IBM "Type 0667" ESDI disk information?

Apparently the 70 MB Esdi drive is also called an E70? I found the following at http://www.uni-giessen.de/faq/archiv/ibm-rt-faq.hardware/msg00000.html * The E70 and E114 hard drives use a 150 Ohm inline resistor. It has pin one as the common pin, and has 12 total leads. This is NOT documented ANYWHERE that I could find! * Switch settings for E70 and E114 hard drives. For RT installation, the switches must be as follows: 1 2 3 4 5 6 +------------------+ On | X X X | Off | X X X | +------------------+ - Eliot <eliot at engr.washington.edu> reports that the switch meanings are: switch 1: on = pwr up via software (factory default) off = pwr up with system 2: on = diags (factory default) off = ? [ My guess.. since on is the RT normal position, then off must activate diagnostic mode. - MW] 3: on = 512 byte sectors (factory default) off = 256 byte sectors 4,5,6: drive select in binary i.e. 4 off 5 on 6 off = drive select 2