willsort
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『第
6 楼』:
Re F60:
字符代表屏幕上可显示的符号，它不仅可以是一个英文字母，也可以数字、标点和其他键盘上的可打印字符，它还可以是一个中文字，一个阿拉伯字母或者任意的一个多国语言符号，甚至它可以是一个图形（当然，它需要有对应的编码与字模）。
一个汉字是一个字符，只是在很多汉字编码（例如GB 2312）中它占用两个字节，它通常在ＤＯＳ屏幕显示占用两个英文字符的位置，所以很多材料中近似的把双字节编码的字符看作两个“字符”。在Windows或其它新型的操作环境和应用程序中，汉字都已作为一个字符看待，比如编程语言VB或者ＣＭＤ命令set。
Re fdsiuha:
赞同你的见解，现补充一篇Qbasic关于屏幕显示模式的文档：
| Quote: | ------------------------------------------------------------------------------
The following table summarizes screen modes:
----------MDPA, CGA, Hercules, Olivetti, EGA, VGA, or MCGA Adapters-----------
SCREEN 0: Text mode only
- 40 x 25, 40 x 43, 40 x 50, 80 x 25, 80 x 43, or 80 x 50 text format,
8 x 8 character box (8 x 14, 9 x 14, or 9 x 16 with EGA or VGA)
- 16 colors assigned to any of 16 attributes (with CGA or EGA)
- 64 colors assigned to any of 16 attributes (with EGA or VGA)
- Depending on the text resolution and adapter, 8 video memory pages
(0-7), 4 pages (0-3), 2 pages (0-1), or 1 page (0)
-----------------------CGA, EGA, VGA, or MCGA Adapters------------------------
SCREEN 1: 320 x 200 graphics
- 40 x 25 text format, 8 x 8 character box
- 16 background colors and one of two sets of 3 foreground colors
assigned using COLOR statement with CGA
- 16 colors assigned to 4 attributes with EGA or VGA
- 1 video memory page (0)
SCREEN 2: 640 x 200 graphics
- 80 x 25 text format, 8 x 8 character box
- 16 colors assigned to 2 attributes with EGA or VGA
- 1 video memory page (0)
---------------------Hercules, Olivetti, or AT&T Adapters---------------------
SCREEN 3: Hercules adapter required, monochrome monitor only
- 720 x 348 graphics
- 80 x 25 text format, 9 x 14 character box
- Usually 2 video memory pages (0-1); 1 page (0) if a second color
display adapter is installed
- PALETTE statement not supported
- Invoke the Hercules driver MSHERC.COM before using screen mode 3
SCREEN 4:
- Supports Olivetti Personal Computers models M24, M240, M28, M280,
M380, M380/C, and M380/T and AT&T Personal Computers 6300 series
- 640 x 400 graphics
- 80 x 25 text format, 8 x 16 character box
- 1 of 16 colors assigned as the foreground color (selected by the
COLOR statement); background is fixed at black
- 1 video memory page (0)
- PALETTE statement not supported
-----------------------------EGA or VGA Adapters------------------------------
SCREEN 7: 320 x 200 graphics
- 40 x 25 text format, 8 x 8 character box
- Assignment of 16 colors to any of 16 attributes
- If 64K EGA adapter memory, 2 video memory pages (0-1); otherwise,
8 pages (0-7)
SCREEN 8: 640 x 200 graphics
- 80 x 25 text format, 8 x 8 character box
- Assignment of 16 colors to any of 16 attributes
- If 64K EGA adapter memory, 1 video memory page (0); otherwise,
4 pages (0-3)
SCREEN 9: 640 x 350 graphics
- 80 x 25 or 80 x 43 text format, 8 x 14 or 8 x 8 character box
- 16 colors assigned to 4 attributes (64K adapter memory), or
64 colors assigned to 16 attributes (more than 64K adapter memory)
- If 64K EGA adapter memory, 1 video memory page (0); otherwise,
2 pages (0-1)
-----------------EGA or VGA Adapters, Monochrome Monitor Only-----------------
SCREEN 10: 640 x 350 graphics, monochrome monitor only
- 80 x 25 or 80 x 43 text format, 8 x 14 or 8 x 8 character box
- Up to 9 pseudocolors assigned to 4 attributes
- 2 video memory pages (0-1), 256K adapter memory required
-----------------------------VGA or MCGA Adapters-----------------------------
Screen 11 (VGA or MCGA)
- 640 x 480 graphics
- 80 x 30 or 80 x 60 text format, 8 x 16 or 8 x 8 character box
- Assignment of up to 256K colors to 2 attributes
- 1 video memory page (0)
Screen 12 (VGA)
- 640 x 480 graphics
- 80 x 30 or 80 x 60 text format, 8 x 16 or 8 x 8 character box
- Assignment of up to 256K colors to 16 attributes
- 1 video memory page (0)
Screen 13 (VGA or MCGA)
- 320 x 200 graphics
- 40 x 25 text format, 8 x 8 character box
- Assignment of up to 256K colors to 256 attributes
- 1 video memory page (0) |
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[ Last edited by willsort on 2005-8-13 at 19:04 ]
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