On Sat, Sep 30, 2017 at 6:32 AM, Chuck Guzis via cctalk <cctalk@classiccmp.org> wrote:
> Still a few too many read errors for my taste, so this weekend is going > to be a session with a 'scope and alignment tape. I think I've got a > way to adjust skew--just hook a logic analyzer probe to each channel and > set the LA to trigger on state changes. The HP box I'm using is good > to about 25 nsec. One of my tape drives has a set of equal-value resistors connected to each of the read channels, the others ends of the resistors being brought out to a testpoint. You connect a 'scope there and read a skewmaster tape. The idea is that if the read transitions all occur at the same time (no skew) you get a pefect step on the 'scope, if some are later than others you get a staircase. You adjust the heads for the smallest width of the stairs. -tony
