Wire-contact attachment types D-subminiature

a male pcb-mounting dd50 connector (plug)

there @ least 7 different methods used attach wires contacts in d-sub connectors.

solder-bucket (or solder-cup) contacts have cavity stripped wire inserted , hand-soldered.
insulation displacement contacts (idcs) allow ribbon cable forced onto sharp tines on of contacts; action pierces insulation of wires simultaneously. quick means of assembly whether done hand or machine.
crimp contacts assembled inserting stripped wire end cavity in rear of contact, crushing cavity using crimp tool, causing cavity grip wire tightly @ many points. crimped contact inserted connector locks place. individual crimped pins can removed later inserting special tool rear of connector.
pcb pins soldered directly printed circuit board , not wire. traditionally through hole plated (thp) board style pins used (print) increasingly gull wing surface mount (smd) connections used, although latter exhibit solder pad contact problems when exposed mechanical stress. these connectors mounted @ right angle pcb, allowing cable plugged edge of pcb assembly. while angled connectors traditionally occupied significant room on pcb, flat smd connector variants produced various manufacturers. electrical/mechanical anchor points (often soldered) connector shell , locking screws provided, differ in position between , eu connector variants, correct type must used unless pcb designed accept them both. pcb connectors available in variants either inch or metric pitch of soldered contacts. tolerances typically large enough allow mounting of smaller connectors regardless of pitch variant used, not hold true larger connectors.
wire wrap connections made wrapping solid wire around square post wire wrap tool. type of connection used in developing prototypes.

the wire wrap , idc connections styles had contend incompatible pin spacing 0.05 inch ribbon cable or 0.1 inch proto board grid, larger pin counts.