Modifications Or Corrections To Previous Articles
Atari XL Compatibility Update
Upon testing with our new 800XL, we have been pleased to discover that the vast majority of our previously published Atari programs will run without modification. Of the few programs that will not run as is, almost all, including the popular "Scriptor" word processor (April 1983), operate properly when used with the Atari Translator. This program, available on a disk (DX5063) from Atari, enables most programs written for the older Ataris to be run on the new XL models. So far we have discovered only two programs, "Demons Of Osiris" (January 1984) and "Ski" (February 1983), that the Translator cannot cure. These programs can be run on the new computers only if you have a BASIC cartridge from the older Atari series to plug in.
For information on obtaining the Translator disk, call Atari's Customer Relations Department at 800-538-8543 (inside California, 800-672-1404).
MLX For Commodore 64
There is an error in the article accompanying the "MLX" machine language editor program in the March and May issues. The article states, "If you enter less than three digits, you can press either the comma, SPACE bar, or RETURN key to advance to the next number." However, when the numeric keypad feature was added to MLX, the comma key was redefined as the numeral 2. As a result, the comma key can no longer be used to advance to the next number; however, the SPACE bar and RETURN key still work as stated.
A number of readers have expressed concern at the number of revisions to MLX since it was first published. These changes generally represent enhancements, not corrections. Any version of MLX may be used to type in any program for the 64 presented in MLX format, regardless of whether the program is from COMPUTE!, COMPUTE!'s GAZETTE, or a COMPUTE! book. The only version of 64 MLX known to contain a bug is the one from the March issue, and the correction was given in the May "CAPUTE!" column.
Automatic Proofreader For The 64
The final paragraph of the article which accompanies the "Automatic Proofreader" program each month indicates that on the 64 the Proofreader can be protected during tape LOADs and SAVEs by typing POKE 178,165. Richard Murphy points out that the proper value to protect the Proofreader is POKE 178,251. This POKE is not necessary for disk operations.
64 Hi-Res Screen Printing
Many readers have asked for a way to print a copy of the elaborate designs they create with the "3-D Plotting" program from the May issue (p. 58). Reader Henry Mervis observes that, for Commodore 64 owners, the solution is in the same issue, in the "Hi-Res Graphics Editor" program (p. 82). To create a hard copy of the results of the 3-D Plotting programs (or of almost any other hires screen display), load the machine language program you created for the Hi-Res Editor (Program 2, p. 80), using the LOAD command format described on page 82. Remember to enter the line to move the BASIC memory area:
POKE 642, 128 : POKE 44, 128 : POKE 32768, 0 : NEW
Next, load either "Rectan" (Program 1, p. 60) or "Spheri" (Program 2, p. 62). For Rectan, change line 600 to read 600 SYS 49152; for Spheri, change line 610 to 610 SYS 49152. Then RUN the program in the normal manner. When your design is complete, a rectangle will appear on the screen. Turn on your printer and press the P key and your design should begin to print.
The screen dump routine will work only on a Commodore 1525 printer or with an interface that emulates the 1525. The routine will not work with Commodore 1526 printers.