Thanks for the help. I found the two fles you mentioned. I am looking at the table of instructions and what flags they affect and how in the z80href.txt file. But next to many of the instructions under the parity flag there is a "V" and the file does not say what that means (it just says what -,*,0,1, and ? mean) Do you know what the "V" means? If so, please tell me. Thanks.