Old RPN w/ discrete components and acoustic memory

[Paul Berger (Canada)]

(03-05-2020 05:44 AM)toml_12953 Wrote:  

(03-04-2020 01:13 PM)ndzied1 Wrote:  Maybe it’s been shown before but really cool video.

https://youtu.be/2BIx2x-Q2fE

I still don't really get acoustic memory. How does it store the information for more than a few milliseconds as the pulse goes around the loop to the end?

Many years ago I used to service a proof machine that had delay line memory and that machine had a solid state shift register in between the two ends of the delay line that you would insert and retrieve data from, but since it is a continuous stream of bits that you cannot stop, you need to know when a unit of data is aligned in the solid state register and insert or retrieve data before the shift register advances.

I also took a call on a test scoring machine one time that used delay line memory to hold the correct answers that where compared to the students answer sheets.

Paul.