ACT apricot - Page 12

CONTENTS
SECTION
3.S0FTWAR~ DETAIL
3-1 PROGRAMMERS GUIDE TO THE BIOS
INTRODUCTION ... .......... ... ........ ............... ........ ...... 1
BIOS Internal Structure - Memory Map .................. 1
VECTORS ................................................................... 3
POINTERS .................................................................. 3
CHARACTER FONTS 1, 2 and 3 .............................. 4
SECONDARY CACHE .............................................. 5
PRIMARYCACHE ..................................................... 5
SYSINIT ...................................................................... 5
BIOS CODE ................................................................. 5
BIOS CONSTANTS . .... ...... ....... ........ ...... ......... ...... .... 5
GLOBALDATAAREA .............................................. 6
BIOS HEAP AND STACK .......................................... 6
MS-DOS 2.00 .............................................................. 6
USERRAM ................................................................. 6
3-2 SCREEN DRIVER
INTRODUCTION .................... .............. ...... ......... .... 1
APPLICATIONS INTEREST .... ... .............................. 1
Escape
Sequence Management Functions ............. 1
Environment Flags ................................................. 8
ANSI Escape Sequences ................ ......................... 9
Physical Screen Layout ....................................... 12
Reverse Field Video .............................................
13
High/Low Intensity ............................................. 13
Underline ............................................................. 13
Strikethrough ...................................................... 13
Software Reserved .......................... ..................... 13
Character Font-cell ............................................. 14
SYSTEMS INTEREST ............................................. 15
CRTC Initialization ............................................ 15
Low-level Display routines ................................. 15
Cursor management routines ............................. 15
How a character appears on the screen ............... 16