The Tektronix 240 is a pre-GPIB "Program Control Unit" introduced in 1968 for the Tektronix 568 scope and 230 readout. It can be extended using the R250 so that it can control other instruments such as the R116 or R293 pulse generators.
The 240 can execute programs from an optional magnetic disk or paper tape, for example as installed in the S-3130 testing station.
- Tektronix 240 Manual (OCR, PDF)
- 240 and R250 Description from Tektronix Automated Testing Systems book (PDF)