8bit-assembler

An assembler I made for my 8 bit computer

Instrucion set

ID	Opcode	VALUES	Hexcode	Description
0	NOP	0x00 0x00	0x00	No instruction
1	HLT	0x06 0x00	0x01	Halts the clock
2	MOV	0x81 0x00	0x02	Sets ram adress to Z
3	ARL	0x15 0x00	0x03	Loads from current Adress to A register
4	BRL	0x0D 0x00	0x04	Loads from current Adress to B register
5	LVA	0x11 0x00	0x05	Loads [Z] value to A register
6	LVB	0x09 0x00	0x06	Loads [Z] value to B register
7	ADD	0x12 0x00	0x07	Adds A register to B, stores in A
8	SUB	0x0A 0x01	0x08	Subs A register from B, stores in B
9	STORA	0x64 0x00	0x09	Stores value of A register in current adress
10	STORB	0x63 0x00	0x0A	Stores value of B register in current adress
11	RLV	0x61 0x00	0x0B	Stores value of argument in current adress
12	OUTA	0x04 0x02	0x0C	A Register -> Output Register
13	OUTB	0x03 0x02	0x0D	B Register -> Output Register
14	JMP	0x01 0x20	0x0E	Uncodnitional jump to [Z]
15	CMP	0x02 0x41	0x0F	Compares numbers in registers and sets flags
16	OUTAL	0x02 0x02	0x10	ALU -> Output Register
17	OUTR	0x05 0x02	0x11	Ram -> Output Register
18	OUTV	0x01 0x02	0x12	Rom argument to Output register
19	STORR	0x84 0x00	0x13	ALU -> Current Adress
20	CMPA	0x04 0x40	0x14	Compare numbers in register A with 0
21	CMPB	0x03 0x40	0x15	Compare numbers in register A with 0
22	JOF	0x01 0x28	0x16	Jump if overflow
23	JPO	0x01 0x18	0x17	Jump if positive
24	JNE	0x01 0x10	0x18	Jump if negative
25	JZE	0x01 0x08	0x19	Jump if zero
26	TAB	0x0C 0x00	0x1A	Transfers A to B
27	TBA	0x13 0x00	0x1B	Transfers B to A
28	JBT	0x01 0x18	0X1C	Jumps if button pressed

Opcode layout: |Opcode + ARG| = 2 bytes

Each opcode takes 2 bytes of memory, every instruction contains opcde in odd position and argument in even position

When running assembler.py, it will produce file program.bin from program.ebt