Atari Portfolio technical specifications
| Date of release | End of 1989 |
| CPU | 80C88 (16bit internally, 8bit externally) / 4.9 MHz |
| ROM | 256 KBytes |
| RAM | 128 KBytes, expandable to 640 KBytes |
| Display | Internal LC Display |
| Resolution | 40 x 8 characters, 240 x 64 pixels |
| Colors | monochrome (b/w) MDA emulation |
| Sound | 1 channel, mono |
| OS | DIP-DOS 2.11 (MS-DOS 2.11 compatible), runs from ROM |
| Storage | Internal card-drive |
| Interfaces | Memory-Card slot Peripheral port ("Portfolio Bus", 60 pins) |
| Physical dimensions | 200 x 100 x 25 mm |
| Weight | 454 grams (about 1 lb.), excl. batteries |
| Power supply | 3 x AA / Mignon / LR6 size removable alkaline
batteries Memory preserved during battery changes AC mains adaptor |