The real world timeline is shown side by side with this alternate history (and marked with a gray background).
Chuck Peddle led a small team at MOS Technology to create the 6502 in 1975
A - Accumulator - 8 bits
Y - Index Register Y - 8 bits
X - Index Register X - 8 bits
PCH & PCL - Program Counter - 16 bits
00000001 S - Stack Pointer - 16 bits
data bus buffer -- second and third bytes of instruction, if used, routed to either ALU or PC
PCR - Processor Status register - 8 bits
N V I B D I Z C
N = Negative (1 = negative)
V = Overflow (1 = true)
I
B = Break Command (1 = break)
D = Decimal Mode (1 = true)
I = IRQ Disable (1 = disable)
Z = Zero (1 = true)
C = Carry (1 = true)