Texas Microsystems, Inc. 2003 User manual

2000 SERIES INDUSTRIAL COMPUTERS
User Manual
January 1988

<C) Copyright Texas Microsystems, Inc. 1986
All rights reserved.
Trsdemarks:
The £ollowing are trademarks o£ International Business
machines: IBM, AT, XT
The in£ormation in this document is believed to be
accurate. However, Texas Microsystems, Inc. does not
assume any liability £or inaccuracies caused by human
error, misinterpretation, typography, or other causes.
All equipment speci£ications are subJect to change
without notice.
ii

1.
2.
3.
3.4
4.
5.
TABLE OF CONTENTS
GENERAL DESCRIPTION ••••••••••
1.1 Introduction •••••••••••••
1.2 Computer Speci£ications.
1.3 B286 Speci£ications ••••••
CONFIGURATION AND INSTALLATION •••
Rack Mounting •••••••••••••••
1
1
1
2
3
3 2.1
2.2
Cable Connections........... • •••• 4
2.2.1 Power Connections and Operating Voltagea 4
2.3
2.2.2 Keyboard Connections.. • ••••
2.2.3 Monitor Connections ••••••••
2.2.4 External Speaker Jack •••••••
Installing Modular Options ••••••••
2.3.1 Accessing Modules in the 2001
2.3.2 Accessing Modules in the 2003
2.3.3 Accessing Modules in the 2004
2.3.4 Expansion Slot Con£iguration ••
2.3.5 Option Compatibility ••
Computer.
Computer ••
Computer ••
OPER'ATION •••••••••••••••••••••••••
3.1
3.2
Firmware Operation •••••••••••••••••••••••
3.1.1 BIOS Startup Routine ••
3.1.2 Setup Utility ••••••••••••••••••••
3.1.3 Changing Processor Clock Speed.
3.1.4 Continuous Loop Diagnostics.
Preparing the Hard Disk Drive •••••
3.2.1 Partitioning the Hard Disk •••••••
3.2.2 Formatting the Hard Disk ••••••••••
3.3 Floppy Disk Drives ••••••••••••••••••••••
3.3.1 Compatibility Guidelines ••••••••••
BASIC Interpreter........ ••••••••• • ••••••
MAINTENANCE............... ••••• • •••••
4.1
4.2
4.3
4.4
Fuses ••••••••••••••••
Fan Filters •••••••••••••••••
4.2.1 2001 Computer Filter ••
4.2.2 2003 Computer Filter ••••
Replacing the B286 Battery ••••
Factory Return Goods Authorizations
.....
(RGA) •••
MODULES ••••••••••••••••••••••••••••••••
5.1 Central Processing Units (CPUs).
5.1.1
5.1.2
5.1.3
5.1.4
5.1.5
5.1.6
5.1.7
5.1.8
B286 (AT) CPU •••••••••
Description ••••.•••••••
Speci£ications •••••••••••••
Installation ••••••••••
Rev D Con£iguration...... • ••••••••••••
Rev A-C Con£iguration.... •••••• • ••••
Schematics £or rev D CPU. • ••••••
Schematics £or rev A-C CPU ••
iii
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S
S
S
S
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8
9
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2S
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1. GENERAL DESCRIPTION
1.1 Introduction
The 2000 series of industrial computers are suited to a
wide variety of applications where durability. and
ruggedness are required from a powerful IBM PC XT/AT
compatible computer system. Factory automation.
machine control. process control and data acquisition
systems are only a few of these applications.
Because the computers are completely IBM XT or AT
compatible, they take advantage of hundreds of
application software packages. translators, and
operating systems. Hundreds, possibly thousands of
compatible plug in cards ranging from sophisticated
graphics cards to thermocouple sensors cards are also
available.
This manual can be used in conJunction with the 2001A,
2003A and 2004A AT computers for configuration
reference, setup and operating information, maintenance
procedures. and specifications.
1.2 Computer Specifications
Each o£ the computers have the following features in
common:
- IBM PC/AT Compatibility
- Shock mounted disk drives (in most configurations)
- Passive backplane (5,8 bit and 5,16 bit slots>
- Vertically removable CPU card for maintenance
- 150 Watt power supply
In addition, the 2001 computer is designed to be
mounted in a 19
11
RETMA rack. It features positive
pressure. filtered airflow, a separate compartment for
circuit cards. and up to three shock mounted disk
drives.
The 2003 computer is a smaller benchtop or wall mounted
computer for more specialized applications. It
typically has a hard disk and/or one floppy disk.
A portable,
sometimes used
in industrial
diskettes.
self contained floppy disk drive is
with this computer when it is installed
environments not suitable for floppy
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The 2004 computer features NEMA 4 packaging and
electronics contained in a sealed compartment cooled by
a unique moving air heat exchanger.
1.3 B286 Specifications
The B286 CPU is a high performance IBM AT compatible 6
layer CPU card featuring the following:
- Up to 1 Megabyte of parity checked DRAM memory
- Switchable clock: 6 and 8 or optional 6 and 10 MHz
- On-board battery supports real time clock
- 80287 Co-processor socket
- Proprietary Bios with built-in "setup" program
- External reset switch and speaker Jack
Rather than mount horizontally in the the bottom of the
computer. (as with a typical motherboard computer) the
B286 plugs into a passive horizontal motherboard. If
replacement is required, the board can be removed and
replaced as easily as any expansion card. There is no
need to disconnect any cables or remove any other
boards.
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2. CONFIGURATION AND INSTALLATION
This section describes rack mounting of the 2001
computer, cabling, and expansion module installation
and removal.
2.1 Rack Mounting
The 2001 computer and CRT display models 1003R, 1004R,
and 1005R are designed to be mounted in a 19-inch RETMA
rack with ChassisTrak 300-S-120 slides. Equivalent
slides from other manufacturers that have matching hole
spacing and alignment may also be used.
The steps for attaching slides to the displays and the
computer are the same. Mounting hardware is supplied
with the. slides.
9~YI!Q~
DO NOT attempt to mount the computer or
display by attaching these units from
the front panel only.
SLIDE MOUNTING INSTRUCTIONS
1. Two slides are required for each chaasis, one on
each side. Separate each slide into two parts.
2. Select the slide parts that have a hole pattern
matching the threaded holes on the computer.
Using screws provided, attach a slide to right and
left sides of the computer chassis (5 screws on
each side, the spring loaded stop mounts to the
rear of the computer).
3. Attach the second part of the slides to the 19-
inch rack. Position the slides on the left and
right sides of the rack and screw each end of the
slide into the rack.
4. Insert the computer into the rack by mating the
computer slides with the rack slides. Make sure
that the computer is level and properly aligned
when it slides onto the rack.
5. Push the computer completely onto the rack.
Secure the computer front panel into the rack
using 4 screws
(8 screws
on
monitors).
6. Repeat this procedure
to
rack
mount
the CRT
display.
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2.2 Cable Connections
Before connecting the computer to a power source,
connect the CRT display and keyboard to the computer.
If the computer is to be rack mounted, refer to the
slide and rack mounting instructions before connecting
cables.
2.2.1 Power Connections and Operating Voltages
The 2001A rack mountable computer is capable of
powering two devices plugged into two external AC
receptacles on the rear. The combined current handling
capability of the two receptacles is approximately 6
amps. The total current drawn by a fully loaded unit
including the computer with a full set of circuit cards
and 6 amps on external devices is 10 amps.
The 2003A and 2004A
draw approximately
configured.
computers are self contained and
4 amps of current when fully
The 2000 Series Computers can be modified at the
factory to operate using 220-volt AC power or various
DC power voltages. The following considerations apply
with this modification: l)the fan is replaced to
operate properly with the selected input power
selected; 2)fuses are replaced; 3)the power supply is
Jumper selected for 220 volts or replaced with the
correct DC modules.
It should be noted that special considerations may be
necessary to select CRT monitors for non standard power
situations.
2.2.2 Keyboard Connections
Both the AT and XT keyboard five-pin connectors are
identical for all 2000 Series computers. The XT key-
board is specifically designed for the XT computer and
do •• not operate properly with an AT model. However, a
Jumper .'odification inside the AT keyboard allows it to
be downward compatible and to operate as an XT
keyboard. Identification part numbers are placed on
the underside of each keyboard.
On the 2001A computer, the keyboard connector is at the
lower left corner of the front panel~ For applications
which require it, a rear mounted keyboard connector is
available as an option.
On the 2003 computer, the keyboard connector is at the
lower right corner at the back of the computer.
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2.2.3 CRT Display Connections
On the 2001A computer the CRT display power cable can
be plugged into the computer auxiliary power outlet.
The signal cable connects the Crt to the video card
connector at the back o£ the computer.
When connected to the auxiliary outlet, power is
supplied to the CRT display as soon as the computer is
powered-up.
The 2003A computer
outlets. There£ore,
plugged into a local
connects to the video
computer.
does not have auxiliary power
the display power cable should be
outlet. The display sig~al cable
card connector at the back o£ the
2.2.4 External Speaker Jack
An external speaker Jack is standard on the AT computer
and optional on the XT computer. The speaker Jack,
provides the capability £or audio output to an external
alarm or public address system. The speaker Jack is
located on the CPU card at the back o£ the computer.
2.3 Installing Modular Options
The 2000a Series Computer design provides £or easy
access to add or upgrade the system. Each computer is
slightly di££erent. The steps to access cards £or each
computer are described in the £ollowing paragraphs.
HQIg
All captive nuts used in the 2000 Series
Computers are sel£-locking. Extra
e££ort may be required to loosen or
tighten the screws during installation.
2.3.1 Accessing Cards in the 2001 Computer
1. Power-down the computer.
2. Remove the 3 screws £rom the hinged access panel
on top. Remove the hinged access panel (note the
position o£ the access panel hinge tabs) and place
the screws and the panel in a convenient place.
3. Unscrew and remove the hold-down clamp that £its
across the circuit boards.
4. To install circuit cards,
instructions £or the card
Section 4). In addition,
instructions that come with
Preliminary AT Users Manual
re£er to the speci£ic
to be 'installed (see
read any installation
the option purchased.
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2.3.2 Accessing Circuit Cards in the 2003 Computer
1. Power-down the computer.
2. Remove the 4 screws on each side o£ the top cover.
Remove the top cover and place the screws and the
cover in a convenient place.
3. Unscrew and remove the hold-down clamp that £its
across the circuit boards.
4. To install circuit cards, re£er to the speci£ic
instructions £or the card to be installed (see
Section 4). In addit~on, read any installation
instructions that come with the option purchased.
2.3.3 Accessing Circuit Cards in the 2004 Computer
1. Power-down the Computer.
2. Open the outer door.
3. Unscrew the two thumb screws at the top o£ the
inside chassis.
4. Insure adequate service loop is available £or all
cables and then swing out (down) the inner
chassis.
5. Unscrew and remove the hold-down clamp that £its
across the circuit cards.
6. To install circuit cards, re£er to the speci£ic
inatructions £or the card to be installed (see
Section 4). In addition, read any installation
instructions that come with the option purchased.
2.3.4 Expansion Slot Con£iguration
The 2000 Series AT computer has £ive 8-bit and £ive 16-
bit expansion slots. Viewing the back o£ the computer,
£rom right to le£t, expansion slots 1, 2, 3, 9, and 10
are the 8-bits and slots 4, 5, 6, 7, and 8 are 16-bits.
Each 8-bit slot has one 62-pin connector providing 8
data bits and 20 address lines. This con£iguration is
equivalent to an address space o£ 1M byte that is 8
bits wide.
Each 16-bit slot has two connectors. A 62-pin connec-
tor contains the lower 8 data bits and lower 20 address
lines. A 36-pin connector contains the upper 8 data
bits and upper 4 address lines. The combined bus con-
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figuration has a capacity of 16M bytes of address space
that is 16 bits wide.
The 2000 Series XT configuration has ten 8-bit expan-
sion slots. Each slot has a 62 pin connector that pro-
vides 8 data bits and 20 address lines.
The AT 16-bit expansion cards are slightly (0.6 inches)
taller than the XT 8-bit expansion cards. To provide
for a hold down clamp that can accommodate the
different height boards, the AT cards are grouped
together near the center of the expansion slots
2.3.5 Option Compatibility
Modular options are added by means of expansion cards
that plug into the computer bus (expansion slots).
This bus is designed to be both electrically and
mechanically compatible with the equivalent
International Business Machine computer models.
On the 2000 Series AT (6MHz clock speed) and XT models,
the bus timing is identical to the IBM equivalent. The
AT computers, operating at 8 or 10 MHz, have faster bus
transfer rates and may not be compatible with all
expansion cards.
Although XT 8-bit expansion cards may work
electronically in the AT 16-bit slots, the XT cards may
not be physically compatible because the AT has the
additional 36 pin connector. In addition, the AT 16-
bit cards are not designed to work in 8-bit slots.
Expansion card compatibility may also vary, depending
on the manufacturer.
Processor clock speed differences may also effect
expansion card compatibility. The 2000 Series, AT,
80286 processor operates at a much faster speed (6, 8,
or 10 MHz) than the XT model 8088 processor speed (4.77
MHz). To accommodate this speed difference, the B286
card contains a programmable wait state generator which
inserts additional time in the bus transfer cycles.
Refer to the module section for a detailed description
of this feature. For most plug in modules, the
additional wait states are all that is required for
compatibility. If a speed problem is suspected,
contact the manufacturer of the plug in circuit card
regarding operation at the higher bus speeds.
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3. OPERATION
This section describes the operation o£ the computer_
including a description o£ the BIOS and SETUP £irmware
contained on the B286 CPU.
3.1 Firmware Operation
The B286 board contains approximately 32k o£ £irmware
in two 32K x 8 EPROMS. This £irmware per£orms power-on
computer checks, sets up the computer hardware, and
contains the internal setup routines £or con£iguration.
The computer can be restarted using three methods:
1. Cycle the ON/OFF power switch to the ON position.
2. Reboot the computer - Press and hold the CTRL and
ALT keys and then press the DELETE key.
3. Press the RESET pushbutton - the computer stops
processing activities and reboots. This method is
only recommended as a "last resort" because loss
o£ data can result i£ a program is in process.
The BIOS per£orms internal diagnostics to check the
current con£iguration against the con£iguration
in£ormation recorded in CMOS memory during Setup. 1£
inconsistencies exist, BIOS error messages are
displayed. Some o£ these errors can be quickly
corrected by checking the Setup in£ormation. More
technical errors require the assistance o£ trained TMI
technical personnel. Some o£ the elements tested during
BIOS diagnostics include the £ollowing:
Processor CPU chip
DMA controllers
Floppy disk drive controllers
Hard disk drive controller
Hard disk drive con£iguration
Real time clock chip
Interrupt controller chip
Keyboard
Time-o£-day clock (CMOS RAM)
Video controllers
RAM memory
BIOS ROM (check aum used £or validity)
Although BIOS power-up diagnostics are not
comprehensive, the £ew seconds that the BIOS routine
requires are very e££ective in identi£ying problems.
For in depth diagnostics that are more comprehensive
and require more time, the International Business
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Machines Advanced Diagnostics program £or the AT can be
used.
3.1.1 BIOS Startup Routine
The BIOS is a collection o£ driver and initialization
so£tware stored in ROM on the CPU board. The BIOS is
designed to be totally compatible with so£tware written
£or the IBM personal computers. The IIO drivers are
invoked through the so£tware interrupt structure o£ the
80286 processor.
The largest portion o£ the BIOS so£tware program,
(approximately 4K bytes), is devoted to computer
startup. During this procedure, the memory and IIO
ports are tested and initialized. I£ everything goea
well and no errors are discovered, an operating system
is loaded and executed £rom the disk or other mass
storage device. The BIOS startup routine is as
£ollows:
1. The 80286 executes a Jump instruction to the BIOS
start point.
2. The CPU £lags are tested. The 80286 processor
register set is tested. I£ either o£ these tests
£ails, the CPU halts.
3. Video controllers are stabilized.
4. The £ollowing
occurs during
halts.
tests are per£ormed. I£ a £ailure
anyone o£ these tests, the CPU
5. The shutdown byte in CMOS RAM is tested £or
reliability.
6. The 8254 timer is tested.
7. DMA controllers are tested.
8. DMA page registers are tested.
9. DMA controllers are initialized.
10. Memory re£resh is tested.
the CPU halts.
I£ a £ailure occurs,
11. Bus A20 line is disabled.
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12. The £irst 64K bytes o£ memory are tested. I£
£ailure occurs, the £ollowing error message is
displayed:
oooo:xxxx yyyy #201
Where: x = Failing Address
y = Failing Data
13. The stack is set up.
14. The interrupt controllers are initialized.
15. All interrupt vectors are set to the temporary in-
terrupt handler.
16. So£tware interrupt vectors are initialized.
17. The 8042 keyboard peripheral inter£ace chip is
tested.
18. CMOS memory is tested.
19. Base memory size is determined.
20. Video controllers are tested against the CMOS con-
£iguration.
21. Video card BIOS ROMs are initialized.
22. Video cards are tested. 1£ the video card tested
does not agree with the #1 switch setting on the
CPU card, an audible beep is heard (one long and
two short beeps>.
23. Hardware interrupt vectors are initialized.
24. De£ault power-up processor speed is selected.
25. The monitor screen is cleared and the TMI logo is
displayed with the £ollowing message:
The TMI INDUSTRIAL COMPUTER BIOS
Sel£-Test in Progress, Please Wait
26. Keyboard is tested.
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27. Floppy disk drives are tested. If an error occurs
one o£ the £ollowing messages is displayed:
Floppy seek error • •
Press F1 to Continue.
Floppy reset error • •
Press F1 to Continue.
If a floppy disk error occurs, the Setup
Utility is invoked automatically. The
floppy disk drive configuration data on
the Setup screen should be checked. If
the con£iguration is accurate, re£er to
Section 3 on Troubleshooting.
28. Printer and RS232 timeouts are set
29. The type £loppy disk drive is determined.
30. Base addresses for RS232 cards are determined.
31. Base addresses for the printer card are deter-
mined.
32. BIOS tests for the existenee of the 80287 numeric
coprocessor.
33. Memory test is performed on the video card. If an
error occurs, the following message is displayed:
Memory Test Failure
Address = xxxx, Data = yyyy
Continue? (YIN)
Where:
x = address
y = failing bit pattern
!'!2!:!
If Y is entered to continue the BIOS
will try to down-size the memory and
continue the power-up sequence. If an
error exists, it is recommended that the
user rectify the problem, since un-
reliable operation may occur otherwise.
34. The monitor
displayed.
screen is cleared and the TMI logo is
The £ollowing message is displayed:
The TMI INDUSTRIAL COMPUTER BIOS
Self-Test in Progress, Please Wait
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35. The base memory size and clock speed are written
to the screen as £ollows:
Base memory size is ____ K, Clock speed is xxxx MHz.
36. Expansion memory
greater than zero,
£ollows:
size is determined, and
is written to the screen
Expansion memory size is K
i£
as
37. Base memory is tested. 1£ an error occurs, the
£ollowing message is displayed:
Memory Test Failure
Address = xxxx, Data = yyyy
Continue? (YIN)
Where: x = address
y = £ailing bit
N2~~
1£ Y is entered to continue the BIOS
will try to down-size the memory and
continue the power-up sequence. 1£ an
error exists, it is recommended that the
user recti£y the problem, since un-
reliable operation may occur otherwise.
38. Expansion memory is tested. 1£ an error occurs,
the £ollowing message is displayed:
Address = _____ , Should Be = H,
Is ____ H
39~ Hard disk is initialized.
40. Expansion card BIOS ROMs are initialized.
41. Keyboard and timer interrupts are enabled.
42. BIOS ROM checksums are calculated. 1£ an error
occurs, the £ollowing message is displayed:
ROM Checksum error.
43. BIOS Report Sequence. In steps 44 through 48, the
computer displays a message £or each error that
occurred during power-up:
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44. Hard disk errors; one o£ the following messages
may be displayed:
Hard disk controller
Hard disk failure on Drive 0
Hard disk failure on drive 1
45. Memory size comparison errors; the following
message is displayed:
Invalid memory size con£iguration
46. CMOS equipment configuration error; the following
message is displayed:
Invalid CMOS equipment con£iguration.
47. CMOS checksum error; the following message is
displayed:
CMOS checksum is bad.
48. Bad Battery; the £ollowing message is displayed:
Bad battery £lag set in CMOS.
49. If any of the errors (44 through 48) occur, the
Setup Utility is invoked automatically. The
configuration data on the Setup screen should be
checked for accuracy. If the con£iguration is
accurate, press F1 to continue.
50. BIOS Report Sequence. In steps 51 through 54, the
computer displays a message for each error that
occurred during power-up. Each message is
displayed for 5 seconds and then messages are
cleared.
51. Keyboard error
displayed:
the £ollowing message
Keyboard error or keyboard not present.
is
52. Type Monitor doesn't agree with switch setting on
video card - one o£ the following messages may be
displayed:
Display switch set for color adapter
Display switch set for monochrome adapter
53. Video card horizontal sync output not present-
the following message is displayed:
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Status error £rom display adapter.
54. Video output not present - the £ollowing message
may be displayed:
No video signal £rom displsy adapter.
55. 1£ any o£ the errors (51 through 54) occur. the
Setup Utility is invoked automatically. The
con£iguration data on the Setup screen should be
checked £or accuracy. 1£ the con£iguration is
accurate. press F1 to continue.
56. 1£ the CPU card switch £or Loop Diagnostics is
set. the BIOS startup routine repeats. otherwise.
the £ollowing steps are per£ormed.
57. Operating system is loaded. the £ollowing message
is displayed:
Loading Operating System
58. BIOS checks £or valid ROM at address EOOO:OOOO.
and i£ valid ROM exists. the program Jumps to that
address. 1£ not. the nonmaskable interrupts are
armed.
59. The Operating system is actually loaded £rom the
disk and control is trans£erred to the operating
system.
3.1.2 Setup Utility
The Setup Utility is used to set the computer time.
date and con£iguration data. Setup is made up o£ two
screens (pages). The £irst screen records computer
con£iguration in£ormation. The second screen initiates
a Parking Utility used to prepare the disk drives £or
shipping.
The Setup Utility resides in ROM; the con£iguration
in£ormation resides in CMOS RAM. Each time the
computer is powered-up. the BIOS per£orms computer
diagnostics and checks the con£iguration in£ormation
stored in memory against the actual con£iguration being
tested. 1£ inconsistencies are discovered. BIOS error
messages are displayed. The £ollowing steps describe
how to use the Setup Utility:
1. To access the Setup Utility. press the CTRL and
ALT keys at the same time and then press the S
key. Page 1 o£ the Setup Utility is displayed.
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2. Use the up and down arrows to select the desired
field. Use the plus (~) and minus (-) keys on the
keypad to scroll through possible choices.
Time Sets the computer real time
clock (24 hour format)
Date Sets the computer date
(mm/dd/yyyy)
Floppy Disk Drive A:
Floppy Disk Drive B:
Hard Disk Drive C:
Hard Disk Drive D:
Monitor Type
Base memory size
Expansion memory size
Power-up Processor
Drive capacity: High Capacity
(1.2M bytes)~ Double Sided
(360K bytes), 3.5-inch (720K
bytes) drive.
Drive capacity: Double Sided
(360K bytes), High Capacity
(1.2M bytes)~ 3.5-inch (720K
bytes)drive.
Drive type (Range 1 to 15, see
table) or not installed
Drive type (Range 1 to 15, see
table) or not installed
Monochrome~ 40 Column Color,
80 Column Color, EGA or other
Range from 128K to 640K bytes
in 128K increments
Range from OM to 15M bytes in
128K increments
Options are: 6~ 8, or 10MHz
3. After modifications are made, press Fl to restart
the computer from power-up.
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Setup Utility (Page 1)
Texas Microsystems Inc.
B286 Setup Utility Version x.x
Use the up and down arrow to select de-
sired £ield. Use the plus (+) and minus
(-) keys on the keypad to scroll through
possible choices.
Time (24 hour £ormat)
Date • • • •
Floppy Disk Drive A:
Floppy Disk Drive B:
Hard Disk Drive C:
Hard Disk Drive D:
Monitor Type
• 0<:3:50:56
• 07/06/1<:386
•• High Csp. (1.2M)
Double Sided (360K)
• Type 1
Not Installed
• Monochrome
Base memory size
Expansion memory size • •
Power-up processor speed
• 512K
• 512K
• 8MHz
Type FlO to go to SETUP page 2
Type F1 to restart computer £rom power-up
Note: F2 may be used to continue. This may cause
unexpected results. See user manusl £or
details.
Notes on Using Setup Utility Function keys:
1. Press F1 to restart the computer, simulating a
power-up. When Setup in£ormation is changed, the
computer should be restarted £rom power-up, so
that BIOS can read the new data stored in memory.
2. Press FlO to prepare the disk drives £or shipment.
(Re£er to the Packing £or Shipment instructions
later in this section.)
3. Press F2 to continue.
as £ollows:
This £unction can be used
The Setup Utility can be selected to view the ex-
isting computer con£iguration in£ormation. As
long as no changes are made, BIOS diagnostics are
not a££ected. Under these conditions, pressing F2
allows the computer to continue and operate
normally.
I£ con£iguration in£ormation is changed and the
computer is not restarted £rom power-up (F1), BIOS
diagnostics are not updated. Under these condi-
tions, pressing F2 allows the computer to
Preliminary AT Users Manual
16
11/26/86

continue. However~ operating inconsistencies can
result that may cause the computer to abort.
(Re£er to the BIOS Startup Routine and Error
Messages discussed previously in this section.)
Supported
£ixed disk con£igurations:
Type Cyls. Hds.
Size
(M Bytes)
1 306 4
10
2 615 4
20
3 615 6 30
4
940
8
60
5 940 6 45
6 615
4
20
(no precomp)
7
462
8
30
8 733 5 30
9 900 15 110
10
820 3
20
11 855 5
35
12
1024
5
40
13 306 8
20
14 1024 8
70
3.1.3 Changing Processor Clock Speed
The 2000 Series AT eon£iguration has a 80286 processor
and operates at clock speeds o£ 6 or 8 and 6 or 10 MHz.
The £ollowing two methods can be used to modi£y the
processor clock speed.
1. Use the Setup Utility (page 1) to modi£y the
power-up processor speed £ield.
2. Use a quick key method that can be used any time.
Press and hold the CTRL and ALT keys at the same
time, then type the desired speed:
6 = 6 MHz
8 = 8 MHz
1 = 10 MHz
3.1.4 Continuous Loop Diagnostics
The BIOS diagnostics can be executed in a continuous
loop program by simply changing one o£ the switch set-
tings on the CPU card. Continuous Loop Diagnostics are
used at the £actory to test all equipment be£ore
shipment. This procedure can also be used £or
con£idence testing i£ computer integrity is in
question. Re£er to the the B286 section o£ the MODULES
chapter on how to setup £or loop diagnostics.
Preliminary AT Users Manual
17
11/26/86