Although TRIANGLE is a DOS-based program, it uses a special character font that may create difficulty if not properly loaded. The screen font defined in the GS8.FNT file is used to display special GS character symbols as well as the graphic images used in the graphing calculator and touch-and-tell figure viewer features.
GS8.FNT is the GS screen font file for the GS characters that occupy ASCII character positions below 32 and between 127 and 255. Standard characters that are displayed on a DOS screen occupy positions between 32 and 127. The GS8 font is loaded automatically by TA.EXE provided the computer video driver is fully VGA-compatible.
Since TRIANGLE uses most of the lower memory, it may be useful in older
DOS computers (x386) to load the operating system into upper memory. DO
THE FOLLOWING IF YOU ARE USING ONLY DOS, AND ONLY IF YOU ARE HAVING
DIFFICULTY DISPLAYING THE GS FONT SET.
Edit your CONFIG.SYS file with the commands:
cd c:\
edit config.sys
And then add the following lines to the start of the file:
DEVICE=C:\DOS\SETVER.EXE
DEVICE=C:\DOS\HIMEM.SYS
DOS=HIGH
Save the file, exit, and restart the computer.
Some older computers, particularly older portables with LCD screens, are not fully VGA-compatible and will not display the GS fonts. A blind person can still use TRIANGLE on such computers, but the screen will not display the correct ASCII characters below 32 and above 127. Screen reader software, when properly configured, will still correctly read the GS characters.
If you are using TRIANGLE under a DOS window in Windows'95 or Windows'98, the characters will only be properly displayed when using the Full Screen mode. To activate this setting, either click on the Full Screen icon located at the top of the window (this icon is a white box with four red arrows) or press the Alt-Enter keys. Alt-Enter toggles between full screen and window settings.
Still have questions about TRIANGLE? Send e-mail to: triangle@dots.physics.orst.edu