Functions available for Writing to the Video Display

• Three different ways to write to the display

– Irvine library functions– DOS Video Functions (Interrupt 21h)– BIOS Video Functions (Interrupt 10h)

Irvine32 Library Video Function

• Clrscr

• Crlf

• DumpMem

• DumpRegs

• GotoXY

• SetTextColor

• WriteBin

• WriteChar

• WriteDec

• WriteHex

• WriteInt

• WriteString

DOS Video Functions (INT 21h)Place function number in ah before calling

INT21h

• 02- Display char in DL

• 06- Direct console I/O • If DL = FF, read a waiting character from standard

input• If DL = any other value, write the character in DL to

standard output.

• 09- Display string pointed to by DS:DX

BIOS Functions (INT 10h)Place function number in ah before calling

INT10h

• 00- Set video mode• 0F- Get current video mode• 02- Set Cursor Position• 03- Get Cursor Position• 05- Select video page• 06- Scroll window up• 07- Scroll window down• 08- Read char at current

cursor position

• 09- Display char and attribute at current position

• 0A- Display char-no attribute• 0E- Display char-advance

cursor• 0B- Set color palette• 0C-Write graphics pixel• 0D- Read graphics pixel

Where to Find the Details

• Irvine32 library functions– Table 5.1 (page 140 – details listed after table)– Slide with listings

• DOS Video Functions– Table C-2 (page 652)– Slides with listings

• BIOS Video Functions– Table C-3 (page 657)– Section 15.3 of Irvine book