Texas Instruments Systems Simulator BN444. All the DTL flat pack logic chips date to 1966. The Datasheet for these IC’s can be found here.

An extract from the Texas Instruments Breadboarding manual, giving an Introduction to the system:

The BN444 and BN440 have been devised to provide facilities for rapid breadboarding of integrated circuits subsystems.

They enable the user to check out both digital or analogue designs by plugging the appropriate network into the patchboard and making connections with plug-in leads.

They are especially suitable for schools and colleges for teaching logic where the appropriate logic gates can be connected to give a practical layout of Boolean expression and for logic designers to rapidly simulate any digital or analogue system.

In the photos below you can see Frank Lund, alongside the Logic breadboarding system he rescued back in the 70’s.

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