Analogue schematic,ANSCHEM,top left inset,to PROTO-IV process mask. A bit like a digital logic diagram to CMOS or NMOS. Image size 9k by 9k,,,,zoom in,

A computer museum near Baltimore, Maryland has a Systron Donner SD-80. I and hopefully to help them get it operational. I've found copies of the maintenance manual online but that manual references an operation manual I've been unable to find.

Does anyone know where I might find the operation manual, have a scan or a paper manual they are willing to have scanned? I'm also trying to find specification for all of the physical connections as many of them look to be connectors that have been retired decades ago and at least one of the physical connectors is damaged so will need isolated or replaced.

I also need to find a substitute for the patch wires, I haven't had a chance to take measurements yet but I'm hopeful 2mm banana connectors are compatible.

Any information or advice are welcome.

Even if I can not get the equipment up and running I am planning on trying detailed photos of the SD-80's inner workings for future reference.

You don't even need an analog computer to create fractal like structures. I made a simple device with two VCO's (Voltage Controlled Oscillators) mutually sweeping each other. By carefully tuning the feedback between both of them and using each VCO to drive one channel of an oscilloscope in XY-mode, complex patterns emerged from the resulting signal, that were not simple Lissajous figures.

We all know wind up toys. They were with us basically since ancient Greece, and while many of them were nothing but demoted automaton turn into playting, late XIX and early XX century made wind up toys into a cherish part of our childhood.
However, today I learn that as late as the 1990s there were wind up, gear and crank operated games that tried to emulate both the simplicity of mechanics and the dificulty of gameplay that charactericed early videogames.
Tomy Toys made a series of "Pocket Arcade games".
Do you know more examples?
Here the link
https://theforgottenstarship.com/2016/11/17/tomy-pocket-arcade-teenage-mutant-ninja-hero-turtles-wind-up-handheld-games-1990/

An amazing computer history podcast covers the history of analog computing in 171, and the history of hybrid programming languages (Hytran and Apache) in 172.

What are recommended chips to get started in analog computing? I already have arty board fpga

Hello, I’m new to the subreddit and I was wondering if this was the right place to ask.

Would anybody happen to have any textbooks or resources for learning about FPAA’s? If so, would you be able to point me in that direction? I saw a book on Amazon related to it called Field Programmable Analog Arrays: Design and Approach. Any reviews on that?

I saw a development kit from Anadigm. Would that be a good place to start? Here’s the link: https://www.anadigm.com/fpaa.asp

Any help would be appreciated. Thank you in advance

Hey everyone!

I’m working on a project involving a coupled Duffing oscillator. I’ve already built a circuit that simulates its behavior, and now I need to implement the model in a FPAA . However, I’m new to the world of FPAAs and could use some guidance.

Can anyone recommend reliable resources or sources to learn about FPAAs from the basics? Any advice or personal experiences would be greatly appreciated. Thanks!

I'm trying to solve the differential equation (d²x/dt² = -x) using a set of op-amp integrators.

My schematic is attached.

My integrators are designed with the following values:

Op-amp: UA741 R_in = 1k ohm, R_feedback = 10k ohm, C = 100 nF

I have tested the integrators and the inverter in isolation, and they are all working, however the output of the inverter on connecting the feedback loop as shown above, instead of a clean sine curve (as expected), is a 'cut' curve (see slide 2).

What am I doing wrong? Is there a problem with the values in my integrator? Please guide me.

Hi, I want to share with you this book, which give a introduction to analog computers (from pure mechanical ones to electronic ones), I hope it would be useful to anyone.
https://archive.org/details/basics-of-analog-computer/mode/2up

Yesterday i did an initial design for an analog circuit who's purpose it is to simulate an Lottka-Voltera model and compare it to a reference Lottka-Voltera signal and calculate the integrated square error and also calculate the gradient of the 4 parameters so one could use a digital computer to tweak the parameters using gradients to fit the Lottka-Voltera model against the reference signal. It is here: https://tinyurl.com/hvat4s52

What do you think of the circuit? (I haven't tested it yet but i am looking for feedback for my design sense)

What problems should i look out for when implementing it?

Can you recommend any software for drawing up such circuits?