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Bobcat (EPM-CPU-3)

Bobcat  (EPM-CPU-3)586 Processor Module

586 Processor Module

PC/104-Plus processor module with 10/100 Ethernet


The Bobcat is OBSOLETE. This data sheet is viewable for reference only from an INTERNAL VERSALOGIC WORKSTATION. It does NOT appear to normal users on our public website.


  • AMD Élan SC520 Processor
    133 MHz 486/586 class CPU.
  • PC/104-Plus Form Factor
    Small footprint. Multi-vendor support.
  • Network Support
    10/100 Ethernet provides fast network access and boot ROM support.
  • Integrated I/O
    Four COM ports (two RS-232, two RS-422/485).
  • DiskOnChip Socket
    Removable non-volatile media has no moving parts and is bootable.
  • System Resets
    VCC sensing reset circuit and Watchdog timer.
  • Multiple Interface
    Floppy, IDE, PC/104 and PC/104-Plus expansion interfaces.
  • Fanless Operation
    No moving parts required for CPU cooling.
  • Customizing Available
    Can be engineered to fit specific application needs.

Software Expertise: Reference & Software Expertise

Embedded PC/104+ Module



The Bobcat single board computer is designed for projects requiring low cost, compact size, high reliability, and long product lifespan / availability. It can be used alone as an Ethernet node processor card or with a plug-in PC/104 video module in applications requiring a video display.

Like all VersaLogic products, this small and efficient SBC is designed to support OEM applications where high reliability and long-term availability are required. From application design-in to 5+ years production life, its quality and longevity provide a cost-effective, long-term solution. Customization is available on as few as 100 pieces. The Bobcat is manufactured and tested to the highest quality standards and is backed by a two year limited warranty.


The board includes 64 MB of low-power system SDRAM which is soldered in place to increase reliability in hostile environments. It also supports bootable DiskOnChip Flash chips to allow program and data file storage without mechanical disk drives.

The high-reliability features of the Bobcat include a watchdog timer, voltage sensing reset circuit, industrial long-life battery, and self-resetting fuse on the 5V supply to the keyboard and mouse.

This exceptional processor card was designed from the ground up for OEM applications with longevity and reliability as the focus. It is fully supported by the VersaLogic application team. Both hardware and software (BIOS) customization are available in 100 unit quantities. Each board is subjected to Environmental Stress Screening and complete functional testing.

The Bobcat is compatible with a wide selection of popular operating systems including most Windows and Real Time OSs. Please contact VersaLogic for more information.

VersaLogic products are designed for use by OEMs working in a variety of market applications: Aerospace, Defense, Energy, Industrial, Security, Medical, Military, Robotics, and Transportation. Anywhere that the need for superb quality and high-performance embedded computing exists, applications include: automation, avionics, gateway, in-vehicle, monitoring, simulation, and vision.

VersaLogic delivers extremely reliable standard and customized embedded computers backed with unsurpassed service and the highest availability in the market. VersaLogic exists to exceed customers' product, service, support and delivery needs - whenever and wherever the need arises.


General Processor AMD Élan SC520
CPU Speed 133 MHz (EPM-CPU-3p,r)
100 MHz (EPM-CPU-3s)
Chipset Integrated
Power Requirements +5.0V ±5% @ .96A (4.8W) typ. (EPM-CPU-3p,r)
+5.0V ±5% @ .86A (4.3W) typ. (EPM-CPU-3s)
System Reset and Hardware Monitors Watchdog timeout.
VCC sensing, resets below 4.7V typ.
Compatibility PC/104 - Refer to reference manual.
PC/104-Plus - Full compliance, 3.3V or 5V modules, PCI 2.2 compliant.
Mechanical Board Size 3.55” x 3.775” (90 mm x 96 mm)
Storage Temperature -40° to +85°C
Operating Temperature 0° to +50°C free air, no airflow (EPM-CPU-3p,r)
0° to +60°C 100 FPM airflow (EPM-CPU-3p,r)
-40° to +75°C free air, no airflow (EPM-CPU-3s)
-40° to +85°C 100 FPM airflow (EPM-CPU-3s)
Thermal Shock 5°C/min over operating temperature.
Vibration, Sinusoidal Sweep 2g constant acceleration from 5 to 500Hz, 20 minutes per axis, MIL-STD-202G, Method 204, Modified Condition A.
Vibration, Random .02g²/Hz (5.35g rms) 15 minutes per axis, MIL-STD-202G, Method 214A, Condition A.
Mechanical Shock 30g half-sine, 11 ms duration per axis, MIL-STD-202G, Method 213B, Condition J.
Humidity Less than 95%, noncondensing.
Memory System RAM 64 MB SDRAM. Soldered on.
Flash Interface One 32-pin JEDEC DIP socket. Accepts battery-backed static RAM chip or M-Systems DiskOnChip. SRAM accessed in 64K blocks.
Network Interface Ethernet* Autodetect 10BaseT/100BaseTX port. Shrouded header.
Network Boot Option Firmware-based Argon Managed Boot Agent. Supports PXE, RPL, NetWare, TCP/IP (DHCP, BOOTP) remote boot protocols.
Device I/O IDE Interface PIO interface with 44-pin 2 mm connector.
COM 1 & 2 Interface* RS-232 compatible, 115K baud max.
COM 3 & 4 Interface* RS-422/485 selectable, 460K baud max.
Floppy Interface Supports one floppy drive.
Other Two general-purpose timer inputs.
AT Peripherals* Keyboard and PS/2 mouse port.
Software Operating Systems Compatible with most x86 operating systems, including Windows 98/NT/CE, QNX, VxWorks, and Linux.
BIOS General Software’s Embedded BIOS with OEM enhancements. Field reprogrammable. User-configurable CMOS defaults.

*TVS protected port (Enhanced ESD protection).
‡ Power pins on this port are protected with a self-resetting fuse.

Data represents standard operation at 25°C with 5.0V supply unless otherwise noted. Specifications are subject to change without notice. PC/104 and PC/104-Plus are trademarks of the PC/104 Consortium.

Software Support Packages

Linux Redhat

Wind River VxWorks

Operating System Compatibility

Win XP - Not Compatible
Win XPe - Not Compatible
Win CE - Meets Specifications
Debian - Meets Specifications
VxWorks - Meets Specifications
Neutrino - Meets Specifications
DOS - Tested & Compatible