CONTROL LINE
DRIVER U74
SPARE DECODED ADDRESS 4040, 60, 80-E0
J
3
E
X
TE
RNAL BUS
CONNE
CTOR (TO OP
TION
BOARDS
)
CONTROL
SIGNAL
BUS RAM 0000-1FFF
U21
RAM 2000-3FFF
U22
(OPTIONAL)
PROM
8000-FFFF
U23
CE
CE
WRITE CYCLE
CLOCK, 1 MHz
U19
MASTER
DECODER
U14
RAM ENABLE
U17
MAJOR
FUNCTION
DECODER
U1 BARGRAPH
REGISTER
SELECT
ADDRESS
BUS
DATA
BUS
IRQ
RESET
NMI
Figure 4-2. Page 1 of 3. Block Diagram - Main Circuit Board
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