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- CLS.COM - A "SCREEN" DOCUMENTARY.
-
- Dear Friends:
-
- I suspect that most of us have wished that the earlier versions of
- CP/M had a clear screen - home cursor command. I know I have. For that matter,
- I also always wanted the command in early versions of Microsoft (TM) Basic.
- Remember though, when Gary Kildall wrote CP/M and Bill Gates wrote the
- first versions of Altair Basic, (for you young folks - this was in the Dark
- Ages - 1975 and 1976), most of the micro-computer community used as their
- terminals the terrible, noisy, 'leaks oil like some cars', MONSTER called
- a Teletype (TM) Model 33.
- I built an Altair (TM) 8800B, (like the one Steve Jobs and Steve
- Wozniak could not afford) which started this whole thing, from the kit in
- early 1977 and had such a terminal.
- If anyone ever knew how to 'home the cursor and clear the screen'
- on a Teletype (TM), I never heard of it here in Mississippi and I doubt
- somehow that anyone else did either.
- Therefore, please "forgive" Gary Kildall and Bill Gates for not
- including these commands in their early programming 'works of art'.
- I certainly have.
- Still, I have always wanted this command and it is not even present
- on my version of CP/M vers. 2.2G (for my Kaypro 4 84).
- Therefore, in an uncharacteristic 'fit' of energy recently, I came
- up with the enclosed 'life work epic' which must run at least 15 or 20 bytes
- of 'dreaded' machine language code. If you study it carefully, it is a
- bit more elegant than you might, at first, suspect.
- Not surprisingly, I call it CLS.COM.
- I have used this little program with great pleasure for the past few
- months and now I would like to share it with you. I know, because of that
- 'feature' of CP/M, that any program, no matter how small, takes up 2K of
- disk space; but I think it is worth the space - even if it's on every disk.
- I find that it is my third most used program, right behind SD.COM
- and NSWEEP.COM.
- I like it so much that my 'pride of authorship' and ego want me to
- stamp it with my name - or initials, at the very least - especially since
- I am sure that it is the only program I have ever written that amounts to
- a 'hill of beans'.
- Alas! If I did that, it would defeat the whole purpose of it,
- wouldn't it?
- Sometimes, "life is not always fair" as President Kennedy once
- reminded us.
- Oh, well, for what it's worth, here it is and I really do hope you
- enjoy it but, please...
- If you ever see my name again, just mumble, "I've seen that name
- somewhere before, but I don't remember where!"
-
- Regards, ERNEST SPENCER of Jackson, Ms., W5PQY. 06/06/85