1. 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)

2. Irvine32 Library Video Function Clrscr Crlf DumpMem DumpRegs GotoXY SetTextColor WriteBin WriteChar WriteDec WriteHex WriteInt WriteString

3. 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

4. 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

5. 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