Nakazoto
commented
2 years ago Oooh, very interesting! The fact that it could be related to the core memory makes it even more exciting, and I think you may be onto something. The transformers were throwing me for a loop, but being sense amplifiers makes perfect sense.
I updated the Wiki with your information!
Cheers, David
On Wed, Jun 29, 2022 at 1:08 PM rsteck @.***> wrote:
The board labeled "Gated CPA" appears to be a sense amp for reading two columns of the core memory. The board has two threshold amps/latches that feed into what looks like an output amp. I believe the cross-coupled transistors with inductors in the amplifier serve as latched also. I'd have to run spice to verify this as it's an uncommon configuration.
Not sure why it's "gated", although pin 1 may be an effective "enable". Pin 3 may also be a bias voltage or "gate".
The back-biased diodes on the transformer legs are obviously for switching spike elimination.
A guess, of course. Fascinating bit of history...
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The board labeled "Gated CPA" appears to be a sense amp for reading two columns of the core memory. The board has two threshold amps/latches that feed into what looks like an output amp. I believe the cross-coupled transistors with inductors in the amplifier serve as latched also. I'd have to run spice to verify this as it's an uncommon configuration.
Not sure why it's "gated", although pin 1 may be an effective "enable". Pin 3 may also be a bias voltage or "gate".
The back-biased diodes on the transformer legs are obviously for switching spike elimination.
A guess, of course. Fascinating bit of history...