The Signetics 2650 - The MESSUI Place

Use your 2650 system
to generate random Morse!
Trying to learn Morse code? The best way is to have an obliging by RICHARD ROGERS, VK7R0
"old timer" send you random groups of letters and numbers, so 4/439 Huon Road, South Hobart 7000
that you don't anticipate or "journalise". For those lacking an
obliging friend here is the next best thing — a program which turns
your 2650 Mini Computer into a random Morse generator.
One of the common errors of
beginners in copying Morse code is to
"journalise", or write down the end of
a word before it has been sent!
Random code groups are an excellent
practice material to help combat this
tendency. Once you are able to copy
random groups, plain language will
seem easy. Also, with random code
there are many more chances to hear
the letters which occur infrequently in
plain language.
The program described here was
originally written for my Central Data
2650 system, but the program as listed
has been modified to suit systems using
the Pipbug monitor program, like the
EA 2650 Mini Computer.
The program generates fivecharacter
groups consisting of four
letters and one figure, eg ZF9OB 81LUY
etc, at speeds ranging from 3 to 25
words per minute. The starting speed is
selectable and the speed increases by
one WPM every five minutes. The
current speed is displayed on the VDU.
Below 10WPM, the characters are sent
at a 10WPM rate but the spaces
between the characters are increased,
As written, the program generates a
tone at the 2650 flag output. The tone
frequency used is ignored by a 110
baud VDU and nothing is printed on
the screen during the morse output. I
use a loudspeaker in series with a 1000
ohm resistor, connected between the
output of the flag buffer and earth, as a
monitor.
The program may be changed to give
a voltage suitable for controlling an
external oscillator by changing the
code at 04A3 from 76 to 74.
Some NOP's are provided within the
program to facilitate the use of any
other output port. For instance, the use
bit 0 of output port D as the tone
output, the following code changes are
required.
05EB change from CO CO CO CO to 04 00
F0 CO
049D change from 74 40 CO CO to 04 01
F$ CO
At right is the full hex listing of the author's random
Morse program. It starts at 0440.
86 ELECTRONICS Australia, December, 1979
04A3 change from 76 40 co co to 04 00
FO CO
04 AE change from 76 4Q CO CO to 04 00
F O CO
The program may also be modified to
generate five character groups of
mixed letters, figures and punctuation
by changing 04F8 from 18 26 04 1A to CO
CO 04 30.
My thanks to Ron Brown, VK7ZRO,
for allowing me to test the program on
his system.
0446 IF 05 El 60 88 AS 90 40 28 DO 08 20 78 BO 48 El
0450 AO FO 68 DB 56 10 CO 30 18 70 98 B8 C8 7C 3C IC
0460 OC 04 84 C4 E4 F4 FC 56 CE E2 32 7A 86 94 84 B6
0470 4A 8C 54 00 00 (5 It 19 15 IA OF 38 2F 3B 2D 38
0480 2B 3B 29 38 27 38 25 3B 23 17 38 OF 3B OD 3B OB
0490 3B 1A DI 45 FE E5 80 18 6C 114 5A 06 00 74 40 CO
04A0 CO 3B 14 76 40 CO CO 3B OE FA 72 17 06 It 76 40
0480 CO CO 38 03 FA 78 17 04 5C F8 7E 17 09 14 OD 64
04C0 D3 85 01 E5 17 IA 02 05 00 C9 07 88 64 D3 CD 64
04D0 D3 17 II Of it 12 03 04 05 06 07 08 09 OA 0B 0C
04E0 OD OE OF 16 11 12 13 14 15 16 67 05 04 15 CB 29
04F0 OA 24 38 3C C8 20 08 IE 18 26 64 to C8 ID OA 17
0500 3B 2E C8 13 CI OD 64 43 CF 65 IA A7 01 14 08 06
6516 A4 01 C8 02 IB 62 01 Of 00 60 66 00 00 le 00 06
0520 04 IA C8 75 OA 72 31 08 C8 6E Cl OD 64 5D 111 58
0530 3F 04 BC 82 to 03 E8 61 16 AS 5E 1B 77 3F 04 EA
0540 07 06 OF 65 19 Cl 3F 04 75 3B 90 38 8E FB 73 64
0550 01 88 67 E4 Of 15 C8 02 111 63 OA 04 00 OE 25 97
0560 14 3F 02 B4 18 77 01 Et 00 00 00 00 77 OE 08 79
0570 05 00 07 11 75 01 DI 85 01 18 04 E9 6C IA 06 77
0580 01 A9 66 7? 61 06 62 OE 45 6A DO CE 65 6A 5A 77
0590 FB 64 09 57 75 FF 17 00 OA IA ID 52 41 4E 44 4F
65A6 4D 26 4D 4F 52 53 45 20 44 45 20 56 48 37 52 4F
0580 OA OD 31 33 20 2D 20 32 35 20 57 50 4D OA OA OD
15C6 53 54 41 52 54 49 4E 47 20 53 56 45 45 44 3F IA
OHO ID 00 0A OD 20 20 57 50 4D 00 E7 30 1E 00 ID E7
05E1 39 ID 00 1D 47 OF 17 76 40 75 FF CO CO CO CO 06
05F0 00 3F 65 50 3F 04 BC 12 IA 7A 3F 02 86 C3 3F 02
0660 84 3B 57 D3 03 DO DO 83 CC 05 68 3F 02 86 C3 3F
0610 02 84 3B 46 BF 15 68 CF 05 68 66 3E 3F 05 58 OF
0620 05 68 E7 19 ID 00 ID E7 03 IE 00 ID E7 69 19 10
0630 A7 02 04 79 06 02 82 FB 7D CC 05 5C 05 30 18 to
0640 CF 05 69 IC 05 66 CC 05 6A OC 05 67 CC 05 6B 3F
0650 05 6C 64 89 CC 05 5C OD 05 6B CD 04 9C DI CD 04
0660 AD OC 65 68 Cl DI 81 81 CC 05 54 20 CC 05 5A 3F
1670 05 3D 06 37 3F 15 50 OD 05 68 E5 19 18 62 85 01
0680 CD 05 68 ES OA IA OA ES 14 IA 04 85 OC ID 02 85
0690 06 3F 02 69 IF 06 IA