The Asus/Aaeon PFM-550S is a PC/104 CPU module engineered for embedded systems requiring compact form factor, integrated I/O connectivity, and extended temperature operation. Built around a 533 MHz VIA Mark processor paired with VIA Mark + VT82C686B chipset, this module delivers sufficient compute capability for industrial, military, and scientific deployments while maintaining a footprint of 115 mm × 96 mm.
## Technical Specifications
**Processor & Memory**
• VIA Mark 533 MHz processor with VT82C686B chipset
• 144-pin SDRAM SODIMM socket supports up to 512 MB PC-100/133 SDRAM
• 256 KB FLASH ROM BIOS
• Lithium battery with hardware status monitoring (power supply voltages and temperature)
• Watchdog timer with system reset generation
**Display & Graphics**
• VIA VT8606 chipset with up to 32 MB shared system memory
• CRT support: 1280×1024 at 24 bpp
• LCD support: 1024×768 at 18 bpp; 18/24-bit TTL and 18/36-bit LVDS TFT interfaces
• Simultaneous CRT/LCD display capability
**I/O Interfaces**
• Ethernet: Realtek RTL8100BL, 10/100 Base-TX
• Serial: 1× RS-232, 1× RS-232/485
• Parallel port (SPP/EPP/ECP modes)
• USB: 4× USB 1.1 ports via headers and cables
• PS/2 keyboard and mouse connector
• IrDA Tx/Rx header
• EIDE interface (UDMA 33, single device)
• Type I CompactFlash slot
• Floppy Disk Drive connector
• PC/104+ expansion socket
**Power & Environmental**
• +5V/AT or +5V-only operation; typical consumption: +5V @ 2.31 A (533 MHz, 512 MB PC-133)
• Operating temperature: 0°C to 60°C
• Storage temperature: -40°C to 80°C
• Operating humidity: 0% to 90% RH (non-condensing)
• MTBF: 100,000 hours
## Key Features
• Compact 115 mm × 96 mm board for space-constrained installations
• Dual-display support with flexible resolution options
• Mixed serial protocol support (RS-232/485 switching)
• Multiple storage interfaces: EIDE, CompactFlash, floppy
• Integrated real-time monitoring and watchdog functionality
## Compatibility & Integration
Supports WinCE, Linux, WinXPe, and MS-DOS. Optional AC97 audio daughter board (TF-PER-U00A-A12) available for enhanced audio capabilities.
