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Diffstat (limited to 'usr.sbin/pcvt/Misc/Doc/Charsets')
| -rw-r--r-- | usr.sbin/pcvt/Misc/Doc/Charsets | 99 |
1 files changed, 0 insertions, 99 deletions
diff --git a/usr.sbin/pcvt/Misc/Doc/Charsets b/usr.sbin/pcvt/Misc/Doc/Charsets deleted file mode 100644 index b30dd8a..0000000 --- a/usr.sbin/pcvt/Misc/Doc/Charsets +++ /dev/null @@ -1,99 +0,0 @@ - -I. Character Set Selection on VT220 Terminals -================================================== - - -name C0 GL C1 GR - +---+ +-------------------+ +---+ +-------------------+ - |00h| | | |80h| | | -range | | | | 20h .. 7fh | | | | | a0h .. ffh | - |1fh| | | |9fh| | | - +---+ +-------------------+ +---+ +-------------------+ -length 32 96 32 96 - - /\ -SECOND /||\ "lock"- or "single"-shift one set of G0, G1, G2 or -STEP || G3 into one of the "displayable" charactersets GL - || or GR. (escape) sequences are: SI, SO, ESC ~, ESC n, - || ESC }, ESC o, ESC |, ESC N and ESC O. - - +----+ +----+ +----+ +----+ -name | G0 | | G1 | | G2 | | G3 | -length |(96)| |(96)| |(96)| |(96)| - +----+ +----+ +----+ +----+ - - /\ - /||\ designate a hard or a soft character set as - || one of G0, G1, G2 or G3, used escape sequences -FIRST || are, ESC ( X, ESC ) X, ESC * X and ESC + X - where X is -STEP || B for ascii, < for supplemental, 0 for special, A for - || british, 4 for dutch, C and 5 for finnish etc. etc. ... - || - - +-----+ +------------+ +--------+ +-----------+ +------------+ -name |ascii| |supplemental| |special | | national | |downloadable| - | | | graphics | |graphics| |replacement| |characterset| -length | (96)| | (96)| | (96)| | (96)| | (96)| - +-----+ +------------+ +--------+ +-----------+ +------------+ - - \-------\ /----------/ norway/danish - | dutch - together, this is also finnish - referred to as the french - multinational character french canada - set (power on default german - on a dec vt220) italian - spanish - swedish - swiss - - -II. Emulating Character Set Selection -========================================= - -MDA/HCG/CGA: - - just a partial emulation is done, because these boards don't allow - downloadable charactersets. some characters simply don't display - because they are not in the characterset roms on the video board. - - if you want to change the mapping, have a look at the default tables - in pcvt_tbl.h. - -EGA/VGA: - - these cards have provisions for downloadable charactersets and so - many vt220/vt320 charactersets are fully supported: - - - US Ascii - - DEC Supplemental - - DEC Special Graphic - - DEC Technical - - ISO Latin-1 - - Downloadable - - when the emulator is started, it behaves initially similar to - the MDA/CGA/HCG method described above. - - when a second (special) characterset for a given screen resolution - is loaded via the "loadfont" utility, the emulator detects this fact - and uses from then on extended tables to access the second charset - as an upper half 512 characterset in terms of ega/vga speak. - - from this time on, vt220 downloadable fonts are usable. - - the organization of this extended characterset is as follows: - - 0x00 ... 0x1f C0 display function fonts - 0x20 ... 0x3f C1 display function fonts - 0x40 ... 0x9f fonts for DEC Supplemental, DEC Special - Graphic, DEC Technical and ISO Latin-1 - 0xa0 ... 0xff VT220 Downloadable Font - - the mapping between vt220 charactersets and the charactersets inside - the ega/vga is done by tables found in the file pcvt_tbl.h. - - there is a MSDOS fonteditor called "EVAFONT" available on the - SIMTEL-20 archive, which i used to edit the character sets in the - distribution. - |
