3–2
− 512 bits available for OEM use
! Watchdog Timer
− Selectable Timeout: 30 seconds / 60 seconds / 90 seconds / Disabled
− Timeout triggers hardware reset
! Powerfail NMI triggers when +5 Volt power drops below +4.7 Volts.
On-board Peripherals
This section describes standard peripherals found on every Little Board/P5x.
! Four buffered serial ports with full handshaking
− Implemented with 16550-equivalent controllers with built-in 16-byte FIFO buffers
− On-board generation of RS-232C signal levels
− Serial 1 supports either RS-232C or RS-485
− Logged as COM1, COM2, COM3, and COM4 by DOS
− Serial 1/Serial 3 and Serial2/Serial4 share interrupts (IRQs)
! Multi-mode Parallel Port
− Superset of standard LPT printer port
− Bi-directional data lines
− IEEE-1284 (EPP/ECP) compliant
− Standard hardware supports all four IEEE-1284 protocol modes
− Internal 16-byte FIFO buffer
− DMA option for data transfers
! Floppy Disk Controller
− Supports one or two drives
− Reliable digital phase-locked loop circuit
− BIOS supports all standard PC/AT formats: 360K, 1.2M, 720K, and 1.44M
! PCI EIDE Disk Controllers
− PCI bus implementation of Extended IDE (EIDE) hard disk controllers (2)
− Supports up to four hard disk drives.
− Fast ATA-capable interface supports high-speed PIO modes
− BIOS supports drives larger than 528 M bytes through Logical Block Addressing (LBA)
− Supports Compact Flash interface
! PCI UltraSCSI Interface
− ANSI X3.131-compliant
− Uses the Adaptec AIC 7860 controller
− Synchronous or asynchronous data transfer