FabiaTech Low Power FB2503 User manual

FabiaTech Corporation
IPC Solution
Website: http://www.fabiatech.com
Email: [e-mail]
ISA CPU Card
Low Power Series
FB2503 User’s Manual
SEP 2006
Version: 1.0
Part Number: FB2503

ii
Copyright
Copyright © 2006 FabiaTech Corporation. The content of this publication may not be
reproduced in any part or as a whole, transcribed, stored in a retrieval system, translated
into any language, or transcribed in any form or by any means, electronic, mechanical,
magnetic etc. or otherwise without the prior written permission of FabiaTech Corporation.
Disclaimer
FabiaTech makes no representation of warranties with respect to the contents of this
publication. In an effort to continuously improve the product and add features,
FabiaTech reserves the right to revise the publication or change specifications contained
in it from time to time without prior notice of any kind from time to time.
FabiaTech shall not be reliable for technical or editorial errors or omissions, which may
occur in this document. FabiaTech shall not be reliable for any indirect, special, incidental
or consequential damages resulting from the furnishing, performance, or use of this
document.
Trademarks
Trademarks, brand names and products names mentioned in this publication are used for
identification purpose only and are the properties of their respective owners.
Technical Support
If you have problems or difficulties in using the system board, or setting up the relevant
devices, and software that are not explained in this manual, please contact our service
engineer for service, or send email to suppo[email protected].
Returning Your Board For Service & Technical Support
If your board requires servicing, contact the dealer from whom you purchased the
product for service information. You can help assure efficient servicing of your product by
following these guidelines:
 A list of your name, address, telephone, facsimile number, or email address where
you may be reached during the day
 Description of you peripheral attachments
 Description of you software (operating system, version, application software, etc.)
and BIOS configuration
 Description of the symptoms (Extract wording any message)
For updated BIOS, drivers, manuals, or product information, please visit us at
www.fabiatech.com

iii
TableofContent
FB2503 User’s Manual......................................................................................................................... i
Table of Content .........................................................................................................................................iii
Chapter 1 Introducing the FB2503 System Board ...................................................................................1
Overview..................................................................................................................................................1
Layout.......................................................................................................................................................2
Specifications..........................................................................................................................................3
Packing List..............................................................................................................................................4
Chapter 2 Hardware Installation............................................................................................................... 5
Before Installation...................................................................................................................................5
Hardware Features ................................................................................................................................6
J17: CPU Fan Connector ..................................................................................................7
J5: Reset Header................................................................................................................7
J10: Power/Watchdog LED Header ...............................................................................7
J2: HDD LED Header ..........................................................................................................8
CN10, CN11: Keyboard/Mouse Connector..................................................................8
J14: USB Connector ...........................................................................................................9
CN8: RJ45 LAN Connector ...............................................................................................9
CN3, CN1: IDE hard Disk Connector.............................................................................10
DB2, CN6: RS232 Serial Ports 1,2 Connectors and Jumpers .....................................11
J6: Temperature Sensor Header....................................................................................13
CN7: 26-pin Parallel Port Connector ............................................................................13
CN2: Floppy Connector..................................................................................................14
BZ1& J12: On-Board Buzzer & External Speaker Header ..........................................14
J4 & JP2: External Battery Connector and Battery Select Jumper.........................15
On-Board Power and Watchdog LED (LED1).............................................................15
J16: Power Connector (6-pin 2.5mm JST)....................................................................16
J3, J15 & JP3: Soft Start Connector (for ATX Power Supply Only)...........................16
J11: TTL I/O Connector....................................................................................................17
DIMM1: SoDIMM Socket..................................................................................................17

iv
J18 & JP1: Compact Flash Socket and Master/Slave Select...................................17
J13: AMR Connector .......................................................................................................18
BUS1: PC/104 Connector................................................................................................18
Chapter 3 Installing CRT & LVDS LCD...................................................................................................... 21
LCD FLAT PANEL DISPLAY....................................................................................................................21
CRT & LCD DISPLAY..............................................................................................................................22
CN9, CN5 & CN4: LCD Connector and Power connector......................................23
Chapter 4 BIOS Setup............................................................................................................................... 25
Overview................................................................................................................................................25
BIOS Functions............................................................................................................................26
Keyboard Convention..............................................................................................................27
STANDARD CMOS SETUP .....................................................................................................................28
ADVANCED CMOS SETUP ...................................................................................................................30
ADVANCED CHIPSET SETUP.................................................................................................................35
POWER MANAGEMENT .......................................................................................................................39
PCI/PLUG AND PLAY............................................................................................................................42
PERIPHERAL SETUP.................................................................................................................................45
Hardware Monitor Setup ....................................................................................................................48
Password Setup ....................................................................................................................................49
Chapter 5 Driver and Utility ..................................................................................................................... 51
VIA 4 In 1 Driver.....................................................................................................................................51
WIN 98/2000/XP Driver..............................................................................................................51
VGA Driver for WIN98/ME ...................................................................................................................52
Audio Drivers .........................................................................................................................................53
WIN 98_ME/WINXP_2K Driver ...................................................................................................53
BIOS Flash Utility.....................................................................................................................................53
LAN Utility ...............................................................................................................................................53
Watchdog Timer...................................................................................................................................54
Watchdog Timer Setting ..........................................................................................................55
Watchdog Timer Enabled........................................................................................................56
Watchdog Timer Trigger...........................................................................................................56
Watchdog Timer Disabled.......................................................................................................56
Programming RS-485............................................................................................................................57
Chapter 6 Technical Reference.............................................................................................................. 61

v
Trouble Shooting for Error Messages.................................................................................................61
Technical Reference...........................................................................................................................64
Real-Time Clock and Non-Volatile RAM...............................................................................64
CMOS RAM Map .......................................................................................................................66
I/O Port Address Map...............................................................................................................67
Interrupt Request Lines (IRQ)...................................................................................................68
DMA Channel Map...................................................................................................................69
DMA Controller 2.......................................................................................................................69
Serial Ports...................................................................................................................................70
Parallel Ports ...............................................................................................................................74
Appendix................................................................................................................................................... 77
A: Dimension .........................................................................................................................................77
B: SRAM ..................................................................................................................................................78
SRAM memory banks ......................................................................................................79

1
Chapter1IntroducingtheFB2503SystemBoard
Overview
The FB2503 is a VIA Mark Low power processor, all in one, half-size ISA CPU card. This
user’s manual provides information on the physical features, installation, and BIOS
setup of the FB2503.
Built to unleash the total potential of the VIA Mark Core FusionProcessor, the FB2503
is a single boards computer capable of handling today’s demanding requirements.
Able to support 533Mhz ~800MHz CPUs, this unit supports 10/100M interface network
port, synchronous pipeline burst SDRAM up to 578MB and a onboard VGA port up to
32MB share memory that can support TTL/LVDS LCD’s and CRT’s simultaneously or
independently.
Each FB2503 has two ports for I/O communications. One RS-232C and one RS-232
/422/485 ports are available. There is also a watchdog timer that can be configured
from software to automatically reset the system or generate an interrupt if there is a
system’s or EMI problem. And for easy configuration, AMI BIOS are available.
Power management is also featured to lower the rate of consumption. The unit
supports doze mode, <Suspend Mode> and <Standby mode> as well as it adheres to
the “Green Function” standard.
The FB2503 is perfect for POS and POI applications, network systems, panel / MMI’s,
order entry kiosks, test equipment, OEM projects or as a motherboard for a panel PC.
The unit is only 185X122mm, offering unparalleled performance in a very small footprint.

FabiaTech Corporation
2
Layout
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
J18 DIMM1

FabiaTech Corporation
3
Specifications
 Onboard 533Mhz VIA Mark Core FusionLow Power CPU.
 VIA Mark Core Fusion+VT82C686B chipset.
 Compact size slot card with ISA expansion bus.
 On-board 64MB SDRAM and 1 So-DIMM socket for up to 576MB maximum.
 100M/10M Ethernet with RJ-45 connector.
 Onboard VGA port (VIA Mark Core FusionIntegrated ProSavage4 Graphic)
supports CRT and LVDS with up to 32MB shared memory.
 Parallel port, floppy and support two Enhanced IDE channels.
 One RS-232 and One RS-232/RS-422/RS-485/IrDA.
 PS/2 compatible keyboard and mouse interface.
 Compact Flash socket for 3.3V Compact Flash and Micro Drives.
 On-board buzzer and LED indicator.
 Software programmable watchdog timer.
 Two USB ports and hardware monitoring functions.
 Provides two CPU & case cooling fan connector for monitoring.
 Provides One AC97 and One feature connector for Audio function. (Optional).
 Flash BIOS with easy upgrade utility.
 Compact size, 185 mm x 122 mm.

FabiaTech Corporation
4
PackingList
Upon receiving the package, verify the following things. Should any of the mentioned
happens, contact us for immediate service.
• Unpack and inspect the FB2503 package for possible damage that may occur
during the delivery process.
• Verify the accessories in the package according to the packing list and see if
there is anything missing or incorrect package is included.
• If the cable(s) you use to install the FB2503 is not supplied from us, please make
sure the specification of the cable(s) is compatible with the FB2503 system
board.
Note: after you install the FB2503, it is recommended that you keep the diskette or
CD that contains drivers and document files, document copies, and
unused cables in the cartoon for future use.
The following lists the accessories that may be included in your FB2503 package.
Some accessories are optional items that are only shipped upon order.
• One FB2503 system board
• One compact disc containing manual file in PDF format and necessary
drivers and utilities
• One 40-pin hard disk drive interface cable
• One 34-pin floppy drive interface cable
• One serial port and parallel port interface cable with bracket
• One mouse port adapter cable with bracket
• One hard copy of Quick Installation Guide
• One 2-port USB adapter cable (Optional)

FabiaTech Corporation
5
Chapter2HardwareInstallation
To set up a FB2503 system board, complete the description Chapter 2 and Chapter 3.
This chapter introduces the system board connectors, jumper settings and then guides
you to apply them for field application.
BeforeInstallation
Before you install the system board, make sure you follow the following descriptions.
1. Before removing the board from its anti-static bag, wear an anti-static strap to
prevent the generation of Electricity Static Discharge (ESD). The ESD may be
created from human body that touches the board. It may do damage to the
board circuit.
2. Install or unplug any connector, module, or add-on card, be sure that the power is
disconnected from the system board. If not, this may damage the system board
components, module, or the add-on-card.
3. Installing a heat sink and cooling fan is necessary for heat dissipation from your
CPU. If heat sink or cooling fan is not mounted, this may cause the CPU fail due to
over-heating problem.
4. When you connect the connectors and memory modules, be careful with the pin
orientations.

FabiaTech Corporation
6
HardwareFeatures
The following lists the connectors and jumpers to install the FB2503.
Item Description
CN1 44-pin 2.0mm IDE 2 hard disk connector (IDC).
CN2 34-pin 2.54mm floppy connector (IDC).
CN3 40-pin 2.54mm IDE 1 hard disk connector (IDC).
CN4 For Inverter connector (JST)
CN5 LCD Connector with 36 bit LVD signals (DF13)
CN6 10-pin RS-232 port 2 connector (IDC)
CN7 26-pin 2.0mm parallel port connector (IDC)
CN8 RJ45-Lan connector
CN9 LCD Connector with 24 bit TTL signals (DF13)
CN10, CN11 Keyboard and Mouse connector
J1 3-pin touch screen header for serial port 2
J2 2-pin HDD LED Indicator header
J3 ATX soft power switch header
J4 2-pin External battery header
J5 2-pin Reset header
J6 2-pin for external temperature sensor header
J7 Reserved
J8 5-pin RS232C IrDA header for serial port 2
J9 2-pin for external TX-LED header with LAN
J10 2-pin Power and watchdog header of LED indicator
J11 5-pin for TTL I/O (JST)
BZ1, J12 Onboard Buzzer and external speaker header
J13 AMR connector for provides AC97 signals for Audio and Modem functions
J14 10-pin USB connector
J15 Control signal for ATX power supply only
J16 6-pin power connector (JST)
J17 3-pin for case/CPU cooling fan t
J18, JP1 Compact Flash Socket and Master/Slave Select
JP2 To clear CMOS data
JP3 ATX and Non-ATX Select
DB1 CRT connector
DB2 RS232 9-pin D – type male connector
LED1 Power and watchdog of LED indicator
SW1 To selects RS422/RS485 and Terminator for serial port 2 and Memory Bank Select
BUS1 PC104 BUS Connector
DIM1 SDRAM So-DIMM Socket

FabiaTech Corporation
7
 J17: CPU Fan Connector
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 J5: Reset Header
J5 is a 2-pin header for connecting to system reset bottom. Short-circuit these 2 pins to
hardware reset FB2503 as well as restart system. It is similar to power off the system and
then power it on again.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 J10: Power/Watchdog LED Header
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
J17 Description
1 Ground
2 +12V
3 Speed-In
Pin1 Reset +
Pin2 Reset -
Pin 1 Power/Watchdog LED +
Pin 2 Power/Watchdog LED -
1
2
J10
3
1
J17
J5
2
1

FabiaTech Corporation
8
 J2: HDD LED Header
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 CN10, CN11: Keyboard/Mouse Connector
CN11 is a standard PS/2 type keyboard connector, so any PS/2 type keyboard can
plug into directly without extra adapter cable. CN10 provides PS/2 mouse interface,
use the included mouse adapter cable to connect between CN10 and standard PS/2
mouse.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
12
34
56
Pin1
Pin2
Hard Disk LED+
Hard Disk LED-
CN11 Front View
CN10 CN11 Signal
1 2 Mouse Data
2 1 Keyboard Data
3 3 Ground
4 4 VCC
5 6 Mouse Clock
6 5 Keyboard Clock
CN10
6
1
1
2
J2

FabiaTech Corporation
9
 J14: USB Connector
J14 is a 10-pin connector. Use included adapter cable (Optional) for transfering to
standard double port USB connector. The upper port is USB #0 and the lower port is
USB#1
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 CN8: RJ45 LAN Connector
The CN8 contain LAN twist pair signals and LAN accesses indicator signal is RJ45 type
connector with 2 LED indicators. The down side LED (orange) indicates data is
accessing and the up side LED (green) indicates on-line status. (When lighted indicates
on-line and off indicates off-line).
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
RJ45
Signal RJ45 Signal
1 TPTX+ 5 FBG1
2 TPTX - 6 TPRX -
3 TPRX+ 7 FBG2
4 FBG1 8 FBG2
The following lists the pin assignment of RJ45.
CN8
(Front View)
1
8
J14 Signal J14 Signal
1 USBV0 2 Case Ground
3 USBD0- 4 USBG1
5 USBD0+ 6 USBD1+
7 USBG0 8 USBD1-
9 Case Ground 10 USBV1
J
14
10
2
9
1

FabiaTech Corporation
10
 CN3, CN1: IDE hard Disk Connector
CN3 is 40-pin 2.54mm IDE hard disk connector. CN1 is 44-pin 2.0mm IDC connectors.
The IDE interface has two enhanced IDE channels and supports 4 IDE devices with ultra
DMA 33 and or IDE channel 1 IDE supports ultra DMA 33/66/100.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 Caution: If you use ULTRADMA/66/100 devices, you will need to purchase
another UltraDMA/66/100 cable. UltarDMA/66/100 IDE devices must use a 40-
pin 80-conductor IDE cable. (See P44 PERIPHERAL SET UP)
The following table lists the pin description of CN3, CN6.
Pin Signal Pin Signal
1 -RESET 2 GROUND
3 DATA7 4 DATA8
5 DATA6 6 DATA9
7 DATA 5 8 DATA 10
9 DATA 4 10 DATA 11
11 DATA 3 12 DATA 12
13 DATA 2 14 DATA 13
15 DATA 1 16 DATA 14
17 DATA 0 18 DATA 15
19 GROUND 20 NOT USED
21 IDEDREQ 22 GROUND
23 -IOW A 24 GROUND
25 -IOR A 26 GROUND
27 IDEIORDYA 28 GROUND
29 -DACKA 30 GROUND
31 AINT 32 GROUND
33 SA 1 34 Not Used
35 SA0 36 SA2
37 CS 0 38 CS 1
39 HD LED A 40 GROUND
41 (CN1) VCC 42 (CN1) VCC
43 (CN1) GROUND 44 (CN1) Not Used
CN3 – Hard disk connector
40
39
2
1
CN1 – Hard disk connector
1
43
2
44

FabiaTech Corporation
11
 DB2, CN6: RS232 Serial Ports 1,2 Connectors and Jumpers
The DB2 connector on bracket is 9-pin D-type male connector the serial port 2
adapter cables are used to transfer 10-pin IDC connector into standard DB9
connectors.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 Serial Port 2 (CN6, SW1, J1, J8 and SW1)
Serial port 2 is designed for multiple proposes. It could be RS-232C, RS-422 or RS-485 by
selecting SW1 or changing the setting in BIOS setup program, and SW1-4 is use to
enable or disable terminator if RS-485 mode is selected. Serial port 2 also could be
configured as Infra (IrDA) interface by changing the setting in BIOS setup program. J8
is use to interface with Infra module. When touch screen module is used, you could
connect J1 to touch screen controller directly and internally instead of connect from
CN6 connector.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
SW1-4 Terminator (422/485)
Off Off
On On
SW1-2 SW1-3 Signal
Off Off RS-232
On Off RS-422
On On RS-485
Off On Reserved
9
10
CN6
1
2
OFF
ON
SW1
4
1
2
3
DB2
9
1
56
Factory Preset: Off
Factory Preset: RS232

FabiaTech Corporation
12
 J8: 5-pin Infrared Header
J8 provides infrared signals of serial port 2. The infrared signal is used to interface with
Infrared modules.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 J1: Touch Screen Header
J1 provide basic RS-232C signals of serial port 2 respectively. The basic RS-232C signal is
used to interface with touch screen controller internally.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
CN6 Signal RS422 RS485 DB9
1 -DCD2 1
2 -DSR2 6
3 RXD2 RX- 485- 2
4 -RTS2 TX- 7
5 TXD2 RX+ 485+ 3
6 -CTS2 TX+ 8
7 -DTR2 4
8 -RI2 9
9 GROUND 5
10 CASE GROUND
Pin 1: VCC
Pin 2: N.C.
Pin 3: IRRX
Pin 4: Ground
Pin 5: IRTX
Pin 1: TXD
Pin 2: RXD
Pin 3: Ground
5
1
J8
3
1
J1

FabiaTech Corporation
13
 J6: Temperature Sensor Header
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
 CN7: 26-pin Parallel Port Connector
The included printer interface cable is used to transfer 26-pin connector into standard
DB25 connector.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
CN7 DB-25 Signal CN7 DB-25 Signal
1 1 -STROBE 2 14 -AUTOFORM FEED
3 2 DATA0 4 15 -ERROR
5 3 DATA 1 6 16 -INITIALIZE
7 4 DATA 2 8 17 -PRINTER SELECT IN
9 5 DATA 3 10 18 Ground
11 6 DATA 4 12 19 Ground
13 7 DATA 5 14 20 Ground
15 8 DATA 6 16 21 Ground
17 9 DATA 7 18 22 Ground
19 10 -ACKNOWLEDGE 20 23 Ground
21 11 BUSY 22 24 Ground
23 12 PAPER 24 25 Ground
25 13 PRINTER SELECT 26 -- No Used
Resistive Temperature
Sensor Input Header
J6
_
+
CN7
26
25
2
1

FabiaTech Corporation
14
 CN2: Floppy Connector
The included floppy drive interface cable is used standard 34-pin connector. The
following table shows signal connections 34-pin connectors.
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
34-pin Signal 34-pin Signal
2 Drive Enable A 23 Ground
8 -Index 24 -Write Enable
12 -Select A 26 -Track 0
11 Ground 28 -Write Protect
16 -Motor A 29 Ground
14 - Select B 30 -Read Data
10 -Motor B 31 Ground
9 Ground 32 -Head
18 -Direction 33 NC
20 -Step 34 -Disk Change
22 -Write Data Others No Connection
 BZ1& J12: On-Board Buzzer & External Speaker Header
CN2 CN3 CN1
DB1
CN8
DB2
CN11
J2 J3
J5 J6
J9J10
J4
J1
CN6
JP2
J12
JP1
CN5
J7
J8
CN7
LED1
J13
J14
BUS1
J15 CN10JP3J16 J17
SW1
CN9
U9
J11
CN4
BZ1
PIN Signal
1 Speaker+
2 Speaker-
3 Speaker-
4 Speaker-
J12 External Speaker Header
CN2 –Floppy connector
34
33
2
1
1
4