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A number of processors on the CPU assembly allow the analyzer to interface with the outside
world. he front panel processor handles inputs from the front panel keyboard and RPG.
he super I/O processor is used to provide the following interfaces:
Floppy disk controller
he
DIN keyboard interface
he
useful when writing programs with IBASIC.
Centronics interface
he
interface.
RS-232 interface
he
interface.
LAN interface
he
to a server. he LAN interface will not function unless you have Option 1F7.
he HP-IB interface allows the analyzer to be a system controller or talker/listener on an HP-IB
bus. In addition, there are two
accessed. here is also an external trigger input for sweep control.
he rmware for the analyzer is stored in two places. A bootROM contains low-level rmware
that allows the analyzer to run some power-on self-tests, and perform functions such as loading
rmware from a disk. he main rmware, which includes the analyzer's operating system and
additional self-tests, is stored in segmented EPROMs, along with the correction constant data
for the instrument. Both the bootROM and the main EPROMs are
ash EPROMs. hey can be
erased and reprogrammed without removing the CPU assembly from the analyzer. Because
the main EPROMs are segmented, upgrading rmware or correction constants can be done
independently.
he non-volatile SRAM is used to store instrument-state and peripheral-state settings. It is
also used as a RAM disk by the save/recall functions, which refer to the non-volatile SRAM as
\NON-VOL RAM DISK." his non-volatile SRAM is powered by a +12 V to +13 V supply when
the analyzer is in standby, and by a battery when the AC power is disconnected.
he CPU assembly also contains SIMM DRAM. his SIMM DRAM is used for volatile storage of
data and for use by IBASIC programs. he CPU board only accepts one SIMM (8 MB of SIMM
memory is installed at the factory).
A7 Display Assembly
he A7 display includes a monochrome 20.8-cm (9-inch) CR and a matching driver board.
Video signals are produced by the A2 CPU assembly and sent to the A7 assembly for display on
the CR . An intensity adjustment is accessible from the front panel. his is a VGA compatible
display with a horizontal scan rate of 31.41 kHz.
A8 3.5" Internal Disk Drive Assembly
he A8 3.5" internal disk drive is referred to by the analyzer as the internal disk. It accepts
double density or high density 3.5-inch disks. It can read from either LIF or DOS format disks,
but can only write to DOS disks. he analyzer can only format disks in DOS format (the LIF
format is not supported).
controls the 3.5" internal disk drive.
allows you to connect an external keyboard, which is very
allows the analyzer to control printers and plotters with a parallel
allows the analyzer to control printers and plotters with a serial
allows a network interconnect for networking test stations (instruments)
L outputs (user bit and limit test pass/fail bit) that can be
Theory of Operat on
6-3
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