Issue No. 04 - July/August (1972 vol. 5)
Designers of microprogrammed computers have been using solid-state, random-access memories as scratch- pads and solid-state read-only memo- ries to store microinstructions and program constants. TTL (transistor- transistor logic) integrated circuits are frequently chosen because TTL speed is high.
D. Mrazek, "Industry Update", Computer, vol. 5, no. , pp. 49-53, July/August 1972, doi:10.1109/C-M.1972.216943