Ampro Corporation 486E manual Floppy Disk Interface, Floppy Drive Considerations

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Product Reference

Floppy Disk Interface

The onboard floppy disk controller and ROM BIOS support one or two floppy disk drives in any of the standard DOS formats shown in Table 2–22.

Table 2–22. Supported Floppy Formats

Capacity	Drive Size	Tracks	Data Rate

360K	5-1/4 inch	40	250 kHz

1.2M	5-1/4 inch	80	500 kHz

720K	3-1/2 inch	80	250 kHz

1.44M	3-1/2 inch	80	500 kHz

Floppy Drive Considerations

Nearly any type of soft-sectored, single or double-sided, 40 or 80 track, 5-1/4 inch or 3-1/2 inch floppy disk drive is usable with this interface. Using higher quality drives improves system reliability. Some considerations about the selection, configuration, and connection of floppy drives to the Little Board/486e CPU include:

!Drive Interface—The drives must be compatible with the board’s floppy disk connector signal interface, as described below. Ampro recommends any standard PC-or AT-compatible 5-1/4 inch or 3-1/2 inch floppy drive.

!Drive Quality—High quality DC servo direct drive motor floppy disk drives must be used.

!Drive Select Jumpering—Jumper both drives for the second drive select (standard on PC drives).

!Floppy Cable—For systems with two drives, a floppy cable with conductors 10-16 twisted between the two drives must be used. This is standard practice for PC-compatible systems.

!The Little Board/486e CPU has a 2mm floppy port connector. The development kit contains an adapter board and a 2-mm cable that can connect the floppy drive to the Little Board/486e CPU. The adapter board has an additional connector that can connect a second floppy drive.

!Drive Termination—Resistive terminations should be installed only on the drive connected to the last interface cable connector (farthest from the board). Near-end cable termination is provided on the Little Board/486e CPU.

!Head Load Jumpering—When using drives with a Head Load option, the drive must be jumpered for head load with motor on rather than head load with drive select. This is the default for PC-compatible drives.

!Drive Mounting—If a floppy drive is mounted very close to the Little Board or another source of electromagnetic interference (EMI), a thin metal shield may need to be placed between the disk drive and the device to reduce the possibility of EMI.

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Contents Little Board/486e Computer Revision Reason for Change Date Table of Contents Page Technical Specifications Index Technical Support IntroductionThis page left intentionally blank Viii CPU/Motherboard FeaturesChapter General DescriptionVL-Bus Flat Panel/CRT Display Controller Enhanced Embedded-PC BiosIDE Interface Serial PortsEnhanced Parallel Port Floppy InterfaceByte-Wide Socket and Solid State Disk SSD Ethernet LAN InterfaceModular PC/104 Expansion Bus Enhanced ReliabilityHalt Testing Software Little Board Development Platform Overview Interface Connector SummaryConnectors Connector Function Size Key PinConnector and Jumper Locations Jumper Group Function Default Jumper Configuration OptionsSystem I/O Map Address Function Connector Type Mating Connector DC PowerPin Connection Backup Battery Power RequirementsCooling Requirements Powerfail Monitor System Memory Map DramMemory Address Function Expanded Memory and Extended MemoryAddresses Serial Ports J11, J13RS-232C Serial Ports RS-485 Serial PortIRQ11 IRQ7 Interrupt AssignmentsSerial Port Connectors J11, J13 ROM-BIOS Installation of the Serial PortsName Pin Ports Pin Signal Function In/Out DB25Pin Signal Name Configuring Serial 2 for RS-485 J6, W5, W6Pin RJ11 Signal Standard Wire Color RS-485 Twisted-Pair Cabling Using RJ11 ConnectorsInterconnection Scheme Examples Using the RS-485 InterfaceSerial Console Hex CommandSerial Handshake COM Port TableUsing a Serial Modem Serial Booting and Serial ProgrammingRegister Name Address Primary Secondary Bi-Directional Parallel PortSelection Address Interrupts Signal Type Number of Lines Function Output Drive ROM-BIOS Installation of Parallel PortsStandard and General Purpose I/O Operation Parallel Port Interrupt Register Bit Signal Name In/Out Active J15 Parallel Port Interrupt EnableOr Function High/Low Pin J15 Pin Signal Function In/Out DB25 Name Parallel Port Connector J15Register Bit Definitions Signal Name Full Name DescriptionFloppy Drive Considerations Floppy Disk InterfaceCapacity Drive Size Tracks Data Rate Floppy Interface Connector J14 Floppy Interface ConfigurationPin Signal Name Function In/Out IDE Hard Disk Interface IDE Connector J1225. IDE Drive Interface Connector J12 IDE Interface Configuration Solid-State Disk Preparation Master/Slave SettingCompact Flash Solid-State Disk Enabling the DriveName Connector Pins/Type Description Connecting a CRT J5Flat Panel/CRT Video Controller Part Description Mating Connector J5 Pin Signal Name DB-15 DB-9W10 +5V Connecting a Flat Panel J3FLM Pin Signal Description NameAdvanced Power Management Power SequencingPgmebios VIDEO=filename Bios Support of Non-Standard PanelsLCD Bias Supply Option Selecting Vee PolarityJ4 Pin J3 Pin Description Ra = 270 Rb = Vee max Vee min / 1.5 Attaching an External Contrast ControlExample Network Terms Ethernet Network InterfaceQNX Installing an Ethernet Boot PromTwisted Pair Interface J7 Twisted-Pair InstallationsInstalling a Boot Prom Installing a Boot Prom in Byte-Wide Socket S0Using Network Operating Systems NOS Controlling the Ethernet LAN Interface Directly Network OS DriversProgram Name Vendor Function Driver Name 00 40 Manufacturer’s Ethernet IDByte-Wide Socket S0 SSD Device Size Package Generic Type Pins Part NumberAddressing the Byte-wide Socket ROM-BIOS ExtensionsWindow Address Performance Issues Accessing the Byte-Wide SocketSolid State Disk SSD Drives Device 64KB Segment Address Size Segments Upper Nibble of BH Jumpering the Byte-Wide Socket Byte-Wide Socket SignalsTypical Devices Pins Jumper Diagram W14 Pin Signal Name DescriptionFlash Eprom Typical Devices Pins Jumper Diagram Using EPROMsFlash Eprom Programming Non-volatile RAM Using SRAMsUtility Connector J16 Exsmi Pin Signal Name FunctionLED Connection Push Button Reset ConnectionExternal Battery Connections PC SpeakerBattery-Backed Clock Jumper W4 Watchdog TimerWDT Response AL,61H AL,NOT 08H OUT 61H,AL Page AT Expansion Bus Onboard MiniModule Expansion Using Standard PC and AT Bus CardsBus Termination Bus Expansion GuidelinesExpansion Bus Connector Pinouts PU/PD/S Pin Signal Function In/Out Current47. AT Expansion Bus Connector, B1-B32 P1 48. AT Expansion Bus Connector, C0-C19 P2 PU/PD/S Interrupt Function Interrupt and DMA Channel UsageSerial Parallel Floppy Channel FunctionEthernet Video Setup Overview Menu Name Functions Standard CMOS/EEPROM Setup Setup Page 1-Standard CMOS/EEPROM SetupIDE Hard Disk Drives Drive Parameter SetupDate and Time Floppy DrivesPage System Post Error HaltVideo Dram MemoryExtended Bios Setup Page 2-Options/Peripheral ConfigurationSelection Address Interrupt Serial PortParallel Port Port AddressSelection Address Floppy Interface EnableIDE Interface Enable Hot Key Setup EnableBlank Post Test Video StateLocal Bus Video Display Byte-Wide Socket ConfigurationSerial Boot Loader Enable Watchdog Timer ConfigurationFlat Panel Display Type Installing a Modified Bios to Support a New PanelExtended Serial Console Configuration Setup Page 3-Serial Console ConfigurationPage Switch Function Creating Configuration Files with SETUP.COMDIR LPT1 Operation with DOSUtility Software Overview Embedded-PC System Enhancements Little Board/486e CPU SpecificationsOnboard Peripherals CRT Support for Standard Video Modes Vesa Font Pixels Clock Horiz Vert Mem Mode MHz KHz Support Software Mechanical and Environmental Specifications Mechanical Dimensions Technical Specifications Page Index Page POST, Setup Little Board/486e Technical Manual Index-4