jiffies
Sundial
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by Paul R. Machula
CASSETTE FOR THE ,TM
VIC 20'""and COMMODORE 64TM GAMES
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Use this program for the unexpanded VIC 20 or Commodore 64 as an aid in creating your own sundial
• READY TO RUN PROGRAMS • 1 YEAR (12 issues) 6 MOS. (6 issues)
. . S49.95 S28.95
1 TRIAL ISSUE
$8.50
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VIC 2O™/COMMODORE 64 Investment Portfolio Manager — for the Commodore 64 with disk drive or tape (printer optional), is menu driven and provides one summary page and nine detail pages. Each page can accept nine entries of up to $99,999 each. The program can handle over $8 miliion. The IPM is quick and makes it easy to track
As a resident of Arizona I am an avid fan of our local resident star, the sun. I am also a great admirer of the friendly computer, Com modore's VIC 20. Recognizing the fact that the sun follows natural laws and that a computer is par ticularly adept in manipulating numbers, I decided to use my computer as an aid in producing one of my favorite solar instru ments, a sundial. The program "Sundial" will help anyone else who wishes to make their own dial. It may be helpful to those who are unacquainted with dials (as well as "Sundial") to consider the following points:
volatile assets such as stocks and stock options. The
summary page displays the grand total and the per cent of grand total for each of nine investment categories. Price: $14.95
Disk Directory Manager — for the VIC 20 (16K min. exp.) or Commodore 64 with 1540/41 disk drive and 1525 printer. The DDM is a handy utility which inputs directly from the directories of
diskettes and sods up to 1556 records on the Commodore 64 and up to 1047 records on the VIC 20. Each record contains file name, file size, file lype and disk ID. A page formatted master direc tory is sent to the printer, The DDM is written completely in fast and efficient machine language. Price: 519.95 Ridge Runner — for the unexpanded VIC 20 on
tape or disk format. 100% mactiine language. Maneuver your multicolor U.F.O, through a field of blinking mines while blasting spinning asteroids and various enemy ships with laser fire. Features include a horizontally scrolling playfield, hi-resolution/multicolor graphics, excellent sound, high score, pause button, bonus ships, and ever increasing levels ot difficulty. Joystick required. Price: S14.95
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COMMODORE: POWER/PLAY Winter 1983
1. Time indicated on a sundial is not standard {"watch") time. For standard time, corrections must be made for the local longitude difference and the equation of time. If these values are desired they are obtainable from almost any book on dialling. 2. All dials are accurate only for the latitude for which they are made. It is for this reason that the INPUT statement on latitude is included in "Sundial" (line ten). 3. Hour angles are measured from the center of dial (low point of gnomon), not from the foot of the high point of the gnomon. (The gnomon is the wedge-shaped piece that
casts a shadow on the dial.) 4. The angle of the style (upper edge of gnomon) must be equal to the latitude of the dial's position. The gnomon must be mounted perpen dicular to the dial face.
5. In order to function properly the dial must be oriented cor rectly: the dial face must be level and the high point of the gnomon must point, not towards the sun, but to true north (pole star, not mag netic north). 6. The lengths of the hour lines and of the style are irrele vant; rather, their angles are essential. 7. "Sundial" uses decimal degrees. If degrees-minutesseconds are desired the pro gram must be slightly modified.
8. The time values in "Sundial" occur at five-minute intervals. 9. The hour angles indicated in "Sundial" are actually appli cable to two time values (a.m. and p.m.). For example, the hour angle for time value 11:55 a.m. is the same as 12:05 p.m.; 11:50 a.m. is the same as 12:10 p.m.; 11:45 a.m. is 12:15 p.m., etc.
10. "Sundial" prints the time val ues and hour angles onto the screen continuously (no scroll stop). The operator may wish to use the RUN-STOP key together with the command
CONT to stop the scrolling, allowing time to copy the val ues. The CONTROL key could also be used.