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Tap dancing

Get your dots and dashes sorted out with this offering from Bob Baxter Morse Code has proved essential for world communications. From the early Telegraph to DX working, the Samuel Morse code provides us with a format which is quite easy to learn and an international standard for communicating over long or short distances. Where once communications or signals were restricted to a 'line of sight' only, Morse started us on a road where civilisation began to talk over short and then long distances. The fate of nations and the history of the world has been changed due to Samuel Morse and the simplicity and reliability of the Didah language.

This program has been developed primarily as a learning tool for those wishing to sit for their Post Office Amateur Radio Licence. The British morse test is 12 groups/min whilst the Americans subject their novices to only 5 g/m. With this in mind, the program has a variable speed menu which should suit the very beginner and the more experienced.

Option seven is not used in this program. It is included to facilitate the further expansion of a routine for hardware interface to a transmitter.
Although the program has been timed using a stopwatch for the 12 and 18 groups, the X variable may be adjusted to suit if the program or routines are modified in any way. Likewise the Tone and Volume controls may be adjusted accordingly. The Duration of the sound may also be adjusted, although care should be taken that the duration does not exceed that of the fastest group's time penods of the pulses. Experimenting with Envelope shaping may prove interesting here.

Program Notes

Line No

  • 10-100 Initial Setup
  • 120-230 Titles
  • 250-400 Main Menu
  • 420-550 Adjustment Menu
  • 570-660 Volume Adjustment
  • 680-750 Speed Adjustment
  • 770-890 Tone Adjustment
  • 910-960 Tone Sounder
  • 980-1020 Time/Delay Counter
  • 1040-1250 Selection & Printout
  • 1270-1300 Random Letters
  • 1320-1350 Random Numbers
  • 1370-1400 Random Procedures
  • 1420-1450 Mixed Groups
  • 1470-1600 Keyboard Output
  • 1620-1630 Transmission Interface (not used)
  • 1650-1720 Instructions
  • 1740-2110 Morse Table
  • 2130-2190 Data Bank
Variables
  • Char Ascii Character
  • Grp Groups 1-36
  • Tn Tone Level
  • Dur Sound Duration
  • Vol Volume Level
  • Sp Output Speed
  • Cv Character Value
  • Ds Data Store Pointer
  • Gc Gabbage Collection
  • X Time Variable
  • Dc Data Character
  • P Delay Period
  • D Delay Counter
PopularComputingWeekly850808

★ PUBLISHER: Popular Computing Weekly
★ YEAR: 1985
★ CONFIG: 64K + AMSDOS
★ LANGUAGE:
★ LICENCE: LISTING
★ AUTHOR: Bob Baxter

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L'Amstrad CPC est une machine 8 bits à base d'un Z80 à 4MHz. Le premier de la gamme fut le CPC 464 en 1984, équipé d'un lecteur de cassettes intégré il se plaçait en concurrent  du Commodore C64 beaucoup plus compliqué à utiliser et plus cher. Ce fut un réel succès et sorti cette même années le CPC 664 équipé d'un lecteur de disquettes trois pouces intégré. Sa vie fut de courte durée puisqu'en 1985 il fut remplacé par le CPC 6128 qui était plus compact, plus soigné et surtout qui avait 128Ko de RAM au lieu de 64Ko.