Interruption 21h - Generic DOS - WIP
INT 0x21 - 0x00 - Program Terminate
INT 0x21 - 0x09 - print String
INT 0x21 - 0x25 - Set Interrupt Vector
INT 0x21 - 0x30 - Get DOS version (DOS 2+)
INT 0x21 - 0x34 - Get Address to DOS Critical Flag
INT 0x21 - 0x35 - Get Interrupt Vector
INT 0x21 - 0x3d - Open File or Device Using Handle
INT 0x21 - 0x3e - Read Close File or Device Using Handle
INT 0x21 - 0x3f - Read From File or Device Using Handle
INT 0x21 - 0x40 - Write To File or Device Using Handle
INT 0x21 - 0x48 - Allocate Memory
INT 0x21 - 0x4a - DOS 2+ - Resize Memory Block
INT 0x21 - 0x4b - DOS 2+ - "EXEC" - Load and/or Execute Program
INT 0x21 - 0x4c - DOS 2+ - "EXIT" - Terminate with return Code
INT 0x21 - 0x50 - Set Current Process ID
INT 0x21 - 0x51 - Get Current Process ID
INT 0x21 - 0x58 - Get/Set Memory Allocation Strategy
INT 0x21 - 0x59 - DOS 3.0+ - Get Extended Error Information
INT 0x21 - 0x62 - DOS 3.x - Get PSP address
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