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    Keith05/12/2024 at 00:55 0 comments

    VSCIM486 80486DX VMEbus/STEbus CPU

    A high-performance single-board solution for DOS, UNIX or real-time applications. VSCIM486 sets the pace in open-architecture bus products for industrial computing, bringing the powerful i486, i486SX and the new i486DX2 CPU to VMEbus in a form which provides unprecedented economy and flexibility to embedded- DOS, UNIX, and real-time systems designers.

    Single Board Solution:

    Everything the 'industrial PC' system designer needs is provided on a single board, allowing many systems to be implemented with at least one VMEbus module less than previous products. The board offers an i486DX2, i486 or the lower-cost 486SX, plus Chips & Technologies' PEAK-DM chipset for 100% compatibility with the PC-AT. In its full configuration, the board may be supplied with 68Mbytes of DRAM (2Mbytes dual- ported), a second-level 256Kbytes SRAM direct-mapped cache, 128Kbytes of battery-backed dual- ported SRAM, EPROM for System/VGA BIOS, a Super-VGA graphics controller with 1Mbyte of 80- nsec video RAM, floppy-disk and IDE hard disk controllers, keyboard interface, COM1/2 serial and LPT1 parallel ports, battery-backed real- time clock and watchdog timer. Various lower population levels are available.

    Ease of configuration:

    Further ways to optimise system configuration are offered by the board's six expansion interfaces - breaking new ground in flexibility for VMEbus designers. In contrast with earlier PC-AT compatible boards, this allows designers to expand functionality over the route best suited to the need - whether the requirement is driven by performance or cost objectives! This is made possible by means of a unique address mapping scheme which dynamically and transparently controls the destination of memory or I/O cycles. In addition to a full VMEbus system interface, users are provided with an optional interface to a secondary I/O bus on the outer rows of the P2 connector; this is actually an interface to STEbus, offering tremendous system flexibility especially for lowering costs in I/O-intensive systems.

    Arcom's mezzanine bus called SCIM - again, an open standard - provides a highly flexible means of incrementally customising functionality - whether it's for I/O or system expansion. Further, I/O from any SCIM module is routed via a connector conforming to the industry-standard Signal- Conditioning Bus. Two routes are available for expanding memory, allowing users to add a high-speed static RAM module for use as a direct-mapped cache, or further system DRAM - up to a total of 64 Mbytes - providing the capacities for most conceivable applications. Tough, industrial orientation: This board is the culmination of years of experience in the industrial computing sector and has been designed for survival in harsh environments. For example, the Local Expansion Bus - SCIM - utilises high- density connectors which provide. strong mounting support and which can be secured for ruggedness - providing an extra dimension of system integrity compared with the flimsy proprietary daughter-module arrangements offered by some.

    Further, I/O from SCIM modules can be routed directly to Eurocard-based real-world interfaces with 19-inch rack-mounting capability and screwdriver-connect terminations. The for industrial applications, matching STEbus interface is similarly designed the quality of the VMEbus itself.


    • 50MHz i486DX2, 25- or 33-MHz i486 or 16- 20- or 25-MHz i486SX single board CPU
    • Up to 68Mb DRAM - 2Mb dual- ported to VMEbus
    • Up to 128Kb battery-backed SRAM (dual-ported to STEbus)
    • Super VGA controller (1024 x 768 in 256 colours)
    • Floppy disk/IDE disk controllers Keyboard, COM1/2 and LPT1 ports
    • Battery-backed real-time clock Watchdog
    • SCIM Local Expansion Bus and Signal Conditioning Bus interfaces
    • STEbus interface (via P2)
    • VMEbus interface
    • All-CMOS construction

    RAM/ROM Silicon disk support for ROM-based PC systems

    The Ultimate Industrial PC

    Wide-ranging potential:

    Depending on the way...

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