Happened across this advertisement for Signetics' Write-Only Memory IC, which was published in 1972 - you guess the exact date of publication.
A copy of it resides here: http://www.national.com/rap/files/datasheet.pdf
Be sure to zoom in on the Block Diagram to note the handy features, and the novel Drain concept.
The "Bit capacity vs Temperature" chart on page 2 is quite illuminating, along with the "Pins Remaining vs Number of Socket Insertions" diagram. It's too bad that more vendors don't supply this kind of data.
Anyway, I'd been looking for just such a device for implementation of a non-intelligent microcontroller. Now if I could only find a FISH (First In Still Here) register I'd be all set.
A copy of it resides here: http://www.national.com/rap/files/datasheet.pdf
Be sure to zoom in on the Block Diagram to note the handy features, and the novel Drain concept.
The "Bit capacity vs Temperature" chart on page 2 is quite illuminating, along with the "Pins Remaining vs Number of Socket Insertions" diagram. It's too bad that more vendors don't supply this kind of data.
Anyway, I'd been looking for just such a device for implementation of a non-intelligent microcontroller. Now if I could only find a FISH (First In Still Here) register I'd be all set.