PC36AT/LP - Amplicon

PC36AT/LP
PC36AT/LP
24 LINE
PROGRAMMABLE
DIGITAL
INPUT/OUTPUT
BOARD
This Instruction Manual is supplied with the PC36AT and PC36LP boards to provide the user with sufficient information
to properly utilise the product as purchased. The information contained has been reviewed and is believed to be accurate
and reliable, however Amplicon Liveline Limited accepts no responsibility for any problems caused by errors or
omissions. Specifications and instructions are subject to change without notice.
PC36AT and PC36LP Instruction Manual Part Nº 858 931 64 Issue B7
© Amplicon Liveline Limited
Prepared by C.A. Kenny
Approved for issue by A.S. Gorbold, Operations Director
Page 1
PC36AT/LP
DECLARATION OF CONFORMITY
AMPLICON LIVELINE LIMITED
CENTENARY INDUSTRIAL ESTATE
HOLLINGDEAN ROAD
BRIGHTON BN2 4AW UK
We declare that the product(s) described in this Instruction Manual are
manufactured by Amplicon Liveline Limited and perform in conformity
with the following standards or standardisation documents:
EMC Directive 89/336/EEC
LVD Directive 73/23/EEC
CE Directive
93/68/EEC
Jim Hicks, I. Eng, MIEIE
Managing Director
Amplicon Liveline Limited
Page 2
PC36AT/LP
CONTENTS
PARAGRAPH
SUBJECT
PAGE
1
1.1
1.2
1.3
1.4
1.4.1
1.4.2
INTRODUCTION
General Description
What the Package Contains
Key Technical Features
Contacting Amplicon Liveline Ltd for Support or Service
Technical Support
Repairs
1
1
1
1
2
2
2
2
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
2.9.1
2.10
2.11
2.12
2.13
2.14
USING THE PC36AT/LP
General Information
Requirements to Operate the Board and Program
Backing up the Software Diskette
Installing the Software on a Fixed Hard Disk
Digital Input/Output
Digital Input/Output Conditions
Digital Input/Output Connections
Digital Input/Output Port Addresses
Customer-configured Base Address
PC I/O Map
Wait-state Generator
Interrupt Request Level Selection
Installing the PC36AT/LP in the Computer
Testing the PC36AT/LP
Socketed Integrated Circuits
3
3
3
3
3
4
5
5
5
6
6
7
8
9
9
9
3
3.1
3.2
3.3
ELECTRICAL CONNECTIONS
37 way D type Connector (SK1 User Input/Output)
Voltage Outputs Available on SK1
Main I/O Bus Backplane Connections
10
10
11
11
4
4.1
4.2
PROGRAMMING THE PC36AT/LP
Demonstration Software
Programming the 82C55 PPI
12
12
12
5
5.1
5.2
TECHNICAL SPECIFICATIONS
Electrical Specifications
Physical Specifications
13
13
13
LIST OF FIGURES
FIGURE Nº
TITLE
PAGE
2.1
2 .2
2.3
3.1
3.2
DIL SWITCH BASE ADDRESS SELECTION
WAIT STATE SETTINGS
IRQ JUMPER SETTING
INPUT/OUTPUT CONNECTOR
MAIN PC BUS BACKPLANE CONNECTOR
6
7
8
10
11
APPENDICES
APPENDIX
SUBJECT
APPENDIX A
82C55
Circuit and Assembly Diagrams
Data Sheets on 82C55 Programmable Peripheral Interface
PAGE
14
i - xv
Page 3
PC36AT/LP
1.
1.1
INTRODUCTION
General Description
The PC36AT and PC36LP are half sized plug-in boards which provides 24 lines of
programmable digital input/output. The PC36AT can be used in most IBM compatible PC/XT,
AT/286/386 and higher computers. The PC36LP is a low power version of the board for use in
portable computers.
1.2
What the Package Contains
The package as delivered from Amplicon Liveline Ltd. contains:1.
The plug-in card, PC36AT or PC36LP as ordered, in a protective bag. The board type is
identified by a marker in the appropriate position to indicate the model.
! CAUTION
Some of the components on the board are susceptible to electrostatic discharge, and
proper handling precautions should be observed. As a minimum, an earthed wrist strap
must be worn when handling the PC36AT/LP outside its protective bag.
Full static handling procedures are
BSEN100015/BSEN100015-1:1992.
defined
in
British Standards Publication
When removed from the bag, inspect the board for any obvious signs of damage and
notify Amplicon if such damage is apparent. Do not plug a damaged board into the host
computer. Keep the protective bag for possible future use in transporting the board.
1.3
2.
The included distribution software on a high density 31/2 inch diskette (part nº 868 931
67) Please note:
Software items are supplied on 31/2 inch diskettes. Please
1
request copies on 5 /4 inch diskettes if this size is more convenient.
3.
This Instruction Manual.
Any additional accessories (mating connectors, optional software, applications
notebook etc.) may be packed separately.
Key Technical Features
• Flexible card base address in the range 00016 to FFC16.
• Interrupt driven operation with selectable Interrupt Request levels.
• Wait state generator incorporated on board to provide compatibility with most PCs.
• 24 digital input/output lines, all programmable.
• TTL level compatible input/output with 2.5 mA drive capability
• Free demonstration software in Turbo Pascal and BASIC
• PC36LP low power version draws only 35mA from the host computer.
Page 4
PC36AT/LP
1.4
Contacting Amplicon Liveline Limited for Technical Support or Service
The PC36AT and PC36LP boards are designed and manufactured by Amplicon Liveline
Limited and maintenance is available throughout the supported life of the product.
1.4.1
Technical Support
Should the PC36AT/LP board appear defective, please check the information in this manual
and any 'Help' or 'READ.ME' files appropriate to the program in use to ensure that the product
is being correctly applied.
If an application problem persists, please request Technical Support on one of the following
numbers:
Telephone: UK
International
0906 293 0293
+44 906 293 0293
Calls cost 25p per min from a BT landline. Calls from other services may vary
Fax:
UK
International
Email
World Wide Web
1.4.2
01273 570 215
+44 1273 570 215
[email protected]
www.amplicon.co.uk
Repairs
If the PC36AT/LP board requires repair then please return the goods enclosing a repair order
detailing the nature of the fault. If the board is still under warranty, which period is 12 months
from the date of shipment, there will be no repair charge.
For traceability when processing returned goods, a Returned Materials Authorisation (RMA)
procedure is in operation. Before returning the goods, please request an individual RMA
number by contacting Amplicon Customer Services by telephone or fax on the above numbers.
Give the reason for the return and, if the goods are still under warranty, the original invoice
number and date. Repair turnaround time is normally five working days but the Service
Engineers will always try to co-operate if there is a particular problem of time pressure.
Please mark the RMA number on the outside of the packaging to ensure that the package is
accepted by the Goods Inwards Department.
Address repairs to:
Customer Services Department
AMPLICON LIVELINE LIMITED
Centenary Industrial Estate
Brighton, East Sussex
BN2 4AW
England
Page 5
PC36AT/LP
2.
2.1
USING THE PC36AT/LP
General Information
The PC36AT/LP provides 24 lines of user programmable digital input/output and is supplied
complete with demonstration software written in Borland Turbo Pascal and BASICA
(GWBASIC). The source code for the Turbo Pascal program is supplied, and is compatible with
versions 4 and above. The source code for BASICA is also supplied, which is compatible with
GWBASIC and other variants. A copy of the language will be needed if the user wishes to list
or edit the code.
2.2
Requirements to Operate the Board and Program
This board is suitable for use in any PC compatible computer that can provide a single ISA
standard 8 bit I/O slot, with sufficient space for a half length card. Most PC compatible
computers, XT and AT 286/386/486 and above, including portables, can accomodate and
provide power for this board.
In addition to the above host computer, the following minimum software and hardware are
required in order to enable the program to be run:
•
•
•
•
2.3
DOS 3.3 or later
PC36AT or PC36LP (fitted)
31/2 inch disk drive (See paragraph 1.2 if 51/4 inch diskettes are required)
A monitor
Backing up the Software Diskette
It is important that a backup copy of the software diskette is made and the original stored in a
cool dry safe place. The diskette can be copied onto a blank diskette by using the MS-DOS
command:
DISKCOPY A: A:
on a single drive machine, or:
DISKCOPY A: B:
on a twin drive machine.
Always use the copy for your work.
2.4
Installing the Software on a Fixed Hard Disk
If it is required to copy the software onto a fixed disk, make a directory called PC36AT using
the command:
MD\PC36AT
If a suitable directory is then to be made on drive C:
Page 6
PC36AT/LP
1.
Change to this directory by typing
CD\PC36AT <RETURN>
2.
Put the PC36AT demonstration diskette in drive A and type:
COPY A:*.* C: <RETURN>
This will copy all of the files into the new PC36AT directory.
2.5
Digital Input/Output
This digital I/O board features an uncommitted 82C55 CMOS Programmable Peripheral
Interface (PPI) which can be configured in a variety of operating modes. The operational mode
for each port is established by writing to the control register of the 82C55. This control word
also establishes whether the port is configured to operate as input, output or bi-directional.
The control word is 8 bits and has two formats. When bit 7 is set to 1, the control word is used
to establish the operational modes for the ports. When set to 0, the control word is used to write
bits to Port C for status/control purposes.
The digital I/O facility of the PC36AT/LP provides all 24 lines on three 8 bit ports, labelled DIO
Port A0 - A7, DIO Port B0 - B7 and DIO Port C0 - C7. These ports are further divided into two
groups of 12 bits each, group A comprising the 8 bits of port A and the high order 4 bits of port
C, and Group B comprising the 8 bits of port B and the low order 4 bits of port C. When port C
is split in this mode, note that when a half byte of data is being read from or written to port C,
those four bits occupy the appropriate high or low end of a full byte, the other four bits not being
used.
Full details of programming the 82C55 PPI at register level, in its various modes, are shown in
the device specification in the appendix, and examples of programming are given on the
demonstration diskette. The three basic operating modes are summarised below.
Mode 0 (Basic Input/Output)
This mode is the power-up default with all ports set as input.
In mode 0, the PPI provides simple input/output operations. No control signals are
required and the ports defined as input reflect the current state of digital signals on
the lines (no latching). The lines of output defined ports are set to zero on the
mode change, and when a port is loaded, the outputs are latched to that value
All 24 bits can be used for input or output arranged as any combination of two 8 bit
ports and two 4 bit ports.
Mode 1 (Strobed Input/Output)
Mode 1 provides I/O operations on Group A and/or Group B each with a simple
handshake protocol. In either group, the 4 bit port is used for status and control of
the associated 8 bit port. An IRQ facility in this mode is available on the
PC36AT/LP.
Page 7
PC36AT/LP
Each 8 bit port can be used uni-directionally for either input or output operations,
both being latched.
Mode 2 (Strobed Bi-directional Input/Output)
This mode of operation can be applied to group A only, and provides one 8 bit bidirectional data port and one 5 bit control and status port with IRQ facility. Both
input and output operations are latched. Port B can be used in mode 0 or 1 while
port A is in mode 2.
Mixed Mode
The ports of the PPI can be programmed to operate in a mixed combination of
modes that in some cases leave bits of port C unused for control or status
purposes. These unused bits can be programmed for use as inputs or outputs.
2.6
Digital Input/Output Conditions
Brief specifications of the digital input/output lines on ports A, B and C are:Inputs -
'Low' input voltage -0.3v to +0.8v.
)
'High' input voltage
+2.2v to +5.3v.
TTL
) compatible
When an input line is left open circuit, its high input impedance makes it
susceptible to static charge and interference and the state may be indeterminate.
Ensure that signals to any inputs are within the above limits, and that any unused
input lines are grounded or masked out in software. Optional pull down 100 kΩ
resistor networks RN2, 3 and 4 can be fitted to the I/O lines if required.
Outputs -
2.7
'Low' output voltage
'High' output voltage
+0.4v max at 2.5mA
+3.7v min at -2.5mA.
Digital Input/Output Connections
The three ports of the PPI are all terminated on the rear 37 way D type connector SK1, and use
pin 37 as the digital ground connection. Pin-outs are shown in figure 3.1. A mating D type
connector part number 708 703 92 is available from Amplicon.
2.8
Digital Input/Output Port Addresses
The port addresses for the digital input/output functions are in the range BA to BA + 03, where
BA is the base address set up on the card.
BA + 00:
BA + 01:
BA + 02:
BA + 03:
Port A of QA1/82C55 PPI
Port B of QA1/82C55 PPI
Port C of QA1/82C55 PPI
Control Word for QA1/82C55 PPI
Page 8
PC36AT/LP
The configuration of the three ports and details of the control word are fully explained in
the 82C55 data sheets shown in the appendix.
2.9
Customer-configured Base Address
The base address of the PC36AT/LP can be selected in the hex range 00016 to FFC16. Base
address configuration is accomplished by selecting the appropriate settings of SW1 and SW2
DIL switches. The most significant hex digit is coded by the four most-left switches, and the
middle hex digit is coded by the four most-right switches of SW1. Two poles of SW2 set the
least significant digit to 0, 4, 8 or C. The two right hand poles of SW2 select the required wait
state as explained in paragraph 2.10.
In figure 1, the illustration shows base address 30016 selected. SW1 - 1, 2, 5, 6, 7 and 8 are
switched to '0' (switch on) and SW1 - 3 and 4 are switched to '1' (switch off). SW2 - 1 and 2 are
both '0'. This setting is the factory default configuration, and occupies an area in the PC I/O
map designated for prototype cards. This base address 30016 will suffice for most applications
but paragraph 2.9.1 lists the standard I/O assignments to assist the user in the choice of an
alternative base address if a conflict is likely to occur at 30016.
‘0’
ON
OFF
ON
OFF
1
2
5
6
7
8
800 400 200 100 80
40
20
10
MS
3
4
‘1’
BASE ADDRESS
1
2
3
4
8
4
2
1
LS
WAIT
STATE
This example shows the default base address 30016 and zero wait states selected
FIGURE 2.1
2.9.1
DIL SWITCH BASE ADDRESS SELECTION
PC I/O Map
The standard PC/AT I/O map assignments are listed below. I/O addresses 000 to 0FF16 are
reserved for the PC system board I/O. 100 to 3FF16 are available on the I/O channel.
Hex Range
Usage
1F0-1FF
200-20F
210-21F
238-23B
23C-23F
270-27F
2B0-2DF
2E0-2E7
2E8-2EF
2F8-2FF
300-31F
360-36F
378-37F
Hard Disc (AT)
Game/Control
Reserved
Bus Mouse
Alt. Bus Mouse
Parallel Printer
EGA
GPIB (AT)
Serial Port COM4
Serial Port COM2
Prototype Card
Network
Parallel Printer
Page 9
PC36AT/LP
380-38F
3A0-3AF
3B0-3BB
3BC-3BF
3C0-3CF
3D0-3DF
3E8-3EF
3F0-3F7
3F8-3FF
SDLC
SDLC
MDA
Parallel Printer
EGA
CGA
Serial Port COM3
Floppy Disc
Serial Port COM1
The installation of the PC36AT/LP at a base address that uses unlisted ports may result in
conflicting assignments with other third party adapters.
2.10
Wait-state Generator
The PC36AT/LP incorporates an on-board wait-state generator to enable it to operate in almost
any fast PC compatible that is currently available. This has been made necessary because
some clone manufacturers operate the PC expansion bus at higher clock frequencies than the
accepted 8 MHz.
Many of the integrated circuits currently available cannot operate at these higher frequencies
and so it is necessary to slow down the expansion bus signals, locally, on the PC36AT/LP
board. The slowing down of the expansion bus operating frequency is local to the PC36AT/LP
and will in no way impair the performance of the host machine.
The expansion bus clock frequency should not be confused with the main processor clock
speed. A computer which is specified as a 12, 16 MHz or higher machine could well have an
expansion bus frequency of 8 MHz. Unless explicitly stated in the machine specifications,
there is no easy way to establish the expansion bus speed.
The number of wait states is set up by switch SW2, poles 3 and 4 allowing zero, 1 or 2 wait
states to be selected. If the expansion bus clock frequency for the machine can be established,
use figure 2 to set the appropriate number of wait states. If the expansion bus clock frequency
is unknown, it is suggested that the number of wait states is left at 0. If the operation is erratic,
increase the wait states to 1 or 2 until proper operation is achieved. If the number of wait states
is set too high, the response of the PC36AT will not be optimum. Some computers will not
tolerate wait states on expansion boards, in which case wait states must be left at zero.
TYPICAL
BUS SPEED
0 to 8 MHz
8 to 12 MHz
12 to 16 MHz
NUMBER OF
WAIT STATES
0
1
2
SWITCH SW2
SETTINGS
ON
ON
ON
OFF
OFF
OFF
1
2
3
4
2
1
FIGURE 2.2
1
2
3
4
2
1
1
2
3
4
2
1
WAIT STATE SETTINGS
Page 10
PC36AT/LP
2.11 Interrupt Request Level Selection
There are six Interrupt Request levels available on the PC36AT/LP, IRQ2 - IRQ7 with IRQ2
having highest priority and IRQ7 the lowest priority. The interrupt level is selected by the
position of jumper J1, and, when selected, an interrupt generated by the 82C55 will be sent to
the host computer at that IRQ level.
The interrupt request output is generated by Port C3 and is operable when the 82C55 PPI is
enabled in modes 1 or 2. For a complete description see the data sheets in the appendix.
Figure 3 shows the jumper arrangement for selection of the IRQ level 2 to 7. A jumper may
only be inserted in one position, and the chosen level must not conflict with other devices in the
host computer. Factory default setting is IRQ level 5.
J1
IRQ
2
3
FIGURE 2.3
4
5
6
7
IRQ JUMPER SETTING
To assist the user in choosing a suitable interrupt level, the following table shows the available
levels on the PC36AT/LP and normal usage of all PC/AT hardware interrupts.
PC36AT/LP
Jumper 1
IRQ
Name
Interrupt
Number
–
–
2
3
4
5
6
7
–
–
–
–
–
–
–
–
0
1
IRQ2
IRQ3
IRQ4
IRQ5
IRQ6
IRQ7
IRQ8
IRQ9
IRQ10
IRQ11
IRQ12
IRQ13
IRQ14
IRQ15
8
9
A
B
C
D
E
F
70
71
72
73
74
75
76
77
Usage
Description
Timer
)
Keyboard
)
IRQ 8 - 15
COM2 or SDLC
COM1 or SDLC
LPT
Floppy Disk
LPT
Real Time Clock
Re-directed to IRQ2
Unassigned
Unassigned
Unassigned
Co-processor
Hard Disk
Unassigned
Not available on the
Bus Connectors
)
)
) Not available on
) the PC36AT/LP
)
)
)
)
Page 11
PC36AT/LP
2.12
Installing the PC36AT/LP in the Computer
When the board has been correctly set up for the application as described above, it may be
installed in the host PC.
! CAUTION
ENSURE THAT THE POWER TO THE COMPUTER IS
SWITCHED OFF BEFORE INSTALLING OR REMOVING ANY EXPANSION BOARD.
ALWAYS WEAR AN EARTHED WRIST STRAP AND OBSERVE PROPER PRECAUTIONS
IN HANDLING THE PC36AT/LP AND ANY OTHER BOARDS BEING INSTALLED OR
REMOVED. REPAIR OF DAMAGE CAUSED BY MIS-HANDLING IS NOT COVERED UNDER
THE AMPLICON WARRANTY.
Before installing the PC36AT/LP board in the computer, refer to the hardware manual supplied
with the machine for instructions on how to remove the cover and install devices into an
input/output slot. The PC36AT/LP may be installed in any available slot on the I/O bus
provided that there is no restriction specified for that position by the manufacturer of the
machine.
2.13
Testing the PC36AT/LP
When installation is complete, the PC36AT/LP can be tested using the supplied demonstration
software. See section 4.
2.14
Socketed Integrated Circuits
Of all the components on the PC36AT/LP board, the unprotected integrated circuit associated
with external signals is the most vulnerable to abuse. Incorrect connections, short circuits,
transients or excessive signal levels can occur and cause the interface chip to be permanently
damaged. Such potential problems are recognised, and the susceptible interface IC on the
PC36AT/LP is mounted in a socket, so that if damage is suspected, it can be easily replaced.
The socketed IC is:QA1
82C55
Programmable Peripheral Interface
Normal precautions should be taken when handling the board for IC replacement.
Page 12
PC36AT/LP
3. ELECTRICAL CONNECTIONS
19
DIO Port B7
37
DIG.GND
18
DIO Port B6
36
Not used
17
DIO Port B5
35
Not used
16
DIO Port B4
34
Not used
15
DIO Port B3
33
-12 V Out
14
DIO Port B2
32
Not used
13
DIO Port B1
31
Not used
12
DIO Port B0
30
-5 V Out
11
DIO Port A7
29
Not used
10
DIO Port A6
28
Not used
9
DIO Port A5
27
DIO Port C7
8
DIOPort A4
26
DIO Port C6
7
DIO Port A3
25
DIO Port C5
6
DIO Port A2
View from Rear
(Pins)
24
DIO Port C4
5
DIO Port A1
23
DIO Port C0
4
DIO Port A0
22
DIO Port C1
3
Not used
'DIO Port' refers to theDigital
Input/Output Ports of QA1
21
DIO Port C2
2
+5 V Out
20
DIO Port C3
1
+12 V Out
FIGURE 3.1
3.1
INPUT/OUTPUT CONNECTOR
37 way D-type Connector (SK1 - User Input/Output)
Connections from the PC36AT/LP to the user devices are made via a 37 way D-type
connector. The pin assignments for this connector are shown in figure 3.1.
A mating 37 way female connector is available as a separate item under Amplicon order
code 708 703 92. An external terminal block is also available and requires two items:
37 way Screw Terminal Assembly
37 way, 1 metre Cable
Order Code 908 919 50
Order Code 908 920 05
Page 13
PC36AT/LP
Use of Shielded Cables
In order to maintain compliance with the EMC directive, 89/336/EEC, it is mandatory that the
final system integrator uses good quality screened cables for external connections. It is up to
the final system integrator to ensure that compliance with the Directive is maintained.
Amplicon Liveline offers a series of good quality screened cables for this purpose. Please
contact our sales staff.
3.2
Voltage Outputs Available on SK1
In addition to the 24 digital input/output lines, the PC voltage rails are brought out on SK1,
the I/O connector. These rails are +12, +5, -5 and -12 VDC. No more than 1.0 A should be
drawn from the +5 V rail and no more than 100 mA from each of the other rails. Refer to
the computer technical reference manual for total current availability from the source
power supplies. Some portable computers do not have the ±12 V power supplies available.
3.3
Main I/O Bus Backplane Connections
Connection to the computer is made through the I/O channel main bus 62 Pin Connector. (Pins
B1 and A1 are at the bracket end of the board). Pin connections are shown below. For further
information please consult the technical reference manual for the host computer.
S
O
L
D
E
R
S
I
D
E
Ground
+ Reset
+5 Volts
+IRQ2/9*
-5 Volts
+DRQ2
-12 Volts
-0WS
+12 Volts
Ground
-SMEMW
-SMEMR
-IOW
-IOR
-DACK3
+DRQ3
-DACK1
+DRQ1
-DACK0
CLK
+IRQ7
+IRQ6
+IRQ5
+IRQ4
+IRQ3
-DACK2
+T/C
+BALE
+5 Volts
OSC
Ground
<
<
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>
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>
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B1
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
B14
B15
B16
B17
B18
B19
B20
B21
B22
B23
B24
B25
B26
B27
B28
B29
B30
B31
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
A28
A29
A30
A31
<
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>
>
>
>
>
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-I/O CHCK
SD7
SD6
SD5
SD4
SD3
SD2
SD1
SD0
I/O CHRDY
AEN
SA19
SA18
SA17
SA16
SA15
SA14
SA13
SA12
SA11
SA10
SA9
SA8
SA7
SA6
SA5
SA4
SA3
SA2
SA1
SA0
C
O
M
P
O
N
E
N
T
S
I
D
E
* Note: Pin B4 is IRQ2 for an XT. Pin B4 is IRQ9 for an AT which is re-directed as IRQ2
FIGURE 3.2
MAIN PC BUS BACKPLANE CONNECTOR PIN ASSIGNMENTS
Page 14
PC36AT/LP
4. PROGRAMMING THE PC36AT/LP
4.1
Demonstration Software
The PC36AT/LP is supplied complete with demonstration software written in Borland Turbo
Pascal and BASICA (GWBASIC). The source code for the Turbo Pascal program is supplied,
and is compatible with versions 4 and above. The source code for BASICA is also supplied,
which is compatible with GWBASIC and other variants.
To run the Turbo Pascal program enter PC36AT at the DOS prompt and press <RETURN>.
To run the BASICA program, first load BASICA (or GWBASIC etc), then load PC36AT.BAS
and run in the normal way.
Both programs request the base address for the board. The hardware default address is 30016
which must be entered unless another base address has been set up as described in section
2.9.
The Pascal or BASIC program in use provides two demonstration/test routines which between
them will exercise all 24 bits of the interface.
1.
Test the bits of Port C as input by applying a '1' level to any combination of the
port C input pins and observing the reading on shown on the screen. The '1' level can be
obtained from the +5 volt output on pin 2 of SK1, and for safety this should be applied to
the selected inputs via a 1 kΩ resistor. The unselected port C inputs should be wired to
ground which is '0' level.
2.
Test the bits of Ports A and B as output by setting and resetting the individual bits.
The output levels can be observed on an oscilloscope, or by using a multimeter or wiring
low current LEDs to the pins of interest. The output current from any digital out line must
not exceed 2.5 mA.
4.2
Programming the 82C55
The appendix contains a full set of data sheets on the 82C55 Programmable Peripheral
Interface and sufficient information is included on all the registers and functions to enable an
experienced programmer to fully utilise the functionality of the PC36AT/LP using any language
of choice.
Source code of the Turbo Pascal and BASICA programs is provided on the demonstration
diskette, and any sections of this code may be incorporated in a user's program for use with
Amplicon products.
Page 15
PC36AT/LP
5.
5.1
TECHNICAL SPECIFICATIONS
Electrical Specification
Digital I/O Ports
24 I/O lines arrange as three 8 bit ports (A, B and C). May also be
programmed as two groups of 12 bits (group A, group B) and used in
three modes of operation.
Mode 0:
Mode 1:
Mode 2:
Basic input/output
Strobed input/output
Bidirectional bus
(Group A, group B)
(Group A, group B)
(Group A only)
Digital Inputs
'Low' input voltage
'High' input voltage
-0.3v to +0.8v.
)
+2.2v to +5.3v.
TTL
) compatible
Digital Outputs
'Low' output voltage,
'High' output voltage,
+0.4v max at 2.5mA
+3.7v min at -2.5mA.
User I/O Connector
37 way male D type. 24 digital I\O lines, power and ground.
Address Range
The board is addressable within the range 000-FFC16 at 4 bit
boundaries.
IRQ Range
Port C3 Interrupt can be set to one level in the range IRQ2 to IRQ7.
Power
Powered by +5 Volts from the host PC bus.
PC36AT draws 65 mA or up to 125 mA when all 24 digital output lines
are fully loaded.
PC36LP draws 35 mA or up to 95 mA when all 24 digital output lines
are fully loaded.
The following PC bus voltages are available at the user I/O
connector:
+12 VDC at 100 mA
+5 VDC at 1 A
-5 VDC at 100 mA
-12 VDC at 100 mA
5.2
)
)
)
)
Subject to current being available
from PC power supply.
Physical Specification
Fits half size IBM XT or AT compatible I/O expansion bus slot.
Height
Width
Depth
Weight
Card Only
Packed
107 mm (+22 mm locator tongue)
20 mm
168 mm
0.15 kg
180 mm
80 mm
215 mm
0.3 kg
Page 16
PC36AT/LP
APPENDIX A
CIRCUIT SCHEMATIC AND ASSEMBLY DRAWING
Full circuit diagrams and layout drawings of the PC36AT are given in this appendix. Except
where otherwise noted, the circuit and layout of the PC36LP is identical to the PC36AT.
Drawing number B893160
PC36AT Schematic.
Component Reference
Function
QA1
QA2
QA3
QA4
QA5
QA6
QA7
82C55 User Programmable Peripheral Interface
74LS245 PC bus transceiver
74F521 Base Address comparator
PC36AT
PAL20L8 Programmable Logic Device
PC36LP
GAL20V8 Programmable Logic Device
74HCT174 Wait state generator
74ACT04 Interrupt driver
7417 Open collector driver
SW1
SW2
Base Address set-up switch. Most significant digits
Base Address LSD and wait state set-up switch
RN1, R2
PC36AT
10 kΩ
PC36LP
1 kΩ
Fitted on request
RN2, RN3, RN4
Drawing number B893163
PC36AT Assembly Detail
Jumper J1 shown in default position
Switches SW1 and SW2 shown in default positions after flow soldering
Page 17
PC36AT/LP
PC36at Circuit Diagram
Page I
PC36AT/LP
PC36at Component Layout
Page II