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The IBM PC AT was the company's second-generation personal computer and was announced in 1984.
The machine was initially powered by an Intel 286 processor running at 6MHz, while later models ran at 8MHz.
The PC AT could support up to 16MB of RAM and initially had one 20MB hard drive. Expansion was via six 16-bit expansion slots and two 8-bit slots.
The display was usually driven by an IBM monochrome Display/Printer adapter or an IBM Colour/Graphics Adapter. Machines released later used the IBM Enhanced Graphics Adapter and, sometimes, Professional Graphics Adapters.
IBM produced a number of point of sale terminals, such as this 1985 IBM 4683 machine.
The 4860 system consists of a PC-based controller and thin client-based POS terminal, typically connected via a Token ring network.
The lightweight, for the time, IBM PC Convertible can be considered to be IBM's first laptop.
Released in 1986 the machine used a 4.77MHz Intel 8088 processor and came with up to 256KB of RAM, expandable to 640KB.
It came with a monochrome CGA-compatible LCD screen and twin 720KB 3.5-inch floppy disk drives.
In total the machine weighed less than 13 pounds or 6kg, thanks in part to its use of the latest surface mount technology to allow more components to be packed into a smaller area.