Microprocessor
Circuit
2212 Service Manual
Long Record Option
(Option
1M)
The
features of the 2212 Option 1M are:
- Extended
and
programmable recordlength: 4K,
8K,
16K,
32K,
64K or 128K.
- More flexible programmable trigger positioning: 0-100%.
- Extended software features : Fit To Screen magnifier, Time Positioning.
In
a 2212 Option 1M, the Processor board A15 is replaced by a Processor board
A20. The front panel overlay has also been modified. Some of the 2212 func-
tions have been changed and/or new features are added.
A 2212 Option 1M instrument can be recognized by
the
"CURSORfflME" text
above the
upper
right side area and the "FIT TO SCREEN" magnifier setting
in
the
horizontal section (see also the 2212 Option 1M User Manual).
The
specific
Option
1M
circuit
diagrams are
numbered
16A, 16B, 17, 18, 19,
20
and
21
in
combination
with
the
text
"Option
1M". These diagrams are
printed
in
this
manual
in
the
Diagram section, following
the
diagrams of
the
standard
2212.
Changes that have been made compared to the standard version of the 2212, are:
-
The
68070 microprocessor is running at 34.575 MHz, instead of
the
29.4912 MHz used
in
the standard version. A separate clock
IC
(U1841) now
generates a 4.9152 MHz clock signal needed for
the
internal UART and the
display system.
- Two Pseudo Static RAM's of 512K x 8 each are added to the system memory
(U1808 and 1809) to provide sufficient memory for 128K waveforms.
The
refresh requirements of these RAM's are guaranteed
by
continuously
transferring waveform DMA data to the display system. This is also done
when
the oscilloscope is
in
the non-store
mode
(see
the
Display System
explanation).
-
The
input
latch U1830 on A15, is replaced
by
two
input
multiplexers U1830
and
U1831,
which
provide additional
inputs
for monitoring the status of the
digital acquisition system.
NOTE
The firmware
of
the standard 2212 board (A15)
and
the option
1M
board (A20) are
not
compatible in
any
way,
and
have
therefore
different Tektronix partnumbers.
Revised 3/93
3-
41
To Next Page
Loading...
Need help?
General
