Actually better, the Z8530 is speed rated to 4MHz, the Z8530A 6MHz, there is a Z8530A-8 rated to 8MHz. So far I have found these chips seem to all work in 8-10MHz Z80 clock range of our CPU boards, but definitely A’s would be better. John From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of Joe Herdler Hi, I am currently putting together my S-100 serial board (V3), and am in the process of sourcing the ICs. I cannot seem to be able to find a Z8530 but have seen many Z8530As out there. Would it be acceptable to use the Z8530A for this board? Thank you much! Best, Joe Herdler -- |