Eurosoft Ltd, formerly known as Systems Constructors, has added to its range of XT and 80286 and 80386 AT-alike BIOS products with a new 80486 BIOS that is compatible with OS/2, MS-DOS, and Unix. The company says that 486/AT BIOS supports a range of features including maths co-processors and memory cache, hard and floppy disk drives, display adaptor, input-output options, and the control of CMOS set up. It is compatible with the EISA bus and supports 8-bit, 16-bit, and 32-bit structures. The Bournemouth-based company says that enhancements include 32-bit data transfers between extended and real-mode memory; ROM shadowing of BIOS into 32-bit random access memory; bus master support; EMS 4.0 emulation in extended memory; and support for 47 fixed disk types including those with 4,096 and 1,024 cylinders. 486 BIOS operates at between 6MHz and 45MHz, and soft switching, also known as turbo modes, may be supported from the keyboard. It is available programmed into AT-style ROMs, or as binary files on floppy disks that can be customised to configure BIOS ports, keyboard options, speed switching, and chip-set features. Eurosoft says it will make the source code available to any OEM customers that wish to customise the BIOS to different configurations.
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