Re: OMY - what are these devices?
I've found the blue and black catalogue mentioned in post #13 whilst looking in the shed for something else. It's titled Mullard Industrial Semiconductors Quick Reference Guide 1967/68. The page I have posted identifies the OMY device functions and has a few parameters mentioned, including apparently the need for a +/- 6V supply.
It says that the main data is published in Volume 7 of the Mullard Technical Handbook, presumably for 1967/68. If anyone has this volume, it would be useful to find out the full data and the pin-out details for the 10 pin TO-5 style packages.
The devices I have are OMY120 3 input DTL (diode transitor logic) NOR/NAND gates, OMY122 bistable steering circuits and some OMY125 five diode logic gate input expanders.
The FCH series DTL following the OMY data seems to have more gates per package and is presumably a later generation of DTL.
Ron
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