Header, female, 2 x 25 pin, straight

*Part number*	*Datasheet*
Farnell: 2847249	Multicomp, 2214S-50SG-85
Farnell: 2308495	Samtec, SSW-125-01-T-D
Mouser: 200-SSW12501FD	Samtec, SSW-125-01-F-D
RS: 154-8343	Samtec, SSW-125-01-S-D

This component is very expensive from popular suppliers.

Homebrew 8-bit retro computing