I forget who wrote half of this, but here goes: [...] PGA = Professional Graphics Adapter, as Kip Crosby so rightly pointed out. When I was at IBM this was called PGC (C = Controller). FWIW, the PGC was three circuit boards bolted together, the two outer ones going into adjacent slots of an XT motherboard. It had an 8088 as graphics coprocessor, and did 640 x 480 x loads of colours. But back to the original question, No, it isn't PGA. (Although most of the chips on the cards are likely to be PGAs, in IBM custom metal cans, as I recall...) The IBM 5272, the 3270PC display, was a very nice monitor. I don't know the pixel resolution, but I'd guess at 800 x 400. Unfortunately, AFAIK, it only did 8 colours. The 3270PC display card did TEXT MODES ONLY - it was aimed at emulating the 3279 terminal. You could buy two add-on cards for it that went in the slots either side in the motherboard. 1. The PS card. This provided emulation of the Programmed Symbols option on the 3279. Very nice graphics, but only as a terminal, not as a PC (although presumably you could have written PC drivers for it...) 2. The APA card. This provided support of the All Points Addressable modes of the CGA. These CGA modes were displayed in the top lefthand corner of the screen. And the only 8 colours reduced the capability somewhat as well. It looked very good, but AFAIK IBM never supported it properly. Pity. Later IBM released the 5370 series machines. These included the 3270PC/G and the 3270PC/GX. These had full graphics capability, the G on a monitor the same size as the 5272 (but with I think more colours); the GX had a graphics coprocessor (5378) in a box the size of a PS/2 model 30 and a 19 inch monitor (5379) with lots of pixels (1280 x 1024 I think, but could have been only 1024 x 768) and I don't know how many colours (but might have been 64). But your description of the 3270PC sounds like you've got only one of PS and APA, alas. Hope this helps Philip.

No, it isn't PGA. (Although most of the chips on the cards are likely to be PGAs, in IBM custom metal cans, as I recall...) The IBM 5272, the 3270PC display, was a very nice monitor. I don't know the pixel resolution, but I'd guess at 800 x 400. Unfortunately, AFAIK, it only did 8 colours. The 3270PC display card did TEXT MODES ONLY - it was aimed at emulating the 3279 terminal. You could buy two add-on cards for it that went in the slots either side in the motherboard. 1. The PS card. This provided emulation of the Programmed Symbols option on the 3279. Very nice graphics, but only as a terminal, not as a PC (although presumably you could have written PC drivers for it...) 2. The APA card. This provided support of the All Points Addressable modes of the CGA. These CGA modes were displayed in the top lefthand corner of the screen. And the only 8 colours reduced the capability somewhat as well. It looked very good, but AFAIK IBM never supported it properly. Pity.

But your description of the 3270PC sounds like you've got only one of PS and APA, alas. Hope this helps Philip.