8 bit CPU emulator

8 bit cpu emulator written in C using a custom instruction set with an assembler that assembles my custom assembly language.

Assembler

The assembler supports the custom assembly language I have created, the assembly language includes 16 base Instructions as well as Macros that are expanded with a preprocessor I have designed, You can define bytes, strings and labels which all get evaluated by the assembler, the dir asm holds examples of this assembly language.

Opcodes

0x0 MR reg, reg/8bit
0x1 LR reg, HL/16bit       load byte
0x2 WR reg, HL/16bit        write byte
0x3 ADD reg, reg/8bit
0x4 ADC reg, reg/8bit + c flag    resets c flag
0x5 SUB reg, reg/8bit
0x6 SBB reg, reg/8bit + b flag    resets b flag
0x7 JCN 4bitflag flag HL/Adress 1 bit, 001 = L 010 = C 011 100 = B, HL/16bit
0x8 CMP reg, reg/bit
0x9 PUSH reg/8bit      
0xa POP reg
0xb AND reg, 8bit/reg
0xc OR reg, 8bit/reg
0xd NOR reg, 8bit/reg
0xe INB reg, PORT
0xf OUTB reg, 8bit/reg

Register

SP 16bit
PC 16bit
IR 8bit

A 8bit
B 8bit
C 8bit
D 8bit
F 8 bit

Flags

LESS
EQUAL
CARRY
BORROW