Video I/O And Print Screen (Bi2Video); Video I/O And Print Screen (B12Video) - IBM PC CONVERTIBLE Technical Reference

Video I/O and Print Screen
(B12VIDEO)
0000 ROMCOOE SEGMENT BYTE PUBLIC
ASSUME CS: ROMCODE
IDENT BI2VIDEO,12,00
; ********************************************************************
,
MODULE-NAME: B12VIDEO
DATE LAST MODI FlED: 09(12(85
DESCRIPTIVE-NAME: VIDEO_IO AND PRINT SCREEN BIOS
COPYRIGHT: 7396-917 (C) COPYRIGHT IBM CORP. 1985
REFER TO COPYRIGHT INSTRUCTIONS FORM NUMBER G120-2083
CHANGE LEVEL: 0.0
FUNCTION: VIDEO_IO
PRINLSCREEN
MODULE SIZE: 2829 BYTES
ENTRY CONDITIONS:
HANDLES ALL BIOS VIDEO REQUESTS
HANDLES THE PRINT SCREEN FUNCTION
REFER TO ROUTINE PROLOGUES
EXIT CONDITIONS:
REFER TO ROUTINE PROLOGUES
ROUTINES IN MODULE:
VIDEO_IO
PRINLSCREEN
INT 10H DISPLAY INTERFACE ROUTINES
INT 5H PRINT SCREEN INTERRUPT HANDLER
INTERNAL DATA AREAS TABLES:
MLl, REGS_PUSHD, VI
EXTERNALLY REFERENCED ROUTINES: REFER TO EXTRN LIST
EXTERNALLY REFERENCED DATA AREAS: DATA SEG, XXDATA SEG, VIDEO RAM
CHANGE ACTIVITY: NONE
; ********************************************************************
; *****************************************************************
;* EXT ERN A L REF ERE N C E S
; *****************************************************************
ROUTINES
TABLES
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
EXTRN
DDS: NEAR
BEEP:NEAR
KB_NOISE:NEAR
GELRTLREG: NEAR
PULRTLREG:NEAR
LCDINIT:NEAR
CHAILGEN_LO: BYTE
CHAR_GEN_HI: BYTE
M4 :ABS
M5:WORD
M6:BYTE
M7: BYTE
ROM BIOS 2-77