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Leading Edge Model D

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The Leading Edge Model D was an IBM clone computer released by Leading Edge Hardware in 1987?.

Hardware

The Model D featured an Intel 8088 microprocessor, with a switch in the back to run at 4.77MHz (normal) or 7.16MHz (high).

It came preinstalled with 512KB of RAM, but was user upgradable to 640KB.

It also featured a monochrome/CGA selection switch, but only had one port. Erroneously, the user's manual showed two ports on the rear panel illustration.

The Model D computers supported a special extended graphics mode, 640x200.

The buyer had the choice between a floppy disk model and a fixed disk (hard disk) model. The floppy disk model had two 360KiB drives, so that the user could run MS-DOS programs on the primary drive and work with files on the secondary drive. The fixed disk model had one 360KiB floppy drive and either a 10MiB or 20MiB hard disk.

Software

The unit came with MS-DOS 3.20, and a special edition of GW-BASIC to support the extended graphics mode.

It also came with a diagnostics disk. This disk contained a diagnostics program, and PARK.COM, a utility used to park the hard drive heads when the computer was to be moved.

The computer supports the Microsoft Windows operating system up to version 3.0, as it is the last version of Windows to support Real Mode.