IBM Personal System/2 60 - Page 50

Reserved
Byte
(Hex
013):
This
byte
is
reserved.
Equipment
Byte
(Hex
014):
The
equipment
byte
defines
the
basic
equipment
in
the
system
for
the
power-on
diagnostic
tests.
Bit Function
7,6
Number
of
Diskette
Drives
5,4
Display
Operating
Mode
3,2 Reserved
1
Math
Coprocessor
Presence
0
Diskette
Drive
Presence
Figure
3-18.
Equipment
Byte
Bits
7,6
These
bits
indicate
the
number
of
diskette
drives
installed
as
shown
in
the
following
figure.
Bits
76
Number
of
Diskette
Drives
00 One Drive
01 Two Drives
10 Reserved
11 Reserved
Figure
3-19.
Equipment
Byte
(Bits
7,
6)
Bits
5,4
These
bits
indicate
the
operating
mode
of
the
display
attached
to
the
video
port,
as
shown
in
the
following
figure.
Bits
54
Display
Operating
Mode
00 Reserved
01
40-Column
Mode
10
80-Column
Mode
11
Monochrome
Mode
Figure
3-20.
Equipment
Byte
(Bits
5,
4)
Bits 3,2 Reserved.
Bit
1
When
set
to
1,
this
bit
indicates
that
a
math
coprocessor
is
installed.
Bito
When
set
to
1,
this
bit
indicates
that
a
diskette
drive
is
installed.
3-18
Model
60
System
Board
—
October
1990