HP 9020 - Computer Block Diagram

2-2 Theory of Operation
PRINTER
PRINTHEAD
INTERCONNECT
MOTOR
BOARD
DRIVE
POWER SUPPLY
BOARD
AND ACMODULE
PRINTHEAD
1
ACMODULE
AND MOTOR
PRIMARY BOARD
PAPER
LOGIC
SECONDARY BOARD
SENSOR
BOARD
BOARD
SUPERVISOR BOARD
f--
1/0 BACKPLANE
r
~ j4110Sl0TS'
PROCESSOR STACK
MOTHERBOARD
DISPLAY
CPU FINSTRATE
lOP FINSTRATE
lOP BUS
FJAM BOARDS
C-j
3 MASS STORAGE
~ CONTROLLER SLOTS
--
I
BOOTSTRAP LOADER
2
I
KEYBOARD
CONTROLLER I CONTROLLER I
ELECTRONICS
BOARD
I
KEYSWITCH
1 AVAILABLE 1/0 CARDS:
BOARD
HP-IB
GPIO
KEYBOARD
.-
PSI
ASI (RS232)
9130K WINCHESTER
MUX
FLEXIBLE FIXED
SRM
DISC
DISC
RJE
DRIVE DRIVE
RGB VIDEO
2 BOOTSTRAP LOADER CARD
MASS STORAGE
USED IF NO WINCHESTER FIXED
DISC DRIVE.
Figure 2-1. Computer Block Diagram