PSEUDO ASSEMBLY LANG 1101 SPECIFICATION v1.5



It's character table (0-94):
 01234567
89ABCDEFG
HIJKLMNOP
QRSTUVWXY
Zabcdefgh
ijklmnopq
rstuvwxyz
!@#$%^&*(
)-=_+[]{}
;:'"\|,./
?<>
Whitespace is at the beginning (0) and new line is at the end (94)

The language consists of instructions constructed of combinations of 4 zeros and ones.

NOTE: a value is a number ranging from 0 to 65535 (65536 possible values). If a value overlaps 65535 it's set back to 0

0.SYNTAX
	Every character other than [0-1] is ignored. Each file has to have character count dividable by 4 after removing those others than 1's and 0's (since operators are 4 bits)

1.REGISTERS
Data is stored in 4 registers, each consisting of 16 cells (0-15), one value per cell.
There is one flag register, that holds one value, and cannot be modified directly.
	
	Registers are labeled as such:
	1000 - A reg
	1001 - B reg
	1010 - C reg
	1011 - D reg
	1100 - Flag - impossible to increment/decrement, can only be set by internal functions.
	
	Default register is A register.
	
	NOTE: theese can and will overlap with instructions.

2.LOOPS AND STATEMENTS
	A loop is repeated until a value in the cell is equal to 0
	A statement is executed if a flag register is set to 1.
	
	A loop starts with instruction 1010 - STARTLOOP
	A statement starts with instruction 1110 - STARTSTAT
	Both end with instruction 1011 - ENDLS
	
	NOTE: The interpreter should scan for the nearest ENDLS instruction after the STARTLOOP or STARTSTAT, none else => nested statements and loops are NOT supported.

3.VALUE TESTS
	Each of the instruction takes one parameter - cell address in current register.
	0101- IF:
		It checks if the value in cell at current cell pointer is equal to the value in the cell specified.
		If the values are equal, the flag register is set to 1. otherwise it is set to 0.
	
	0110 - IFNOT:
		It checks if the value in cell at current cell pointer is NOT equal to the value in the cell specified.
		If the values are NOT equal, the flag register is set to 1. otherwise it is set to 0.
	
4.USER INPUT
	Every character other than 0-9] is ignored. Input is treated as a number.
	E.g. if a user inputs 18, when the program outputs this value it will output the letter 'G' (as stated in character table)
	
5. INSTRUCTIONS
1.	0000 - SOF - (Start Of File) every program has to start with this
2.	1111 - EOF - end of program file.

3.	0001 - INCREMENT - Increment value at current cell pointer by 1
4.	0010 - DECREMENT - Decrease value at current cell pointer by 1
	
5.	0100 [register] - SWITCH - Switches the register to specified.
	
6.	1001 - INCRCELLP - increases cell pointer 
7.	1000 - DECRCELLP - decreases cell pointer
	
8.	0011 - OUTPUT - output value to screen
9.	0111 - INPUT - request user input
	
10.	1010 - STARTLOOP - start loop
11. 1110 - STARTSTAT - start statement
12.	1011 - ENDLS - end loop/statement

13. 0101 [cell B] - IF - Refer to part 3 of documentation.
14. 0110 [cell B] - IFNOT - Refer to part 3 of documentation.

15. 1101 [register] [cell] - COPY - Copies value from pointed cell to cell at current cell pointer

16. 1100 - CLR - clears cell at cell pointer

5a.INSTRUCTION PARAMETERS
	Some instructions can take parameters. For instance - 1101 - COPY.
	The first parameter is a register taken from register list (refer to part 1 of documentation)
	The second one is cell address in the register specified. It is formatted as a binary number ranging from 0-15.
	
	
6.EXAMPLE CODE
	a)This code displays user's input 10 times
	0000

	1001
	0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 
	1000
	0111

	1001

	1010
	1000
	0011
	1001
	0010
	1011

	1111

	
	alternatively, for a word interpreter:
	SOF

	INCRCELLP
	INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT INCREMENT 
	DECRCELLP
	INPUT

	INCRCELLP

	STARTLOOP
	DECRCELLP
	OUTPUT
	INCRCELLP
	DECREMENT
	ENDLS

	EOF
	
	b)Simple Hello world.
	0000 
	0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001
	0011
	0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001
	0011
	0001 0001 0001 0001 0001 0001 0001
	0011
	0011
	0001 0001 0001
	0011
	
	1100
	0011
	
	0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001
	0011
	0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001 0001
	0011
	0001 0001 0001
	0011
	0010 0010 0010 0010 0010 0010
	0011
	0010 0010 0010 0010 0010 0010 0010 0010
	0011
	1111