Hi Were there any 5.25 drive made with sector pulse output? I'm working on a controller for my Polymorphic. I have not software to run the board so I'm decoding the Z80 code that runs in its firmware. I see that one of the signals from the drive is the sector signal. I know that the SA801 could be configured for 32/16/8 sectors and produce a sector output signal. In any case, the code seems to be looking for the sector signal at one point. The next question is, do the older drives have a filter on them such that they would not output the index along with the sector pulse? The drive I'm planning on using is an old Qume drive with a IBM lable on the front. It is a QUMETRAK 142. It is good to work on because it is all descrete parts and TTL ( some analog IC's as well ). Still, if they have a filter on the index, I should be able to modify it. I only see one pot in that area of the board and I suspect that it is for the pulse witdh of the index. If there is no filter, I should be able to make an external sector separator. Dwight _________________________________________________________________ i?m is proud to present Cause Effect, a series about real people making a difference. http://im.live.com/Messenger/IM/MTV/?source=text_Cause_Effect