IBM logic over the years  
IBM SLT backplain. Used in the S/360, IBM 1130 and 1800.
IBM SLT backplain. Used in the S/360, IBM 1130 and 1800.

SLT and MST card extender.
SLT and MST card extender.

IBM MST-1 backplain. Used in the IBM S/370, S/3, S/7 etc.
IBM MST-1 backplain. Used in the IBM S/370, S/3, S/7 etc.

IBM Relays used in mechanical record equipment during the '50.
IBM Relays used in mechanical record equipment during the '50.

IBM 'highspeed' relays used in record equipment.
IBM 'highspeed' relays used in record equipment.

Top side mechanic counter from a 402/405/412 machine +/- 1945/1950
Top side mechanic counter from a 402/405/412 machine +/- 1945/1950

Bottom side mechanic counter from a 402/405/412 machine +/- 1945/1950
Bottom side mechanic counter from a 402/405/412 machine +/- 1945/1950

IBM Counter. A more modern version.
IBM Counter. A more modern version.

Box of spare IBM Tube modules used in the 600 serie.
Box of spare IBM Tube modules used in the 600 serie.

IBM tube modules used in the 700 serie.
IBM tube modules used in the 700 serie.

IBM printed circuit card used in the first transistor computer made by IBM
IBM printed circuit card used in the first transistor computer made by IBM

IBM SMS cards used in the 14xx and 1620 series.
IBM SMS cards used in the 14xx and 1620 series.

SMS Core memory used in the IBM S/360 unit record controller.
SMS Core memory used in the IBM S/360 unit record controller.

IBM SMS card extender for diagnosing problems at component level.
IBM SMS card extender for diagnosing problems at component level.

Left:
SLT card: 1 wide, 1 high.
Middel:
SLT card: 1 wide, 2 high.
Right:
SLT card: 2 wide, 2 high.
Left:
SLT card: 1 wide, 1 high.
Middel:
SLT card: 1 wide, 2 high.
Right:
SLT card: 2 wide, 2 high.

SLT Planar
SLT Planar

Top:
MST card: 2 wide, 2 high.
Bottom:
MST card: 4 wide, 2 high.
Top:
MST card: 2 wide, 2 high.
Bottom:
MST card: 4 wide, 2 high.

MST card: 4 wide, 3 high.
MST card: 4 wide, 3 high.

MST-4 card. Recognisible on the bigger edge connectors.
MST-4 card. Recognisible on the bigger edge connectors.

IBM card with TTL IC's. The IC's where stamped with IBM part numbers. These cards where used in the IBM 3271, 3277 etc
IBM card with TTL IC's. The IC's where stamped with IBM part numbers. These cards where used in the IBM 3271, 3277 etc

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