85 lines
2.3 KiB
NASM
85 lines
2.3 KiB
NASM
; 0x00 -> print register a as char
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; 0x01 -> print register a as int
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;
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; 0xFF -> Halt
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; 0xFE -> Error Interupt
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; 0xF6 -> put keycode of currently pressed key in A register
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; and but a value (bool)(0 or 1) into b register to
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; indicate whether it is the first time this key has been
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; pressed.
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;
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;
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; 0x70 -> Init graphics,
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; (A) mode
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; (B) X resolution
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; (C) Y Resulution
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; 0x71 -> Set Pixel, (bitmap mode)
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; (A) Color (0x000000 to 0xFFFFFF)
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; (B) x position
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; (C) y position
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; 0x72 -> Set Char, (Text Mode)
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; (A) Character Code
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; (B) Cursor Position
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; (C) Color (0x000000 to 0xFFFFFF)
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;
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;
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; ! ALLL FILESYSTEM DRIVE NUMBER ARE LOCAL FILES !
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; drive( drive number (0 to 9)).bin
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; "drive8.bin"
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;
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; drive number -> ( 0 to 9 )
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; sector number -> ( 0 to 15 )
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; byte offset -> ( 0 to 254 )
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;
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; 0x80 -> read byte from disk
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; (A) drive number
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; (B) sector number
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; (C) byte offset
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; moves output to A register
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; 0x81 -> write byte from disk
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; (A) drive number
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; (B) sector number
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; (C) byte offset
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; (D) byte to write
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main:
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ldw a, 0xFF ; load 255 to A register, Unused
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str a, 0xEF ; will cause an error because its writing to program memory
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; You will have to make the address bigger than the program
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int 0x00 ; interupt to print a register to terminal as a char (debug)
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ldw a, 0 ; will be the graphics mode
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str a, 0xF0 ; copy A register to memory address
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ldw a, 800 ; screen width
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str a, 0xF1 ; copy A register to memory address
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ldw a, 600 ; screen height
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str a, 0xF2 ; copy A register to memory address
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jsr init_graphics_mode
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init_graphics_mode:
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push a
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push b
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push c
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ldw a, 0xFF ; This is never used
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ldr a, 0xF0 ; copy data from memory address to register 'A'
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ldr b, 0xF1 ; copy data from memory address to register 'B'
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ldr c, 0xF2 ; copy data from memory address to register 'C'
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int 0x70 ; all interupts in 0x70 - 0x7F are for graphics,
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; only 0x70 to 0x72 are implemented
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pop c
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pop b
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pop a
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ret
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