Board runs Windows, DOS on Mac. (Apple developing add-in board to enable Macintosh Quadra 610, Centris 610 microcomputer to run Microsoft Windows, MS-DOS applications)

LAS VEGAS -- Windows and DOS got the Apple Computer Inc. seal of approval last week, as the company introduced a 486 coprocessor board that runs DOS and Windows applications on the Mac.

Despite a high level of compatibility for basic applications, however, the Quadra 610 DOS-compatible system won't run networking-related software under DOS or Windows.

Using a 25-MHz 486SX from Intel Corp. and special ASICs developed and manufactured by Apple -- including a "communications channel" on the 486 board -- users will be able to switch seamlessly between the DOS/Windows and Macintosh environments.

Users could swap files between the two operating systems without …