Difference between revisions of "MODE 13"
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[[Image:MODE 13 (BBC) demonstration.gif|right|Demonstration of 'MODE 13' (BBC)]] | [[Image:MODE 13 (BBC) demonstration.gif|right|Demonstration of 'MODE 13' (BBC)]] | ||
'''MODE 13''' is the unofficial title of a low-resolution screen [[MODE]], | '''MODE 13''' 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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version of MODE 2, 20 × 32 characters in 16 colours. It does this by | version of MODE 2, 20 × 32 characters in 16 colours. It does this by | ||
redefining the character set to provide thin characters. | redefining the character set to provide thin characters. | ||
| − | + | <br><br><br><br><br><br><br><br><br><br> | |
{| class="wikitable" style="text-align:left" | {| class="wikitable" style="text-align:left" | ||
|+'MODE 13' | |+'MODE 13' | ||
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|- style="vertical-align:top" | |- style="vertical-align:top" | ||
| Pixel aspect | | Pixel aspect | ||
| − | | colspan="2" | | + | | colspan="2" | 4:1 (ultra wide) |
|- style="vertical-align:top" | |- style="vertical-align:top" | ||
| Bits per pixel | | Bits per pixel | ||
Latest revision as of 02:29, 20 January 2023
_demonstration.gif)
MODE 13 is the unofficial title of a low-resolution screen MODE, selectable with the *MODE command or the NewModes sideways ROM module.[1]
The MODE 13 code adapts the MODE 5 screen to provide a small-memory
version of MODE 2, 20 × 32 characters in 16 colours. It does this by
redefining the character set to provide thin characters.
| Type | Bitmapped | |
| Resolution | Text | 20 × 32 characters |
| Graphics | 80 × 256 | |
| Character size | 4 × 8 pixels | |
| Pixel aspect | 4:1 (ultra wide) | |
| Bits per pixel | 4 | |
| Default palette | Logical colour | Actual colour |
|---|---|---|
| 0 | 0 (black) | |
| 1 | 1 (red) | |
| 2 | 2 (green) | |
| 3 | 3 (yellow) | |
| 4 | 4 (blue) | |
| 5 | 5 (magenta) | |
| 6 | 6 (cyan) | |
| 7 | 7 (white) | |
| 8 | 8 (flashing black/white) | |
| 9 | 9 (flashing red/cyan) | |
| 10 | 10 (flashing green/magenta) | |
| 11 | 11 (flashing yellow/blue) | |
| 12 | 12 (flashing blue/yellow) | |
| 13 | 13 (flashing magenta/green) | |
| 14 | 14 (flashing cyan/red) | |
| 15 | 15 (flashing white/black) | |
| Memory | allocated | 10240 bytes |
| on screen | 10240 bytes | |
| Address range | Model B etc. | &5800..&7FFF |
| Configuration | Video ULA control register | &C0 |
| Video ULA palette register file | &07 &16 &25 &34 &43 &52 &61 &70 &8F &9E &AD &BC &CB &DA &E9 &F8 | |
| CRTC register file | &3F &28 &31 &24 &26 &00 &20 &22 &01 &07 &67 &08 (from table in MOS 1.20 at &C486..&C491) | |
MODE 13 can be created manually with the following code running in the I/O processor.
BASIC: MODE 5 :REM Base MODE ?&30A=19 :REM Characters per line ?&34F=16 :REM Bytes per character ?&361=1 :REM Pixels per byte ?&362=&AA :REM Pixel left mask ?&363=&55 :REM Pixel right mask *FX154,192 6502: LDA #22:JSR OSWRCH LDA #05:JSR OSWRCH \ Base MODE LDA #&13:STA &30A \ Characters per line LDA #&10:STA &34F \ Byte per character LDA #&01:STA &361 \ Pixels per byte LDA #&AA:STA &362 \ Pixel left mask LDA #&55:STA &363 \ Pixel right mask LDA #154:LDX #192: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 |
