From: "Simon Owen" <[EMAIL PROTECTED]> The original tests I did for SimCoup� showed ports &F8 to &FF always required ASIC attention, giving an extra 4 tstate penalty if not correctly aligned (even in the border area).
Yeah your Right! But there are still some oddities. In one case I tested when the NOP was outside my timing code a IN was 16 Ts and when the NOP was inside it the IN was 12 Ts. For the breakdown list used see: http://www.geocities.com/SiliconValley/Peaks/3938/z80ins.txt Thanks I use my Z80 Pocket book which also disribes the machine cicles . But this is a good supplement to it. >Building a definitive instruction timing list is difficult because it depends on so much! :-) It sure is ! Edwin
