| AG | Output |
| ALME | Asynchronous Line Multiplexer Extended. LFI 1819-xx (legacy PSP), 1882-xx (PSR) |
| BA80 | VDU that supports two windows (second window is assigned to a slave channel). Has a 15 pin V24 and several SAS connections (one used for keyboard) |
| BASIC | Primary programming language for the 8870. TAMOS and many of the system utilities are written in BASIC |
| CDH | Large hard-disk type unit found on the M45. These are 132 MB formatted |
| DAP4 | VDU. Has three SAS ports (one required for keyboard). |
| DIABLO | Disk drive used on the 8870/M10. 5 MB formatted capacity. Also called a HAWK drive. (Short movie here) |
| DSP | Disk Services Processor – Tool to allow direct manipulation of disk blocks, memory and their contents. Also has a dis-assembler |
| ECC | Error Correcting Controller. 2515-xx was an ECC |
| EG | Input |
| FB | Busy Flip-Flop |
| FD | Floppy Disk. Both 5 1/4 and 8 1/2 drives were available as optional extras on all models. |
| HAWK | see DIABLO |
| LFI | Refers to a part number plate stamped or stuck on all hardware components. Consists of a 4 + 2 part number and an 8 digit unique serial number |
| LKS | Card Punch |
| LMVG | Read and Compare |
| LSL | Paper Tape Reader |
| LSS | Paper Tape Punch |
| MD | Medium Duty (used in printer model numbers. ie. MD07) |
| ND | Normal Duty (used in printer model numbers ie. ND11) |
| ND04 | SAS dot-matrix printer 132 column |
| ND11 | SAS dot-matrix printer 132 column (faster version of the ND04) |
| NIROS | Nixdorf Interactive Real-time Operating System |
| PLC/PLC2 | Programmable Line Controller. Available as a single or dual channel variant. |
| PSP | Parallel Periphery Interface. (Legacy) |
| RAL | Random Access Load |
| SAS | Serial Workplace Interface. A serial data connection method for interconnecting different devices. Can also supply a limited amount of power. |
| SMC | Streaming Mode Cassette/Cartridge. Primary backup method of the M15/M25/Q40/Q80 models along with others. |
| SMD | Storage Module Device. 5 platter disk packs used on the M55/M65 along with others. 33 MB or 66MB unformatted. |
| WT | Framing Pulse |
| ZD | Heavy Duty |
| ZD09 | SAS high speed, heavy duty dot-matrix printer |
| ZDV | Line Printer DMA Feature |
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