Plasma Fri Nov 16 2007 at 12:08 am
int 10h, ax=1100h
Is the easiest way, and fine for most uses. (See http://www.ctyme.com/intr/rb-0136.htm) Example from LoadCP:
' Set the new font
Regs.ax = &H1100
Regs.es = VARSEG(Font$)
Regs.bp = SADD(Font$)
Regs.cx = 256
Regs.dx = 0
Regs.bx = FontHeight * &H100
InterruptX &H10, Regs, Regs
If you're changing the font continuously this will cause flicker though. In that case you'll have to monkey a bit with some VGA regs and poke the font in at A000h. Here's some code from TextMouse that does that:
SUB Text.FontApply (StartChar, EndChar)
'=========================================================================
' Updates the DOS font with the characters (StartChar to EndChar) in
' the currently loaded font.
'-------------------------------------------------------------------------
' Parameters: StartChar = Starting character to update (0 to 255)
' EndChar = Ending character to update (0 to 255)
'=========================================================================
OUT &H3CE, 5
OldMode = INP(&H3CF)
OUT &H3CF, OldMode AND &HFC
OUT &H3CE, 6
OldMisc = INP(&H3CF)
OUT &H3CF, (OldMisc AND &HF1) OR 4
OUT &H3C4, 2
OldMask = INP(&H3C5)
OUT &H3C5, 4
OUT &H3C4, 4
OldMem = INP(&H3C5)
OUT &H3C5, OldMem OR 4
DEF SEG = &HA000
FOR Char = StartChar TO EndChar
FOR Row = 0 TO Text.CharRes - 1
Byte = ASC(MID$(Text.FontBuffer$, Char * Text.CharRes + Row + 1, 1))
POKE Char * 32 + Row, Byte
NEXT
NEXT
OUT &H3CE, 5
OUT &H3CF, OldMode
OUT &H3CE, 6
OUT &H3CF, OldMisc
OUT &H3C4, 2
OUT &H3C5, OldMask
OUT &H3C4, 4
OUT &H3C5, OldMem
END SUB
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