64 instruction thing

-------- REGISTERS --------
A - accumulator, 8-bit
X - index, 8-bit
Y - index, 8-bit
SP - stack pointer
PC - program counter
F - flags: carry, negative, zero

-------- OPCODE FORMAT --------
ffffff00                   - zero
ffffff01 nnnnnnnn          - zeropage (or immediate)
ffffff10 nnnnnnnn nnnnnnnn - absolute
ffffff11 nnnnnnnn nnnnnnnn - absolute,x

Before an opcode is excuted, the bottom two bits are looked at to determine how many bytes to read,
and this is put into a buffer. This buffer may be interpreted by the instruction as a constant value or a memory address.
Branch opcodes interpret 8-bit values as relative, and 16-bit values as absolute.
The "zero" addressing mode gives easy access to the first byte of memory.

f = function, from list below:

-------- FUNCTION TABLE --------
Load/Store/Transfer
00 LDA constant
01 LDA memory
02 LDX constant
03 LDX memory
04 STA memory
05 STX memory
06 TAX
07 TXA

Add/Subtract
08 SUB constant
09 SUB memory
0A ADD constant
0B ADD memory
0C SBC constant
0D SBC memory
0E ADC constant
0F ADC memory

Bit math
10 NOR constant
11 NOR memory
12 XOR constant
13 XOR memory

Comparisons
14 CMP constant
15 CMP memory
16 CPX constant
17 CPX memory

Bit shifts
18 ASL
19 LSR
1A ROL memory
1B ROR memory

Y register
1C LDY constant
1D LDY memory
1E CPY constant
1F STY memory
20 INY
21 DEY
22 PHY
23 PLY
24 LDA memory+y   \ absolute
25 STA memory+y   /
24 LDA (memory)+y \ zeropage, indirect
25 STA (memory)+y /

26 Unassigned
27 Unassigned

Miscellaneous
28 PHP
29 PLP
2A SWAP (A and X)
2B RTS
2C SEC
2D CLC

Increment/decrement
2E INC memory
2F DEC memory
30 INC
31 DEC
32 INX
33 DEX

Push/pull
34 PHA
35 PHX
36 PLA
37 PLX

Branches
38 BRA \ zeropage
39 BSR |
3A BPL |
3B BMI |
3C BNE |
3D BEQ |
3E BCC |
3F BCS /

Jumps
38 JMP \ absolute
39 JSR |
3A JPL |
3B JMI |
3C JNE |
3D JEQ |
3E JCC |
3F JCS /

-------- ALIASES/NOTES --------

NOT = NOR
ORA = NOR whatever, NOT
BIC = NOT, NOR #whatever
AND = NOT, NOR #255^whatever
NEG = NOT, INC

TAY = PHA, PLY
TYA = PHY, PLA
TXY = PHX, PLY
TYX = PHY, PLX

---

could replace CLC/SEC with ADD/SUB but it would mess up zero flag and sign flag
A can be reset to zero in just one opcode with LDA

do we really need a nop?

you can do "LDA A,X,Y" if you're a weirdo