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Onboard features include one high speed RS-232 serial port, and one
RS-232/422/485 serial port with 16C550 UARTs, one bidirectional SPP/
EPP/ECP parallel port and a floppy drive controller. In addition to the
486's 16 KB of onchip cache memory, the SBC-456/456E includes an
extra 128 KB of L2 onboard cache memory.
If program execution is halted by a program bug or EMI, the board's
watchdog timer can automatically reset the CPU or generate an
interrupt. This ensures reliability in unmanned or standalone systems.
All configuration display and Ethernet (SBC-456E) is done through
software. A single Flash chip holds the system BIOS, VGA BIOS, and
the network boot ROM image. This minimizes the number of chips and
eases configuration. You can change the display BIOS or install a
boot ROM simply by programming the Flash chip.
The SBC-456/456E supports 5 V EDO DRAM. It also provides two 72-
pin SIMM (Single In-line Memory Module) sockets for its onboard
system DRAM. These sockets give you the flexibility to configure
your system from 4 MB to 64 MB of DRAM using the most economi-
cal combination of SIMMs.
• CPU: AMD DX5-133 CPU (SQFP Type)
• Level 2 cache: Onboard 128KB L2 cache
• VGA controller: C&T 65550 with display memory 1MB onboard, 2MB
optional
• DiskOnChip: One 32-pin DIP socket supports the M-Systems
DiskOnchip 2000 series, memory capacity from 2MB to 72MB
• Ethernet interface (SBC-456E): Supports 10Base-T, remote boot ROM
function
Chapter 1 General Information
3
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