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On Thu, 10 Oct 1996, Michael Redmond wrote: > It seems UNBELIEVABLE...but indeed the jumpering is EXACTLY > OPPOSITE...jumper in place from 47 to 48 to get MASTER on the DHAA, and in > place from 47 to 48 to get SLAVE on the DCRA. Talk about the total opposite > to compatibility...go figure!! Does IBM want to make sure we buy new systems > for their new drives or what? I must be missing something here. I too had this problem, when goint from 340 to 810 MB in my 750C. The 810 was also IBM, but the wrong "type" regarding jumper settings. Using a fine tip soldering iron, I lifted the connector lead for pin 47 or 48 (I forget which, either one is OK) from the pc board on the drive. You have to remove the PCB to get at this, but it wasn't hard. the other option would be to simply clip the pin on the connector, but that's pretty irreversible. If you use the method I described, the drive can always be restored to the original configuration. best regards, harry seaman