80 MB Smartdrive (250-4120)        Settings            Faxback Doc. # 3085

When only "1" Drive is installed.

JUMPER      SETTING             FUNCTION
J11         not jumpered        Factory Setting
J13         not jumpered        Factory Setting
J14         SEE NOTE "A"
J15         not jumpered        Factory Setting
J16         not jumpered        Factory Setting
J17         jumpered            Selects 80/40MB (jumpered is 80MB)
J18         jumpered            Selects 4/7 bytes ECC used                      

                       (jumper on is 4 bytes)
J19         jumpered            Drive Select
J20         jumpered            Drive Select

NOTE A:  Install J14 if DRIVE TYPE "35" is going to be used.  Remove J14 if 
DRIVE TYPE "28" is going to be used.

When 2 drives are used as a master and slave.

MASTER                  SLAVE
J11     no jumper       J11         no jumper
J13     no jumper       J13         no jumper
J14     SEE NOTE "A"    J14         SEE NOTE "A"
J15     no jumper       J15         no jumper
J16     no jumper       J16         no jumper
J17     jumpered        J17         jumpered
J18     jumpered        J18         jumpered
J19     not jumpered    J19         jumpered
J20     jumpered        J20         no jumper

NOTE A:  Install J14 if DRIVE TYPE "35" is going to be used.  Remove J14 if 
DRIVE TYPE "28" is going to be used.

NOTE B:  J11, J13, J15, and J16 are factory settings and SHOULD BE
LEFT ALONE.

The Smartdrive jumper pins J11, J13-J20, use micro-jumpers.  Normal size 
jumpers will NOT work, though they appear to fit properly.  If you do not
have any micro-jumpers, you can wire wrap the correct jumper pins.       

You can get micro-jumpers from:
National Parts, Catalog# 25-1061, part# JD-0007.

NOTE:  The AT style, IDE Smartdrives will not work with the ST506 Hard 
drives in the same machine.  Both the ST506 and the IDE interfaces use
the same ports and addresses.  This conflict will not be tolerated by 
the system.


(jej-04/21/94)