| Carriage | Narrow |
| Connector/Port | Parallel, USB |
| Depth | 13.60 in |
| Emulations | Epson® FX, IBM® ProPrinter® |
| Height | 6 in |
| High Speed Draft Printing | 510.0 cps |
| Input Buffer | 128 kB |
| LCD Display | No |
| Maximum Form Parts | 6 |
| Maximum Print Speed (Black) | 570.0 cps |
| Model Name/Number | Microline® 420 |
| Monthly Duty Cycle (Pages) | 24000 |
| Near Letter-Quality Printing Speed | 95.0 cps |
| Network Capable | Yes |
| Network Ready | No |
| Network Types | 10/100 Base-TX |
| Number of Pins | 9 |
| Operating System Compatibility | Windows® 3.x, 95, NT 4.0, 98, 2000, XP |
| Paper Feeder Type | Sheet Tray |
| PC Free Printing | No |
| Print Resolution (Black) (Width x Height) | 216 @ 240 dpi |
| Printer Type | Dot Matrix |
| Standard Memory | 128.0 kB |
| Super Speed Draft Printing | 570.0 cps |
| UOM from Inventory Unit Code | EA |
| Utility Printing Speed | 380.0 cps |
| Width | 15.70 in |