MODE 12
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MODE 12 is the unofficial title of a low-resolution screen MODE, selectable with the *MODE command or the NewModes sideways ROM module.[1]
The MODE 12 code adapts the MODE 5 screen to provide a small-memory
version of MODE 1, 40 × 32 characters in 4 colours. It does this by
redefining the character set to provide thin characters.
| Type | Bitmapped | |
| Resolution | Text | 40 × 32 characters |
| Graphics | 160 × 256 | |
| Character size | 4 × 8 pixels | |
| Pixel aspect | 2:1 (wide) | |
| Bits per pixel | 2 | |
| Default palette | Logical colour | Actual colour |
|---|---|---|
| 0 | 0 (black) | |
| 1 | 1 (red) | |
| 2 | 3 (yellow) | |
| 3 | 7 (white) | |
| Memory | allocated | 10240 bytes |
| on screen | 10240 bytes | |
| Address range | Model B etc. | &5800..&7FFF |
| Configuration | Video ULA control register | &84 |
| 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 12 can be created manually with the following code running in the I/O processor.
BASIC: MODE 5 :REM Base MODE ?&30A=39 :REM Characters per line ?&34F=8 :REM Bytes per character *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 #154:LDX #84: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 |
