IBM PS/2 90 XP 486 Hardware Maintenance Reference page 17

2.3.4 Video
On the Model 90, the video subsystem is on the system board.
95, the video subsystem is on the XGA Display Adapter/A.
subsystem operates in two video modes:
1. VGA compatibility mode
2. XGA compatibility mode.
The adapter comes with four video-memory modules (512KB) installed.
additional sockets are available for installing additional video-memory
modules (maximum video memory is 1MB).
graphics array is in the VGA mode.
text, and all-points-addressable (APA) graphics video modes are supported.
The maximum resolution in VGA compatibility mode is 720-by-400 picture
elements (PELS) in the text mode, and 640-by-480 PELS in the graphics
mode. A maximum of 256 colors or 64 shades of gray are supported in VGA
mode. Composite video is not supported.
The graphics array is in the XGA mode only when enabled by the DOS Adapter
Interface or video device driver (example: MS Windows (**), OS/2 (*), and
Presentation Manager (*) device drivers).
The XGA works with monochrome and color-analog direct-drive displays.
XGA supports the following:
+------------------------------------------------------------------------+
¦ Video Memory
+-----------------------+------------------------+-----------------------¦
¦ Four video-memory
¦ modules (512KB)
¦
+-----------------------+------------------------+-----------------------¦
¦ Eight video-memory
¦ modules (1MB)
¦
+------------------------------------------------------------------------+
(*) Trademark of the International Business Machines
Corporation.
(**) Trademark of the Microsoft Corporation.
IBM PS/2 Model 90 XP 486 and 95 XP 486 HMR
Video
When the system is powered-on, the
In this mode, all VGA alpha-numeric
¦ Resolution
¦ 640 x 480
¦ or
¦ 1024 x 768
¦ 640 x 480
¦ or
¦ 1024 x 768
¦ Copyright IBM Corp. 1990, 1992
2.3.4 - 1
On the Model
The video
Four
¦ Colors
¦ 256 16
¦
¦
¦ 65536 256
¦
¦
¦
¦
¦
¦
¦
¦
¦