8 Bit Computer with its own OS
Each command consists of 4 bits for an op code and 8 bits for instructions [op code][instructions]
Labels are 10 bits long and store a index in the code to jump to
Colors are 24 bits long and store a color to display to the screen
There are 4 registers: register 1, 2, 3, and 4
Commands:
The order arguments are presented in is the order they should appear, moving from most significant to least significant bit
ALU:
- OP CODE 0
- takes 3 arguments [AA][BB][CODE]
> Register A (2 bits)
> Register B (2 bits)
> ALU OP CODE (4 bits)
0) C = A + B
1) C = A - B
2) C = A * B
3) C = A // B
4) C = A % B
5) C = A & B
6) C = A | B
7) C = A ^ B
8) C = ~A
9) C = -A
10) C = A = B
11) C = A != B
12) C = A >= B
13) C = A > B
14) C = A <= B
15) C = A < B
- OP CODEs 10 through 15 are either 0 or 1
- C is stored in register 0
SET:
- OP CODE 1
- takes 1 argument [NEWVALUE]
> Value (8 bits)
- sets register 0 to Value
DUPLICATE:
- OP CODE 2
- takes 2 arguments [AA][BB][xxxx]
> Register A (2 bits)
> Register B (2 bits)
- sets Register B to Register A
READ:
- OP CODE 3
- takes 1 argument [RADDRESS]
> Read Address (8 bits)
- Reads RAM address Address and stores it in Register 1
WRITE:
- OP CODE 4
- takes 1 argument [WADDRESS]
> Write Address (8 bits)
- Stores Register 1 in RAM address Address
MARK:
- OP CODE 5
- takes 1 argument [LADDRESS]
> Label Address (8 bits)
- Stores Label address Address in Label Storage
JUMP:
- OP CODE 6
- takes the same arguments as ALU
- if C is not 0, then move pointer to Value in Label Storage
- Otherwise, do nothing
7 SEGMENT DISPLAY:
- OP CODE 9
- takes 2 arguments: [RE][x][S][xxxx]
> Register (2 bits)
> Segment (1 bit)
- there is 1 ignored bit in-between Register and Segment
- Sets 7 Segment Display Segment to value in first 4 bits of Register (will break if over 10)
DRAW:
- OP CODE 10
- Takes 3 arguments: [XX][YY][COLR]
> X Register (2 bits)
> Y Register (2 bits)
> Color Address (4 bits)
- Sets pixel at (X, Y) to Colors address Address
BULB:
- OP CODE 11
- Takes 2 arguments: [B][x][CL][xxxx]
> Bulb (1 bit)
> Color (2 bits)
- Sets Bulb Bulb to No Color (color 0), Red (color 1), or Green (color 2)
INPUT:
- OP CODE 12
- Takes 0 arguments: [xxxxxxxx]
- Sets Register 0 to the button input values (button x sets bit x - 1 to true if pressed, bit 0 is least significant bit, only 1 button can be pressed at a time)
END:
- OP CODE 13
- Takes 0 arguments: [xxxxxxxx]
- Terminates the program, reset button must be pressed to re-enable
WAIT:
- OP CODE 14
- Takes 0 arguments: [xxxxxxxx]
- Does Nothing, any jumps should point to a WAIT to ensure that commands are not skipped unintentionally
