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When you use the UNDO feature the internal arrays are restored in reverse order.
Likewise, when you use REDO, the internal arrays are used in forward order. The penalty
for having this extensive feature is a slight delay when switching from one program to
another as the internal arrays are downloaded to the hard drive. There are no significant
delays when editing individual programs.
When you change the current program, these internal arrays are downloaded onto your
hard drive, so that if you go back to this program, the undo features are still operational
by uploading these internal arrays. This applies to all ten possible open programs. All the
hard drive files associated with open programs are deleted when you EXIT the editor.
Only the relevant hard drive arrays are deleted when you CLOSE a program.
PRINTING HARDCOPY
The editor offers you two strategies for listing hardcopies of your programs. The first is a
legacy method sometimes referred to LTPR or line printer. The second method treats the
printer as a virtual window, which allows both PRINT and PLOT instructions. Some
commercial printer (HP) drivers have difficulty responding to both these print methods.
In version 6.007 an extra print method has been added, which uses a thirty party freeware
program called “prfile32.exe” to execute hard copy printing. The editor automatically
searches for this program. If it has been installed on your computer, then the editor will
use it.
There is another third party freeware program called “hardcopy.exe” which installs an
extra green printer icon in the top right corner of all windows. Clicking this button
produces a hardcopy graphics picture of the current window. This can be used to
hardcopy print the output window, for example, as well as visible portions of the current
program in the editor window.