PGA meaning in Electronics ?

Professional Graphics Controller (PGC, often called Professional Graphics Adapter and sometimes Professional Graphics Array) is a graphics card manufactured by IBM for PCs. It consists of three interconnected PCBs, and contains its own processor and memory. The PGC was, at the time of its release, the most advanced graphics card for the IBM XT and aimed for tasks such as CAD.

Introduced in 1984, the Professional Graphics Controller offered a maximum resolution of 640×480 with 256 colors at a refresh rate of 60 hertz—a higher resolution and color depth than CGA and EGA supported. This mode is not BIOS-supported. It was intended for the computer-aided design market and included 320 kB of display RAM and an on-board Intel 8088 microprocessor. The 8088 ran software routines such as "draw polygon" and "fill area" from an on-board 64 kB ROM so that the host CPU didn't need to load and run these routines itself. While never widespread in consumer-class personal computers, its US$4,290 list price compared favorably to US$50,000 dedicated CAD workstations of the time (even when the $4,995 price of a PC XT model 87 was included). It was discontinued in 1987 with the arrival of VGA and 8514.