MODE 13
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 |