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.

The MODE 13 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.

'MODE 13'

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 13 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

• NewModes

References

-- Jgharston (talk) 13:04, 8 October 2016 (UTC)