| Type | Integrated Circuit | |
| Case | DIP28 | |
| Manufacturer | National Semiconductor - NSC | |
| No.of Addr. Modes | 10 | |
| No. of I/O Lines | 23 | |
| I/O Line Types | Byte/GenP | |
| Max. Inst. Len (bits) | 16 | |
| Min Inst. Len (bits) | 8 | |
| No. of Intrpt Lines | 1 | |
| No. of Intrpt (NMI) | 1 | |
| Intrpt Types | Prty/Vecto | |
| No. of Intrpt (mask) | 13 | |
| fClk Max. (Hz) | 10M | |
| fClk Min (Hz) | 0.0 | |
| No. of I/O Ports | 5 | |
| On-Chip ROM (bytes) | 4k | |
| Nom. Supp Volt | 5.0 | |
| Tech. | CMOS Integrated Circuit | |
| On-Chip RAM (Bytes) | 192 | |
| Oper. Temp (°C) Min | -40 | |
| Oper. Temp (°C) Max. | 85 | |
| Pinout Equivalence Number | 28-551 | |
| Descript | Memory-mapped I/O | |
| No. of Pins | 28 | |
| Surface Mounted Yes/No | NO | |
| SKU | 1128725 | |