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==================================================================
         MikeOS -- The Mike Operating System kernel
              SCREEN HANDLING SYSTEM CALLS
==================================================================

os_print_string

Displays text

• IN: SI = message location (zero-terminated string)
• OUT: Nothing (registers preserved)

Example:

code here

os_clear_screen

Clears the screen to background

• IN/OUT: Nothing (registers preserved)

Example:

code here

os_move_cursor

Moves cursor in text mode

• IN: DH, DL = row, column
• OUT: Nothing (registers preserved)

Example:

code here

os_get_cursor_pos

Return position of text cursor

• OUT: DH, DL = row, column

Example:

code here

os_print_horiz_line

Draw a horizontal line on the screen

• IN: AX = line type (1 for double, otherwise single)
• OUT: Nothing (registers preserved)

Example:

code here

os_show_cursor

Turns on cursor in text mode

• IN/OUT: Nothing

Example:

code here

os_hide_cursor

Turns off cursor in text mode

• IN/OUT: Nothing

Example:

code here

os_draw_block

Render block of specified colour

• IN: BL/DL/DH/SI/DI = colour/start X pos/start Y pos/width/finish Y pos
• OUT: Nothing

Example:

code here

os_file_selector

Show a file selection dialog

• IN: Nothing
• OUT: AX = location of filename string (or carry set if Esc pressed)

Example:

code here

os_list_dialog

Show a dialog with a list of options

• IN: AX = comma-separated list of strings to show (zero-terminated),
• BX = first help string, CX = second help string
• OUT: AX = number (starts from 1) of entry selected carry set if Esc pressed

Example:

code here

os_draw_background

Clear screen with white top and bottom bars,containing text, and a coloured middle section.

• IN: AX/BX = top/bottom string locations, CX = colour
• OUT: Nothing

Example:

code here

os_print_newline

Reset cursor to start of next line

• IN/OUT: Nothing (registers preserved)

Example:

code here

os_dump_registers

Displays register contents in hex on the screen

• IN/OUT: AX/BX/CX/DX = registers to show

Example:

code here

os_input_dialog

Get text string from user via a dialog box

• IN: AX = string location, BX = message to show
• OUT: AX = string location

Example:

code here

os_dialog_box

Print dialog box in middle of screen, with button(s)

• IN: AX, BX, CX = string locations (set registers to 0 for no display)
• IN: DX = 0 for single 'OK' dialog, 1 for two-button 'OK' and 'Cancel'
• OUT: If two-button mode, AX = 0 for OK and 1 for cancel
• NOTE: Each string is limited to 40 characters

Example:

code here

os_print_space

Print a space to the screen

• IN/OUT: nothing

Example:

code here

os_dump_string

Dump string as hex bytes and printable characters

• IN: SI = points to string to dump
• OUT: Nothing

Example:

code here

os_print_digit

Displays contents of AX as a single digit

Works up to base 37, ie digits 0-Z
• IN: AX = "digit" to format and print
• OUT: Nothing

Example:

code here

os_print_1hex

Displays low nibble of AL in hex format

• IN: AL = number to format and print
• OUT: Nothing

Example:

code here

os_print_2hex

Displays AL in hex format

• IN: AL = number to format and print
• OUT: Nothing

Example:

code here

os_print_4hex

Displays AX in hex format

• IN: AX = number to format and print
• OUT: Nothing

Example:

code here

os_input_string

Take string from keyboard entry

• IN/OUT: AX = location of string, other regs preserved
• (Location will contain up to 255 characters, zero-terminated)

Example:

code here