IBM added a lot of new features: they abandoned the old Intel 8086 to the Intel 80286, so the PC AT used new 16 bit expansion slots.

The IBM PC AT was the successor of the PC and the XT.

But one thing let to Assembling my own custom IBM PC XT clone! The Monotech NuXT is an Intel 8088 motherboard.

Here's a Datatech IBM XT clone I got because I needed the 360K floppy drives.

The company’s first effort of tapping into the microcomputer market was the IBM 5100, which is a complete model that has a mouse, a keyboard, a monitor, and massive data. Seeing that the computer industry is slowly transitioning to favor smaller machines, IBM decided that they should start making microcomputers. Although the XT provided eight expansion slots, they were typically filled with extra RAM, a real time clock, parallel, and serial port cards, floppy and hard disk controller cards, and a video card.

IBM XT Motherboard Typically this was the board form factor and design to clone.

The BIOS was originally built using IBM MASM 2.0.

IBM PC XT BIOS dated 05/09/86 based on the BIOS listings in the IBM PC XT Technical Reference dated March 1986 and code disassembly.

Analysts said the new computer seemed to be a collection of existing components at a lower price rather than a technological breakthrough. The machine resembles IBM's top-of-the-line AT in many respects, but ischeaper.

IBM's new XT Model 286 can operate three times as quickly as earlier models of the XT in most applications, the company said.

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