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- NOTES ON DARKSCRN.COM
-
-
- Matt Roberts
- 3 Cedar St., # 8
- Montpelier, Vt 05602-3006
-
- 07-12-91
-
- ───────────────────────────────────────────────────────────────────────────────
- DARKSCRN.COM is a simple screen blanker. It's used from the DOS prompt. The
- screen goes blank, the cursor disappearing as well. The screen comes back
- when you touch a key, but the data that was on your screen has been removed,
- and you have just a DOS prompt in the upper left corner. That's about all
- there is to it. Told you it was simple.
-
- I wrote DARKSCRN because I didn't need something that automatically blanked
- every three, five, or ten minutes. When I'm in a program, I'm usually in it
- to do a job and get out. As a result, most of the idle time is spent at the
- DOS prompt. Most of the programs I use regularly have a DOS shell, so if I
- really need to leave in the middle of a job, I can shell, invoke DARKSCRN,
- touch a key when I'm ready to continue, and type EXIT to return to my program.
-
- I have yet to encounter a situation where I wished I hadn't cleared the screen
- contents, so I've never bothered to save them. In short, I have simple needs,
- so I wrote a simple utility.
-
- A NOTE ON THE WHY OF SCREEN BLANKERS
-
- The inside of your monitor's cathode-ray tube is coated with phosphorous
- (unless it's an LCD display). When the electrons hit the phosphorous, it
- glows. This is called "exciting" the phosphorous, and creates text, graphics,
- and what-not on your screen.
-
- As with people, phosphorous can take just so much excitement. Every time it's
- "excited", some of it is used up, and eventually the screen wears out. This
- takes a long time, and you shouldn't be alarmed if you haven't used a screen
- blanker for years. After all, you haven't used a screen blanker for years (is
- there an echo in here?), and everything is probably still fine. The problem
- is that the phosphorous wears out in some places more than others, for
- instance at the upper left corner of your screen.
-
- The aforementioned corner is where the DOS prompt is parked at the exit of
- most programs, such as word processors, spreadsheets, and the like, after
- you've been sent back to the system. Since the phosphorous in that corner
- (for example only; you may have other trouble spots) is "excited" more than in
- other areas, it gets worn out faster. You then get a "hole" in your screen.
- Data and graphics can't write to it, because the electrochemical process can't
- take place any more. This drives most folks to distraction, and they end up
- junking what should have been a perfectly good monitor because of that little
- "burn". While hardware prices have been going down, considerably, monitors
- don't come free. You can probably extend your monitor's practical life by a
- considerable amount by using a screen blanker, thereby saving precious
- resources; namely, money.
-
- A FINAL NOTE, AND THEN I'LL SHUT UP (FOR A WHILE)
-
- I have a bad habit of using all eight letters allowed by DOS for my programs.
- I don't know why that is, but I don't feel quite right unless I've got an
- eight-letter filename. I finally stopped adding extensions to my directories,
- 2
- but only because I couldn't read my DIR output any more.
-
- Anyway, you can rename this file to anything your little heart desires; D.COM,
- DS.COM, WHOCARES.COM, etc. This will save a little typing if you use the
- blanker a lot during the day. I've programmed my Alt-F1 key combo to call the
- blanker, so I left the long name, but you do what's right for you. If you do
- change the name, however, and then pass the blanker along to someone, I'd
- appreciate it if you'd rename this document file so it matches the blanker's
- new name. That'll make it easier for folks to find the documentation, and to
- get in touch with me if they have trouble with any of my programs.
-
-
- DARKSCRN.COM was created using ASIC 1.00, a shareware BASIC compiler by David
- Visti. Registration is currently only $10.00 for version 3.01, which is a
- major bargain in my opinion. He can be reached at P.O. Box 2952, Raleigh, NC
- 27602-2952. I compiled this with version 1.00 because it creates a slightly
- smaller .COM file. It's possible that it loads just a tiny bit slower, but I
- didn't think it was enough to warrant the extra 20 bytes or so.
-
- All right, I promised I'd shut up, so I will. Comments, suggestions, and
- criticisms can be sent my way, via the address above, and are greatly
- appreciated. I want to write quality software, and I need your help to do it.
- Thanks.
-