IBM Personal System/2 65 SX User Manual

¢ Generally compatible with the National Semiconductor”
NS16550A serial-communications controller.
¢ The Intel 8088, 8086, 80286, and 80386 microprocessors.
¢ The Intel 8272 diskette-drive controller. The BIOS limits support
to diskette drives that have a 3-millisecond step rate during
recalibration.
¢ The Motorola” MC146818 Time of Day Clock command and status
(CMOS reorganized).
¢ The intel 8042 keyboard port at address hex 0060.
e Display modes supported by the IBM Monochrome Display and
Printer Adapter, the IBM Color/Graphics Monitor Adapter, and the
IBM Enhanced Graphics Adapter.
¢ The parallel printer ports (Parallel 1, Parallel 2, and Parallel 3) in
compatibility mode.
¢ Generally compatible with the Inte! 80387, 80287, and 8087 math
coprocessors.
Whenever possible, BIOS or ABIOS should be used as an interface to
reset the system microprocessor to the real mode.
The system microprocessor also can be reset to the real mode
through bit 0 of port hex 0064 or hex 0092. When using either of these
ports, you must perform the following procedure:
1. Disable all maskable and non-maskable interrupts.
2. Reset the system microprocessor.
3. Issue a Halt instruction to the system microprocessor.
If this procedure is not followed, the results will be unpredictable.
“* National Semiconductor is a trademark of the National Semiconductor Corporation.
** Motorola is a trademark of Motorola, Incorporated.
Model 65 System Board — October 1990 3-27

IBM Personal System/2 65 SX Specifications

General

Brand	IBM
Model	Personal System/2 65 SX
Category	Desktop
Language	English