Actually, it's 7. The problem is that t-states aren't totally accurate for counting cycles. > Yes, but a 6502 has fast access to zero page, and much better > facilities for accessing memory. The Z80 is clocked at 6Mhz, but > the simplest instruction takes 4 clocks and many take many more, > whereas the most complex 6502 instructions are (I think) 8 cycles.