IBM PS/2 90 XP 486 Hardware Maintenance Reference page 44

3.4.2 SCSI Adapter Terminators
Adapter terminator requirements and locations vary depending on the
following:
Type of SCSI Adapter Installed:
1 (on one side) for a 20-pin terminator.
without pluggable cache used the 20-pin side terminator.
SCSI adapters use the 20-pin side terminator whether they have pluggable
cache or not. Type 1 adapters do not require any other terminator.
The type 2 SCSI adapter does not have a connector on one side for a
terminator. Instead, type 2 SCSI adapters use a 50-pin internal
terminator 2 and a 60-pin external terminator
SCSI Configuration: Adapter terminator requirements vary depending on
whether the SCSI devices installed are internal, external, or both.
Use the figures and the table below to determine SCSI adapter terminator
requirements.
+------------------------------------------------------------------------+
¦ ¦
¦ SCSI ¦ Only
¦ Adapter ¦ Internal
¦ Type ¦ Devices
¦ Installed ¦ Installed
¦ ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 1 ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 1 ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 1 ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 2 ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 2 ¦
+-------------+--------------+--------------+--------------+-------------¦
¦ 2 ¦
+------------------------------------------------------------------------+
Table 1. Adapter Terminator Locations
IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
SCSI Adapter Terminators
The type 1 SCSI adapter has a connector
Originally, only SCSI adapters
3 .
PICTURE 9
¦ ¦
¦ Only ¦ Internal and ¦ Terminator
¦ External ¦ External
¦ Devices ¦ Devices
¦ Installed ¦ Installed
¦ ¦
¦ ¦
¦ ¦
¦ ¦
¦ ¦
¦ ¦
¦ ¦
¦ Copyright IBM Corp. 1990, 1992
3.4.2 - 1
The newest level
¦ ¦
¦
¦ Location ¦
¦ (as ¦
¦ shown ¦
¦ above) ¦
¦ 1 ¦
¦ 1 ¦
¦ None ¦
¦ 3 ¦
¦ 2 ¦
¦ None ¦