CAPUTE!

Atari Laser Chess™ On Disk

The Laser Chess program on the April–June COMPUTE! Disk for Atari computers will not run properly when selected from the disk menu. However, the program runs just fine when loaded and run without the menu. Simply use the command RUN "D:LASER.JUN".

IBM Fast Fractal Landscapes

This program from the June issue (p. 88) works as published on IBM PCs and compatibles equipped with color/graphics adapter (CGA) cards or equivalent hardware. However, we have learned that the landscape display may be distorted when the program is used on systems with enhanced graphics adapter (EGA) hardware. The program may also fail to perform properly on high-speed PC AT and compatible systems, even when CGA hardware is used. We regret that there is no simple solution to this incompatibility problem.

The Power Of ON-GOTO And ON-GOSUB

The "Calendar" program in this article from the August issue (p. 105) reports incorrect weekdays for dates in some leap years. This problem occurs because the formula used in line 110 requires greater numerical precision than the Atari provides. Reader Paul Schaefer suggests a modification, which substitutes an alternate date formula known as Zeller's Congruence. Add or replace the following lines:

85 ON YEAR < 1752 GOTO 180:
ON (YEAR = 1752 AND M < = 9
AND DAY < = 13) GOTO 180
110 X = M + 10 : IF X > 12 THEN X
= X - 12
112 C = INT (YEAR/100) : D = YEA
R - C * 100 : IF X > 10 THEN
D = D - 1 : IF D < 0 THEN D = 9
9 : C = C - 1
114 DAYS = DAY + INT (2.6 * X - 0.
02) + D + INT (D/4) + INT (C/
4) - 2 * C

This modification also needs to be made to the version of the program supplied on the July–September COMPUTE! Disk. The program is stored on the disk with the filename ONGOTO.AUG.

Pop-Up ASCII Table For IBM

This program, from the August issue (p. 91), is not compatible with the IBM PCjr. It should, however, function properly with any other IBM model or compatible.