Pentium Half-Sized ISA SBC with VGA/LCD Interface Introduction Features � Supports Intel (P54C, P55C/MMX), Cyrix (M1, M2) and AMD The MSC-251AR/MSC-251AL is a full function half-sized (K5, K6) from speed 90 – 233MHz. Pentium ISA bus CPU card. It features a ZIF Socket 7 � AMI PnP BIOS in single Flash ROM with VGA BIOS. that supports various processors – Intel (P54C, � ISA bus and PC/104 bus interfaces. P55C/MMX), Cyrix (M1, M2) and AMD (K5, K6) with � Onboard 256K to 512KB of pipeline Burst cache memory. speed up to 233MHz. � Two 72-pin SIMM sockets supports up to 128MB of either FPM or EDO SIMMs. � External RTC BQ3287A for 10-years data retention. Based on ISA bus architecture that allows upgrading � 16-bit I/O decoding feature and non-loss CMOS setup. 486 ISA system to Pentium environment with no need to � Supports up to four IDE disk drives in Master/Slave change the backplane. Two onboard 72-pin SIMM configuration with PIO mode 5. sockets offer a maximum configuration of 128MB � One integrated floppy diskette drive controller. memory using Fast Page Mode (FPM), Extended Data � Two serial ports that are jumper selectable for RS- Output (EDO) or Bust EDO (BEDO) SIMMs. 232/422/485 data transmission and one multi-mode parallel port. An integrated Flat Panel/CRT SVGA controller with up to � Built-in VGA port and panel interface for up to 1024x768 2MB video memory can support a wide range of flat resolution. panel display up to 800x600 resolution and CRT display � Supports up to 72MB Disk-On-Chip flash disk (optional). � 3-stage watchdog timer. up to 1024x768 resolution. Optional Disk-On-Chip SSD � On-board switching voltage regulator. from M-System with capacity of 2MB and up to 72MB provides excellent storage for vital data. MSC-251 Pentium Half-Sized ISA SBC with LAN/LCD Interface Specifications Dimensions (L x H) Intel P54C/P55C, Cyrix M1/M2, 7.283 x 4.783 inch Main Processor AMD K5/K6 from speed 90 – Operating 0 to 60°C (32 to 140°F) 233MHz Temperature Main Memory Two 72-pin SIMM Sockets support Storage Temperature -20 to +85°C (-4 to 185°F) up to 128MB by using FPM/ EDO/ Humidity 5% to 95%, Non-condensing BEDO SIMMs MTBF 50,000 hours Cache Memory On-board 256KB to 512KB Pipeline Burst SRAM BUS Interface PC/104 and ISA bus System BIOS AMI PnP Flash BIOS Ordering Guide VGA/LCD Features C&T 65550 Chipset with up to 2MB video memory (PCI Bus, MSC-251-AR-BS2 Pentium ISA bus SBC, supports LCD/CRT displays) w/256KB cache and 1MB V- 15-pin connector for 1024x768 DRAM (PC/104 Pin-1 at resolution SVGA monitor right) 50-pin connector for 800x600 MSC-251-AR-BS5 Pentium ISA bus SBC, resolution LCD Panel w/512KB cache and 2MB V- AT Compatible 16-level interrupts Controllers 7 DMA channels DRAM (PC/104 Pin-1 at Watch-dog Timer 3 stage of watchdog timer port right) 1s/10s/30s MSC-251-AL-BS2 Pentium ISA bus SBC, Real-time BQ3287A w/256KB cache and 1MB V- Clock/Calendar 10-year data retention DRAM (PC/104 Pin-1 at 128 byte RAM locations left) * CMOS RAM memory can be MSC-251-AL-BS5 Pentium ISA bus SBC, cleared w/512KB cache and 2MB V- Built-in Connectors Reset switch and key-lock switch DRAM (PC/104 Pin-1 at Hard disk LED left) External speaker All-in-one Features Two EIDE interface ports. Two RS-232/422/285 serial ports M-System Flash Disk-On-Chip Options: please One parallel port (EPP/ECP) One FDC call for details. PS/2 mouse connector Special on-board PC/104 expansion slot Connectors M-System DiskOnChip supports from 2MB to 72MB Keyboard Connectors PS/2 connector and 5-pin shrouded external keyboard connector Power Consumption +5V @3.27A typ. (2-pc of SIMMs) +12V @25mA typ. PCB layer 6-layer PCB design Note: Specification is subject to change without notice.