Contents
--------

1. What is LOGIC v1.0
2. Installation
3. Status of the program
4. Distribution status
5. About author


1. What is LOGIC v1.0
---------------------

LOGIC v1.0 is 4-channel PC-based logic analyser program. It uses one
standard LPT port. Default port is LPT1. Other ports (e.g., LPT2 and
LPT3) may be selected, if available, through command line argument as
follows:
          >logic        - for LPT1 (default)
          >logic 1      - for LPT1
          >logic 2      - for LPT2
          >logic 3      - for LPT3


No special interface circuit is needed. TTL compatible logic signal
lines (CH#0 to CH#3) may be connected directly to the LPT port. The
common ground of the logic signal source should be connected to the
LPT port common ground lines. The recommended pin connections are
shown below:

Channel        DB-25 pin no      Name
-------        ------------      ----
CH #0               15           ERROR	
CH #1               13           SELECT
CH #2               12           PAPER EMPTY
CH #3               10           ACKNOWLEDGE
Common           18 to 25        GROUND


One optional post-trigger output line is available for generating a
programmable TTL level stimulus for testing and analysing electro-mechanical
relays and contactors operations timings (e.g., make and break times).
Proper interface/amplifier circuit is necessary to energise the device
under test from this output line. The pin connection of the output line
is given below:

Stimulus                DB-25 pin no      Name
--------                ------------      ----
Post-trigger output          2            DATA 0


Different sampling options are available depending on the type and speed
of the processor. These are tabulated below:

Sampling interval      Recommended processor
-----------------      ---------------------
40 microsec            AT-386 and above
200 microsec           AT-286 and above
1 millisec             any processor
5 millisec             any processor


No of samples to be captured is programmable with a maximum size of
10000 per channel.


Trigger conditions are programmable as shown below:

1. HI level of any channel
2. LO level of any channel
3. Don't care


Pre-trigger data size may be selected as % of total no of samples
from 0% to 100%.


Pre-trigger and post-trigger captured waveforms are displayed in
BW graphics. One optional cursor is available for the study of
timings of the captured waveforms.


2. Installation
---------------

Upon expanding the zip file you will get the following:

1. LOGIC.EXE       - the executable program
2. README.TXT      - this file

You can run the executable program under MS-DOS 3.xx or higher versions.
Don't run it under windows DOS shells. For WIN95, restart the machine
in MS-DOS mode and run it.


3. Status of the program
------------------------

This program is freeware and is freely distributable.
The author will not be responsible for any kind of loss occuring
due to the use of this package.


4. Distribution status
----------------------

This program should not be distributed for commercial purposes.


5. About author
---------------

Name: Anjan Rakshit

e-mail: ar@giascl01.vsnl.net.in
