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CoCo Urbane

Editing Urbane in Basic

Basic needs line numbers. Urbane uses the two bytes that basic uses for its line numbers for a zero byte and a screen lines in a file line count. The zero byte lets me look backwards in the file to the beginning of the previous line. The screen lines in the file line lets me see how far up in the screen I’m going. When I exit urbane I will renumber the file. When I enter urbane I’ll replace the line number bytes with my zero byte of nine for the screen lines in a file line. The maximum count is eight, so I’ll know I need to find the real count the first time I look at a line. I’ll store the count so I won’t have to do it again. Oh yeah. I discovered that Vcc has a break key. It’s <home>. Now I exit urbane when I press <home> and I delete the current line when I press shift-down-arrow. I used to use a shift-down-arrow to exit from the urbane editor. Letting the user edit the file in basic has the problem that he can edit the end of file line with disastrous results. He can also edit the symbol table which could be useful if he knew what he was doing. Changing a name in the symbol table would change it everywhere in the file. I need to give it more thought. Oh yeah. At my son’s suggestion I quit putting a phantom asterisk at the top of the file and I let the user see the end command and colon in addition to the asterisk at the end of file line. I think what I’m going to work on now is letting the user move up one screen line at a time instead of moving up one file line at a time and moving to the start of that line. I’m going to make it like the editor I use when developing urbane.  

By earlcasper

Retired US Postal Clerk. BS at University of Washington. Studied computers at Arizona State University. Lives in Kansas City KS.

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