Difference between revisions of "MODE 14"
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[[Image:MODE 14 (BBC) demonstration.gif|right|Demonstration of 'MODE 14' (BBC)]] | [[Image:MODE 14 (BBC) demonstration.gif|right|Demonstration of 'MODE 14' (BBC)]] | ||
'''MODE 14''' is the unofficial title of a low-resolution screen [[MODE]], | '''MODE 14''' is the unofficial title of a low-resolution screen [[MODE]], | ||
| − | selectable with the *MODE command or the NewModes sideways ROM module.<ref | + | selectable with the '''*MODE''' command or the NewModes sideways ROM module.<ref |
name="newmodes">[http://mdfs.net/Apps/Graphics/NewModes/ NewModes]</ref> | name="newmodes">[http://mdfs.net/Apps/Graphics/NewModes/ NewModes]</ref> | ||
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of MODE 6, 40 × 25 characters in 4 colours. It does this by redefining | of MODE 6, 40 × 25 characters in 4 colours. It does this by redefining | ||
the character set to provide thin characters. | the character set to provide thin characters. | ||
| − | + | <br><br><br><br><br><br><br><br><br> | |
{| class="wikitable" style="text-align:left" | {| class="wikitable" style="text-align:left" | ||
|+'MODE 14' | |+'MODE 14' | ||
| Line 77: | Line 77: | ||
?&360=3 :REM Number of colours | ?&360=3 :REM Number of colours | ||
VDU 20 :REM Reset palette | VDU 20 :REM Reset palette | ||
| − | *FX154, | + | *FX154,132 |
6502: | 6502: | ||
LDA #22:JSR OSWRCH | LDA #22:JSR OSWRCH | ||
| − | LDA #05:JSR OSWRCH | + | LDA #05:JSR OSWRCH \ Base MODE |
| − | LDA #&27:STA &30A | + | LDA #&27:STA &30A \ Characters per line |
| − | LDA #&08:STA &34F | + | LDA #&08:STA &34F \ Byte per character |
| − | LDA #&03:STA &360 | + | LDA #&03:STA &360 \ Number of colours |
| − | LDA #20:JSR OSWRCH | + | LDA #20:JSR OSWRCH \ Reset palette |
| − | LDA #154:LDX # | + | LDA #154:LDX #132:JSR OSBYTE \ Cursor width |
The character set needs to be redefined to be four pixels wide, such as with | The character set needs to be redefined to be four pixels wide, such as with | ||
Latest revision as of 02:30, 20 January 2023
_demonstration.gif)
MODE 14 is the unofficial title of a low-resolution screen MODE, selectable with the *MODE command or the NewModes sideways ROM module.[1]
The MODE 14 code adapts the MODE 6 screen to provide a 4-colour version
of MODE 6, 40 × 25 characters in 4 colours. It does this by redefining
the character set to provide thin characters.
| Type | Bitmapped | |
| Resolution | Text | 40 × 25 characters |
| Graphics | text only | |
| Character size | 4 × 8 pixels | |
| Pixel aspect | 1:1 (square) | |
| Bits per pixel | 2 | |
| Default palette | Logical colour | Actual colour |
|---|---|---|
| 0 | 0 (black) | |
| 1 | 1 (red) | |
| 2 | 3 (yellow) | |
| 3 | 7 (white) | |
| Memory | allocated | 8192 bytes |
| on screen | 8000 bytes | |
| Address range | Model B etc. | &6000..&7FFF |
| Configuration | Video ULA control register | &44 |
| Video ULA palette register file | &07 &17 &26 &36 &47 &57 &66 &76 &84 &94 &A0 &B0 &C4 &D4 &E0 &F0 | |
| CRTC register file | &3F &28 &31 &24 &26 &00 &20 &22 &01 &07 &67 &08 | |
MODE 14 can be created manually with the following code running in the I/O processor.
BASIC: MODE 6 :REM Base MODE ?&30A=39 :REM Characters per line ?&34F=8 :REM Bytes per character ?&360=3 :REM Number of colours VDU 20 :REM Reset palette *FX154,132 6502: LDA #22:JSR OSWRCH LDA #05:JSR OSWRCH \ Base MODE LDA #&27:STA &30A \ Characters per line LDA #&08:STA &34F \ Byte per character LDA #&03:STA &360 \ Number of colours LDA #20:JSR OSWRCH \ Reset palette LDA #154:LDX #132:JSR OSBYTE \ Cursor width
The character set needs to be redefined to be four pixels wide, such as with the one used with NewModes.
See Also
References
| Screen display MODEs |
|---|
|
MODE 0 | MODE 1 | MODE 2 | MODE 3 | MODE 4 | MODE 5 | MODE 6 | MODE 7 |
