Modifications for the Yaesu FT-736 Part 1
Mods for FT736R VHF


Modification of the PMS on the FT736R for VHF.
Extended coverage on receive from the front panel can be achieved by means of a few simple but repetitive actions,
The receive can be extended from about 139 MHz to around 155 MHz By the use of the Repeater shift,
This gives a coverage of about 16 MHz,
There is no need to snip any of the components,
And you will not need a soldering Iron for this Modification,

Instructions


There are Two Mods for the FT736R for VHF, One is for the European Version, Which is the one that we will deal with first, And the other is for the American Version, That we will deal with later on.

Important notice


Make sure that you are in VFO B when you start this Mod Follow the instructions to the letter. Always put the Highest Frequency into VFO B, and the Lowest ones into VFO A.

  1. Turn on Your RIG.
  2. Put the RIG into Repeater shift for the 144 MHz Band, By Pressing the - RPT KEY.
  3. Set the OFFSET to 01.999.9.
  4. Tune the RIG to the Highest Band Edge of 145.999.9 MHz
  5. Press the REV KEY ( KEY 5 ).
  6. Press the DOWN MHZ Button.

    You should now have 146.999.9 MHz on your Digital Readout.

  7. Repeat Steps 5 & 6 again.

    You should now have 147.999.9 MHz on your Digital Readout.

  8. Increase the OFFSET to 03.999.9.
  9. Repeat Steps 5 & 6 Twice more, Alternating between both until you get 149.999.9 MHz, On you Digital Readout.
  10. Increase the OFFSET to 05.999.9.
  11. Repeat Steps 5 & 6 Twice more, Alternating between both until you get 151.999.9 MHz, On your Digital Readout.

Keep on Increasing the OFFSET by 2 until you get the OFFSET up to 99.999.9,
And at the same time keep on Repeating Steps 5 & 6 Twice after every Increase in the OFFSET, until you get the Frequency up to 245.999.9 MHz

For the American Version Only.


some of these moves are the same. but you can do the European Version on an American RIG. Though you can not do the American Version on an European RIG.

Instructions


Make sure that you put the Highest Frequency into VFO B, and the Lowest Frequency into VFO A.

  1. Turn on your RIG.
  2. Put the Rig into Repeater shift for the 144 MHz Band, By pressing the - RPT KEY ( KEY 5 ).
  3. Set the OFFSET to 03.999.9.
  4. Tune the RIG to the Highest Band edge, of 147.999.9 MHz.
  5. Press the REV KEY ( KEY 5 ).
  6. Press the DOWN MHZ Button.

    You Should now see 148.999.9 MHz on your Digital Readout.

  7. Repeat Steps 5 & 6 Three times more, Alternating between both until you see 151.999.9 MHz on your Digital Readout.
  8. Increase the OFFSET to 07.999.9.
  9. Repeat Steps 5 & 6 Four time more, Alternating between both until you see 155.999.9 MHz on your Digital Readout.
  10. Increase the OFFSET to 11.999.9.
  11. Repeat Steps 5 & 6 Four Times more, Alternating between both until you see 159.999.9 MHz

Keep on Increasing the OFFSET by 4, until you get the OFFSET to 99.999.9. And at the same time Keep on Repeating Steps 5 & 6
Four times more after every Increase in the OFFSET until you get the Frequency to 245.999.9 MHz.
STAGE 2


Now that you have 245.999.9 MHz in VFO B, And 144.000.0 MHz in VFO A, We come to the next move, Which is this,
Press the Function key which is marked with an (F),
Followed by the PMS KEY ( KEY 3 ),
This stores the New Band edges in the PMS,
Now Press the PMS key again,
This time Tune to the Highest Frequency in the PMS,
Which should now be 245.999.9 MHz.

Make sure you have 245.999.9 MHz in VFO B,
Make sure that the Frequency in VFO A is Lower than the Frequency in VFO B.
Make sure that the Repeater shift is set to - RPT.
Make sure that the OFFSET is set to 99.999.9.

  1. Press the REV KEY ( KEY 5 ).
  2. Press the DOWN MHz Button.
  3. Now Repeat Steps 1 & 2, Alternating Between both until you get the Frequency to 345.999.9 MHz in the PMS.
  4. Now Press the Following Keys( Key 9,Key 2,Key 4,Key 9 again) in that order.

    The Magic Number is 9,2,4,9.

  5. Press the F KEY followed by the PMS KEY. This stores the New band edges back in the PMS.
  6. Press the PMS KEY again, Now Tune to the Highest Frequency in the PMS, Which should be 345.999.9 MHz.
  7. Repeat Steps 1 and 2 Alternating Between both until you get the Frequency up to 445.999.9 MHz.
  8. Repeat the Magic Number of 9,2,4,9.
  9. Repeat Step 5.
  10. Repeat Step 6.
    And Tune to the Highest Frequency in the PMS, Which should be 445.999.9 MHz.
  11. 11/ Repeat Steps 1 and 2 Alternating Between both until you get the Frequency to 545.999.9 MHz.
  12. Repeat the Magic Number of 9,2,4,9 in that order.
  13. Repeat Step 5.
  14. Repeat Step 6,
    And Tune to the Highest Frequency in the PMS, Which should be 545.999.9 MHz.
  15. Repeat Steps 1 and 2 Alternating between both until you get the Frequency up to 645.999.9 MHz.
  16. Repeat the Magic Number 9,2,4,9.
  17. Repeat Step 5.
  18. Repeat Step 6,
    And Tune to the Highest Frequency in the PMS, Which should be 645.999.9 MHz.
  19. Repeat Steps 1 and 2 Alternating Between Both until you get the Frequency up to 745.999.9 MHz.
  20. Repeat the Magic number of 9,2,4,9.
  21. Repeat Step 5.
  22. Repeat Step 6,
    And Tune to the Highest Frequency in the PMS, Which should be 745.999.9 MHz.
  23. Repeat Steps 1 and 2 Alternating Between both until you get the Frequency up to 845.999.9 MHz.
  24. Repeat the Magic Number of 9,2,4,9 in that order
  25. Repeat Step 5.
  26. Repeat Step 6, And Tune to the Highest Frequency in the PMS, Which should be 845.999.9 MHz.
  27. Repeat Steps 1 and 2 Alternating Between Both until you get the Frequency up to 945.999.9 MHz.
  28. Repeat the Magic Number of 9,2,4,9 in that order.
  29. Repeat Step 5.
  30. Repeat Step 6,
    And Tune to the Highest Frequency in the PMS, Which should be 945.999.9 MHz.
  31. Repeat Steps 1 and 2 Alternating Between Both until you get the Frequency up to 999.999.9 MHz, Be careful not to go Passed 999.999.9 MHz, Because the Rig automatically Default back to 945.999.9 MHz, And you will have to start again from that point.
  32. Repeat the Magic Number of 9,2,4,9.
  33. Repeat Step 5.
  34. Repeat Step 6,
    Now slowly Tune Across the Two Band Edges, Until you see 00.000.0 MHz,
  35. Now Whilst still in the PMS Press the VFO A Button.
  36. Repeat the Magic Number of 9,2,4,9.
  37. Repeat Step 5.
  38. Repeat Step 6,
    Now Press either of the UP or DOWN scan Buttons, and you will find that the RIG will scan between 00.000.0 MHz to 999.999.9 MHz, or 999.999.9 MHz to 00.000.0 MHz.

    Now that you have set your RIG scanning UP and DOWN, you will find a number of signals on the Band.
    However you will hear signals up and down the Band that are not there.
    This can be checked out with a scanner, A signal Generator and a Digital Frequency Meter, But if you do not have these, do not worry Because you do not need them, simply put 138.000.0 MHz in to VFO A, And 156,999,9 MHz in to VFO B.

  39. Repeat the Magic Number of 9,2,4,9 in that Order.
  40. Repeat Step 5.
  41. Repeat Step 6.
You have completed this Modification.
Mods for FT736R UHF


BY G0HEG
Modification of the PMS on the FT736R for the 430 MHz Band, Extended coverage on receive from the front panel can be achieved by means of a few simple but repetitive actions, The receive can be extended from about 425 MHz to around 459 MHz. by the use of the Repeater shift.

This gives a coverage of about 34 MHz, There is no need to snip any of the components, And you will not need a soldering Iron for this Modification.

Instructions


Make sure that when you start this Mod that you are in VFO A.
Make sure that you put the Highest Frequency in to VFO B,
and the Lowest one in to VFO A.
Be careful not to Touch the UP or Down Scan Buttons on your RIG Whilst doing these Mods.
Be careful not to Touch the Main Tuning knob on your RIG Whilst doing these Mods

Please Note Also,
Do not Press any scan Buttons on you FT736R,
Do not Press the Channel Buttons or the Tuning Knob,
Because if you Do Turn the Channel Knob the wrong way,
you will lose all that you have done so far,
What happens is this ( Press the wrong way the RIG will default back to 430 MHz.
Turned the wrong way it will Default Back to 430 MHz
Only Press or Turn Those Knobs Buttons or keys specified in these Mods.

  1. Turn on your RIG.
  2. Put the RIG into Repeater Shift for the 430 MHz Band, By pressing the + RPT KEY.
  3. Set the OFFSET to 09.999.9.
  4. Tune the RIG to the Lowest Band edge of 430.000.0 MHz.
  5. Press the REV KEY ( KEY 5 ).
  6. Press the UP MHz Button.
  7. Repeat Steps 5 & 6 Nine Times more, Alternating Between Both until you get the Frequency down to 420.000.0 MHz.
  8. Increase the OFFSET to 19.999.9.
  9. Repeat Steps 5 & 6 Ten Times, Alternating Between both until you get the Frequency down to 410.000.0 MHz.
  10. Increase the OFFSET to 29.999.9.
  11. Repeat Steps 5 & 6 Ten Times, until you get down to 400.000.0 MHz.
  12. Increase the OFFSET to 39.999.9.
  13. Repeat Steps 5 & 6 Ten Times, until you get down to 390.000.0 MHz.
  14. Keep on Increasing the OFFSET by Ten, and after every Increase in the OFFSET, Repeat Steps 5 & 6 Ten Times, Until you get the OFFSET to 99.999.9, And the Digital Read out to 330.000.0 MHz.
STAGE 2


Now that you have got so far it is Important that you follow the next few moves to the letter.

  1. Press the Function Key Which is Marked with an ( F )
  2. Press the PMS KEY ( KEY 3 ).

    You have just stored your New Band Edges in to the PMS,
    to check this out simply Press the PMS KEY,
    and Press either of the up or down Scan Buttons,
    you will find that the RIG will scan up or down either way,
    but that Depends on which Button was Pressed first.
    Now that you have 330.000.0 MHz in the PMS,
    Make sure that you have an OFFSET of 99.999.9. in the PMS, also Make sure that the Repeater Shift is in the + RPT position.
  3. Tune to the Lowest Frequency in the PMS which should Now be 330.000.0 MHz.
  4. Press the REV KEY ( KEY 5 ).
  5. Press the UP MHz Button.
  6. Repeat Steps 5 & 6 Alternating Between both until you get your Digital Readout Down to 230.000.0 MHz.
  7. Press the Magic Number of 9,2,4,9 in that order.
  8. Press the F Key followed by the PMS key.
  9. Press the PMS Key again, Now tune to the lowest Frequency in the PMS Which should now be 230.000.0 MHz.
  10. Repeat Steps 5 & 6 Alternating Between both until you get the Frequency Down to 130.000.0 MHz
  11. Press the Magic Number of 9,2,4,9 in that order.
  12. Press the F Key followed by the PMS Key.
  13. Press the PMS KEY again, And Tune to the Lowest Frequency in the PMS,
  14. Repeat Steps 5 & 6 Alternating until you get the Frequency down to 30.000.0 MHz.
  15. Press the Magic Number of 9,2,4,9, in that order.
  16. Press the F KEY followed by the PMS Key.
  17. Press the PMS Key, Now Tune to the lowest Frequency in the PMS which should now be 30.000.0 MHz
  18. Repeat Steps 5 & 6 Alternating Between both until you get the Frequency down to 00.000.0 MHz, Be careful not to go Passed this Frequency, Because the RIG will automatically Default Back to 30.000.0 MHz, And you will have to start again from that point.
  19. Press the Magic Number of 9,2,4,9, in that order.
  20. Press the F Key followed by the PMS Key.

Modification af the PMS on the FT-736R for The 1296 MHz Band


BY G0HEG


Modification of the PMS on the FT736R for 1296 MHz, Extended coverage on receive from the front panel can be achieved by means of a few simple but repetitive actions, The receive can be extended from about 1215 MHz to about 1326 MHz, by the use of the Repeater shift, This gives a coverage of about 111 MHz.
There is no need to snip any of the components, and you will not need a soldering Iron for this modification.

INSTRUCTIONS


Make sure that you put the Highest Frequency into VFO B,
Make sure that you put the Lowest Frequency into VFO A.
  1. Turn on your RIG.
  2. Put the RIG into Repeater shift for the 1296 MHz band, By pressing the + RPT KEY.
  3. Set the OFFSET to 59.999.9.
  4. Tune the RIG to the Lowest band edge, of 1240.000.0 MHz.
  5. Press the REV KEY ( KEY 5 ).
  6. Press the UP MHz BUTTON.
  7. Repeat steps 5 & 6 Alternating between both until you get the Frequency down to 1180.000.0 MHz.
  8. Increase the OFFSET to 99.999.9.
  9. Repeat steps 5 & 6 Alternating between both until you get the Frequency down to 1140.000.0 MHz.
STAGE 2


You should now have 1299.999.9 MHz in VFO B,
And 1140.000.0 MHz in VFO A.

Make sure that the OFFSET in the PMS is set at 99.999.9.
Make sure that you have the Repeater Shift set in the + RPT position.
  1. Press the F key followed,by the PMS KEY ( KEY 3 ).

    You have just stored the New band edges in your PMS.

  2. Press the PMS KEY again, now Tune to the Lowest Frequency in the PMS. Which should now be 1040.000.0 MHz.
  3. Press the REV KEY ( KEY 5 ).
  4. Press the UP MHz BUTTON.
  5. Keep Alternating between steps 3 & 4 until you get the frequency down to 1040.000.0 MHz.
  6. Now Press the following KEYs( KEY 9,KEY 2,KEY 4,KEY 9 ).

    The Magic Number is 9,2,4,9.

    You should now have 1040.000.0 MHz in VFO A.

  7. Repeat Step 1.
  8. Repeat step 2,
    and Tune to the lowest Frequency in the PMS.
  9. Repeat step 3.
  10. Repeat step 4.
  11. Keep Alternating between steps 3 & 4 until you get the frequency down to 1000.000.0 MHz, becareful not to go over 1000.000.0 MHz, because the RIG will Automatically Default back to 1040.000.0 MHZ, and you will have to start again from that point.
  12. Repeat step 6.
  13. Repeat step 1,
    By Pressing the Function KEY, Followed by the PMS KEY ( KEY 3 ).
  14. Repeat step 2,
    Press the PMS KEY and Tune across the Two band edges, until you see 1999.999.9 MHz on your Digital Readout,
  15. Now whilst still in the PMS press the VFO B Button.
  16. Press the Magic Number of 9,2,4,9.
  17. Repeat step 1.
  18. Press the PMS KEY,
    But this time Press either of the UP or DOWN scan buttons, Your RIG will now scan between 1000.000.0 MHz and 1999.999.9 MHz or 1999.999.9 MHz to 1000.000.0 MHz.

As stated at the begining of this Modification the RIG will Receive from about 1215.000.0 MHz to around 1326.000.0 MHz.
This Modification is for Receiving only, you can not use it to transmit outside your allowcated Frequency.
Modification of the PMS on the FT-736R for the 220 MHz band


BY G0HEG


Modification of the PMS on the FT736R for 220 MHz, Extended coverage on receive from the front panel can be achieved by means of a few simple but repetitive actions, The receive can be extended from about 216.6 MHz to around 230 MHz By the use of the repeater shift, This gives a coverage of about 13.4 MHz.
There is no need to snip any of the components, And you will not need a soldering Iron for this Modification.
Important notice

Make sure that you put the Highest Frequency into VFO B,
Make sure that you Put the lowest Frequency into VFO A.
When you start this Mod make sure that you are in VFO A,
Because this will save you a lot of work later on.
Instruction


  1. Turn on your Rig.
  2. Put the RIG into Repeater shift for 220 MHz Band, by pressing the + RPT KEY.
  3. Set the OFFSET to 04.999
  4. Tune the RIG to the lowest Band edge of 220.000.0 MHz.
  5. Press the REV KEY ( KEY 5 ).
  6. Press the UP MHz Button.

    You should now have 219.000.0 MHz on your Digital Readout.

  7. Repeat Steps 5 & 6 again Four Times More, Alternating between both Until you get 214.000.0 MHz on your Digital Readout.
  8. Increase the OFFSET to 09.999.
  9. Repeat Steps 5 & 6 five Times More, Alternating Between both until you get 209.000.0 MHz on your Digital Readout.
  10. Increase the OFFSET to 13.999.9
  11. Repeat Steps 5 & 6 five Times More.
  12. Keep on Increasing the OFFSET by FIVE until you get the OFFSET up to 99.999.9.
  13. Keep on Repeating Steps 5 & 6 FIVE Times after every increase in the OFFSET until you Get the Frequency to 120.000.0 MHz.

    Now that you have 120.000.0 MHz in VFO A,
    you should also have 224.999.9 MHz in VFO B.
STAGE 2


  1. Press the F KEY followed by the PMS KEY ( KEY 3 ).
  2. Press the PMS KEY again,

    You have Just stored the New Band Edges in to your PMS, Now press either of the UP or DOWN scan Buttons on your RIG, and you will see your RIG scanning Between 120.000 0 MHz and 224.999.9 MHz, or 224.999.9 MHz to 120.000.0 MHz, But that Depends on which Button you Pressed first.
    Make sure that your RIG is in the + RPT position.

  3. Now Tune to the Lowest Frequency in your PMS, Which should be 120.000.0 MHz.
  4. Set the OFFSET to 99.999.9.
  5. Press the REV KEY ( KEY 5 ).
  6. Press the DOWN MHZ BUTTON.
  7. Repeat Steps 5 & 6 Alternating Between both until you Get the Frequency Down to 20.000.0 MHz.
  8. Now Press the following Keys ( Key 9,Key 2,Key 4,Key 9 Again.

    The Magic Number is 9,2,4,9.

    You should now have 20.000.0 MHz in VFO A, And 224.999.9 MHz in VFO B.

  9. Repeat Step 1.
  10. Repeat Step 2.
  11. Now Tune to the Lowest Frequency in your PMS which should be 20.000.0 MHz
  12. Repeat Steps 5 & 6 Alternating between both until you get the Frequency in the PMS to 00.000.0 MHz care should be taken not to go passed 00.000.0 MHz because the RIG will automatically Default back to 20.000.0 MHz and you will have to start again from That point.
  13. Now Press the Following KEYS (9,2,4,9 in that order).

    The Magic Number is 9,2,4,9.

  14. Repeat Step 1.
  15. Repeat Step 2.

    Now that you are in the PMS you should have 00.000.0 MHz in VFO A and 224.999.9 MHz, Whilst still in the PMS Tune across the Two Band Edges From 249.999.9 MHZ to 00.000.0 MHz until you see 999.999.9 MHz, on your Digital Readout.
    Now Whilst still in the PMS press the VFO B Button.

  16. Now Press the Following Keys( Key 9,2,4,9 in that Order )
  17. Repeat Step 1
  18. Repeat Step 2
You should now have 00.000.0 MHz in VFO A, and 999.999.9 MHz in VFO B.
Now press either of the up or down scan Buttons, and you will find that your RIG will scan up or down depending on the Button you Pressed First.

You will have to set your own Band edges on this Mod Because I am not allowed to have this board in My RIG, as far as I am aware KU2A is the only one who as done this MOD He told me that the Band edges were 216.6 MHz to 230 MHz His comments were "It Works Well "
FT-736R CAT Interface Drivers


Here are some routines to drive a Yaesu FT736R CAT interface.

Note that the radio has TTL levels, so you need to build a circuit to convert RS232 voltages to TTL voltages. You can do this with a MAX231 etc, or a couple of NPN transistors. The latter can be mounted inside your DB25 connector.

  1. The Yaesu spec contains one or two typos which are herein corrected.
  2. It does not appear to be necessary to space out the 5 control bytes by 50 ms; 20 ms is adequate. Any less sometimes fails.
  3. The READ S-meter, squelch functions often fail to return all 5 bytes, so the code (FNget) accomodates this. 

REM
REM                 FT736R CAT Interface Drivers
REM                 ----------------------------
REM                  Last modified 1991 Oct 18
REM
REM                  (C)1991 J R Miller G3RUH
REM
REM  Procedures and functions available are:
REM
REM      PROCcat(on|off)
REM      PROCmode(lsb|usb|cw|cwn|fm|fmn)
REM      PROCptt(on|off)
REM      PROCsplit(off|plus|minus)
REM      PROCoffset(MHz)
REM      PROCfreq(MHz)                (* e.g. MHz = 145.6789 etc *)
REM      PROCfull_dup(on|off)
REM      PROCsat_mode(tx|rx , lsb|usb|cw|cwn|fm|fmn)
REM      PROCsat_freq(tx|rx , MHz)
REM      FNsqlch                      (* returns 0 if no signal *)
REM      FNmeter                      (* returns S-meter value  *)
REM
REM
REM        Example - prepare FT736R for FUJI-OSCAR-20 satellite
REM       
====================================================
PROCset_up:   REM Do once only per session!
PROCcat(on)
PROCfull_dup(on)
PROCsat_mode(rx,usb): PROCsat_freq(rx,435.916)
PROCsat_mode(tx,fm ): PROCsat_freq(tx,145.850)
PROCcat(off)
END
:
REM Now follows procedures and functions
:
DEF PROCcat(F%)
IF F%=on B%(5)=0 ELSE B%(5)=&80

PROCput: ENDPROC
:
DEF PROCmode(B%(1))
B%(5)=7: PROCput: ENDPROC
:
DEF PROCptt(F%)
IF F%=on B%(5)=8 ELSE B%(5)=&88

PROCput: ENDPROC
:
DEF PROCsplit(F%)
B%(5)=&89: REM simplex
IF F%=plus B%(5)=&49

IF F%=minus B%(5)=9
PROCput: ENDPROC
:
DEF PROCoffset(F)
B%(5)=&F9

PROCfr(F)
PROCput: ENDPROC
:
DEF PROCfull_dup(F%)
IF F%=on B%(5)=&E ELSE B%(5)=&8E

PROCput: ENDPROC
:
DEF PROCsat_mode(F%,B%(1))
IF F%=tx B%(5)=&27 ELSE B%(5)=&17

PROCput: ENDPROC
:
DEF PROCfreq(F)
B%(5)=1
PROCfr(F)
PROCput: ENDPROC
:
DEF PROCsat_freq(F%,F)
IF F%=tx B%(5)=&2E ELSE B%(5)=&1E

PROCfr(F)
PROCput: ENDPROC
:
DEF PROCfr(F)
IF F>=1000 FX%=on ELSE FX%=off
F=(F+0.000005)/1000
FOR I%=1 TO 4: F=F*100: F%=INT(F): F=F-F%
B%(I%)=(F% DIV 10)*16 + F% MOD 10
NEXT
IF FX%=on B%(1)=B%(1)AND &F + &C0: REM 1200 MHz band corrrection
ENDPROC
:
DEF FNsqlch
B%(5)=&E7: PROCput: PROCget
IF B%(1)=0 THEN =0 ELSE= -1
:
DEF FNmeter
B%(5)=&F7: PROCput: PROCget
=B%(1)
:
DEF PROCset_up
REM Establish constants etc
DIM B%(5)
off=0: on=-1
rx =0: tx=-1
plus=+1: minus=-1
lsb=0: usb=1: cw=2: cwn=&82: fm=8: fmn=&88

:
REM Most code after this is for controlling the BBC micro hardware
REM and needs recoding for any other machine.  Note "*FXn,m" is
REM merely a BBC micro operating system call, no. n, parameter m.
REM The notation &82 means 82 hex.
REM
REM Set up RS423 = 4800,8,N,2
*FX8,6
*FX7,6
*FX156,16,227
ENDPROC
:
DEF PROCput
REM Procedure sends five bytes to RS432c port, spaced by 50ms
REM bytes are in array B%(1) ... B%(5)
FOR I%=1 TO 5
REM Delay below is in the spec, but can actually be 20 ms 
T%=TIME: REPEAT UNTIL TIME >= T%+5: REM Wait 50 ms/byte
REM Now direct output to RS423, o/p char, and restore o/p to
screen
*FX3,3
VDU B%(I%):  REM Send byte B%(I%) to RS432
*FX3,0
NEXT
ENDPROC
:
DEF PROCget
REM Flush RS432 I/P buffer, then read bytes from input stream
REM until op code is detected.  Previous value is result.  
REM (straight reading 5 bytes found to be unreliable)
*FX15,1
*FX2,1
REPEAT B%(1)=B%: B%=GET: UNTIL B%=B%(5)
*FX2,0
ENDPROC
:
REM End of code
REM de G3RUH @ GB7DDX 1991 Oct 18
JAS>

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