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-
- The 8 Channel Logic Analyser, (AmigaScope).
- -------------------------------------------
-
- General Information:-
- ---------------------
-
- 1) For the general operation of the analyser refer to the ~AmigaScope.doc~
- file. This is an EXACT copy of the ~AmigaScope.hlp~ file in the
- archive in the ~AmigaScope~ drawer.
- 2) This is the copyright ~(C)1990 Stephen L Childress~ and is subject to
- HIS terms and conditions.
- 3) It is NOT for profitable use at all.
- 4) Ensure that ALL of the STANDARD libraries, devices, handlers, fonts and
- commands are in their correct drawers.
- 5) Ensure that ~More~, ~Display~ and ~LHA~ are in the computers' path.
-
- ----------------------------------------------------------------------------
-
- Specifications, (based on a Standard A500 and WorkBench 1.3x):-
- ---------------------------------------------------------------
-
- (This was originally designed for an A1000 with 1.5MB memory.)
-
- 1) Number Of Simultaneous Channels... 8 Channels, TTL level only.
- 2) Input Resistance On Each Channel.. Better than 1 KilOhm.
- 3) Worst Case Aquisition Time........ 20uS/Sample. It is capable of much
- faster access times with faster
- CPUs and newer AMIGA models.
- 4) Clock............................. Internal only, software controlled.
- 5) Triggering........................ One 8 bit Byte only, refer to the
- ~AmigaScope.doc~ file.
- 6) External Trigger.................. No.
- 7) Memory............................ Controlled by software.
- 8) Save Memory Contents.............. Yes.
- 9) Compare And Search Facility....... No.
- 10) Display Mode...................... Graphical only.
- 11) Outputs........................... None.
- 12) Print Facility.................... Yes, use with EXTREME caution.
- Refer to the ~AmigaScope.doc~ file.
- 13) Maximum Input Voltage............. + or - 15 Volts accross 470 Ohms,
- clamped to the + 5 Volt rail or
- Ground via the clamp diodes.
- 14) Maximum Input Voltage Time........ NOT more than 10 seconds.
-
- ----------------------------------------------------------------------------
-
- Construction Of The Unit:-
- --------------------------
-
- 1) There are NO drawings for the mechanical construction as the circuit
- is self explanatory. The circuit is NOT for the A1000 as the parallel
- port wiring is different. You will have to modify the circuit as
- required to suit the A1000 parallel port.
- 2) The device is built up onto a length of copper stripboard.
- 3) The copper strips are cut in the appropriate positions for the
- resistors and diodes to be fitted.
- 4) The resistors and diodes are mounted on the NONE print side of the
- board.
- 5) The capacitors are wired in parallel with the resistors on the
- PRINT side of the board.
- 6) The 25 way ~D~ type plug is wired to one set of resistors.
- 7) The input lines are wired to the other set of resistors and Crocodile
- Clips fitted.
- 8) The unit is then fitted into a box of your choice, doing any necessary
- drilling and cutting as required.
- 9) Thoroughly CHECK and RECHECK your construction work.
- 10) The device is now ready for use.
-
- ----------------------------------------------------------------------------
-
- Testing The Hardware:-
- ----------------------
-
- 1) Ensure that the AMIGA is switched OFF.
- 2) Connect the hardware to the parallel port.
- 3) Switch ON the AMIGA and boot up into a standard Workbench screen.
- 4) From the correct drawer start up the ~AmigaScope~ software.
- 5) An NTSC screen will appear in 640x400x4 colours.
- 6) When using a standard TV or PAL/NTSC type monitor the display suffers
- from the usual ~Hires~ flicker. This is a small price to pay for such
- a useful piece of software.
- 7) To use the software refer to the ~AmigaScope.doc~ file.
- 8) Read the ~Warning~ file.
- 9) The colour coding of the INPUT lines are as folows:-
- A) White..................... Data Line 0.
- B) Yellow.................... Data Line 1.
- C) Cyan...................... Data Line 2.
- D) Green..................... Data Line 3.
- E) Magenta................... Data Line 4.
- F) Red....................... Data Line 5.
- G) Blue...................... Data Line 6.
- H) Orange.................... Data Line 7.
- I) Black..................... Common Ground.
- 10) Connect the coloured ~Crocodile Clips~ to the Black ~Crocodile Clip~.
- 11) Refering to the ~AmigaScope.doc~ start the data access.
- 12) Check that ALL of the data line traces are at logic 0. If any are NOT
- at logic 0 then switch OFF the AMIGA, disconnect the hardware, RECHECK
- ALL of the construction work and go back to 1).
- 13) If ALL lines are OK then disconnect the coloured ~Crocodile Clips~
- from the Black ~Crocodile Clip~ and reconnect them to the + 5 Volt
- rail.
- 14) Check that ALL of the data line traces are at logic 1. If any are NOT
- at logic 1 then switch OFF the AMIGA, disconnect the hardware, RECHECK
- ALL of the construction work and go back to 1).
- 15) If ALL lines are OK then disconnect the coloured ~Crocodile Clips~.
- 16) Switch OFF the AMIGA and disconnect the hardware.
-
- ----------------------------------------------------------------------------
-
- Using The 8 Channel Logic Analyser:-
- ------------------------------------
-
- 1) Ensure that the AMIGA is switched OFF.
- 2) Connect the hardware to the parallel port.
- 3) Switch ON the AMIGA and boot up into a standard Workbench screen.
- 4) From the correct drawer start up the ~AmigaScope~ software.
- 5) An NTSC screen will appear in 640x400x4 colours.
- 6) When using a standard TV or PAL/NTSC type monitor the display suffers
- from the usual ~Hires~ flicker. This is a small price to pay for such
- a useful piece of software.
- 7) To use the software refer to the ~AmigaScope.doc~ file.
- 8) Read the ~Warning~ file.
- 9) The colour coding of the INPUT lines are as folows:-
- A) White..................... Data line 0.
- B) Yellow.................... Data line 1.
- C) Cyan...................... Data line 2.
- D) Green..................... Data line 3.
- E) Magenta................... Data line 4.
- F) Red....................... Data line 5.
- G) Blue...................... Data line 6.
- H) Orange.................... Data line 7.
- I) Black..................... Common Ground.
- 10) Connect up the required lines to unit under test.
- 11) Refering to the ~AmigaScope.doc~ start the data access.
- 12) When you have finished disconnect the ~Crocodile Clips~ and switch
- OFF the AMIGA.
- 13) Disconnect the hardware.
-
- ----------------------------------------------------------------------------
-
- Further Information:-
- ---------------------
-
- 1) The circuit is bi-directional. That is, it can be used as a data INPUT
- board OR a data OUTPUT board, using the resistors as buffer/limiting
- resistors.
- 2) The parallel capacitors accross the resistors serve two purposes:-
- A) As speed up capacitors to counteract the shunt effect of the
- parallel port, on the parallel port side.
- B) To neutralise the effect of the clamp diodes capacitance at half
- the supply rail, that is + 2.5 Volts. The estimated peak total
- capacitance of the two clamp diodes on EACH channel is about 50pF
- hence the 47pF value. The reactance of the capacitors is about
- 470 Ohms at the CPU clock frequency of a standard AMIGA A500.
- 3) No power is taken from the parallel port + 5 Volt rail.
-
- ============================================================================
-
- Mr Barry Walker,
- 70 King George Road,
- Loughborough,
- Leicestershire,
- LE11 2PA,
- England.
-
- Email to:-
-
- wisecracker@tesco.net
-
- BYE.....
-
- ============================================================================
-