Delete comment from: Ken Shirriff's blog

DHess said...

Another use for an extra diode, in series with a base or emitter, is to raise the input threshold of bipolar logic to increase noise immunity. The old 1488 quad line driver which is still commonly used for RS-232 does this.

Jul 29, 2019, 7:37:47 PM

Posted to Apollo Guidance Computer: Dipstiks and reverse engineering the core rope simulator