The committee determines character locations for foreign, technical, and graphic characters. The advent of modern font formats, such as Postscript and Truetype, permitted large sets of international standards and so Unicode was developed by an international committee. (Don’t get me started on using “O-slash” for diameter!) Later, when the ANSI code was developed for handling 255 characters, it added mostly foreign characters and still there was no location for diameter. What Autodesk did was add these characters to specific locations in their font definitions. In CAD, the immediate need was for special characters, such as degree, plus/minus, and diameter. This was carried over from teletype machines: when a letter was pressed on one machine, the same letter would be printed out at the receiving end.īut ASCII had specifications for only 128 characters, of which the first 30 were for controlling the teletype machine. When the first CAD systems came out, there was only the ASCII standard for character codes. VersaCAD was an early exception, as it had a system by which the user could select the output scale and it would display the desired pen weights on the screen. But it was still a while before you could see the effect of adding a pen weight to a font on the screen. As font technology developed, the need for WYSIWYG - What You See is What You Get - displaying of fonts became standard.
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