The PDP-11 was the most popular 16-bit minicomputer. Introduced by DEC in 1970, it remained in active production until 1996. The PDP-11 family included many processor designs (photographs courtesy of Digital Equipment Corporation):
| Option | Description | Capacity |
| CPU and memory | J-11, integral floating point accelerator | 16KB - 4MB |
| CPU options | Commercial instruction set (CIS) | |
| PDP-11/45 compatibility mode (18b addressing) | ||
| PDP-11/70 compatibility mode (22b addressing + I/O map) | ||
| Console | DLV11 full duplex asynchronous interface | |
| Paper tape | PC11 paper tape reader and punch | |
| Real time clock | KW11L real-time clock | |
| Line printer | LP11 line printer | |
| Terminal multiplexor | DZ11 multiplexor | 8-32 lines |
| DHQ11 multiplexor | 8-32 lines | |
| Disk | RX11/RX01 single density floppy disk | 256KB |
| RX211/RX02 double density floppy disk | 512KB | |
| RK11/RK05 cartridge disk | 2.5MB | |
| RLV12/RL01-RL02 cartridge disk | 5-10MB | |
| RK611/RK06-RK07 cartridge disk | 13-26MB | |
| RH11-RH70/RM03, RM05 disk packs | 67-256MB | |
| RH11-RH70/RM80 non-removable disk | 124MB | |
| RH11-RH70/RP04 (RP05), RP06 disk packs | 87-174MB | |
| RH11-RH70/RP07 non-removable disk | 516MB | |
| RQDX3/RX50, RX33 floppy disks | .4-1.2MB | |
| RQDX3/RD51,RD52,RD53,RD54, RD31 disks | 10.8-155.6MB | |
| RQDX3/RA72,RA82,RA90,RA92 disks | 608-1470MB | |
| DECtape | TC11/TU56 DECtape | 296KB |
| Magnetic tape | TM11/TE10 800bpi 9 track magnetic tape | |
| TS11/TSV05 1600bpi 9 track magnetic tape | ||
| TQK50/TK50 TMSCP magnetic tape | ||
| Network | DELQA/DEQNA Qbus Ethernet controller | |
| DEUNA/DELUA Unibus Ethernet controller |
Updated 30-Jun-2004 by Bob Supnik (bob AT supnik DOT org - anti-spam encoded)
