In the 1980s, NCR sold various PC compatible AT-class computers, like the small NCR-3390 (called an "intelligent terminal"). They proposed a customized version of MS-DOS named NCR-DOS, which for example offered support for switching the CPU between 6, 8 or 10 MHz speeds. The computers featured an improved CGA adapter, the NGA, which had a 640×400 text mode more suitable for business uses than the original 640×200 mode, with characters drawn using single-pixel-wide lines, giving an appearance similar to that of classic IBM 3270 terminals. The additional four-color 640×400 graphical mode was identical to CGA's 320×200 mode from a programming point of view.
In the 1980s, NCR sold various PC compatible AT-class computers, like the small NCR-3390 (called an "intelligent terminal"). They proposed a customized version of MS-DOS named NCR-DOS, which for example offered support for switching the CPU between 6, 8 or 10 MHz speeds. The computers featured an improved CGA adapter, the NGA, which had a 640×400 text mode more suitable for business uses than the original 640×200 mode, with characters drawn using single-pixel-wide lines, giving an appearance similar to that of classic IBM 3270 terminals. The additional four-color 640×400 graphical mode was identical to CGA's 320×200 mode from a programming point of view