In October and early November, Simon was busy with another attempt to simulate SAP-1 (simple as possible processor, an 8-bit computer) in Circuitverse (something that he hadn’t managed to complete when he tried it last time). I’m not even sure if anyone uses Circuitverse for such large-scale projects.
On November 7, Simon finally managed to finish the RAM on his simulated 8-bit computer (a computer where every general-purpose register contains 8 bits and therefore can only process 8 bits of data)! Although he is far from the end of the project, he is convinced that the RAM is the hardest part, so “now everything is going to be okay!”
“RAM was the hardest mainly because I have been trying to build the subcircuit for the RAM myself, which is not going to do it for SAP-2”,(Simon’s next ambition, also an 8-bit computer but with 64K memory, 2K PROM + 62K RAM). “This time the RAM I needed was particularly small, so I built a mini-RAM myself”.
You can view and launch this (unfinished) project via this link: https://circuitverse.org/users/7241/projects/35775
All of Simon’s projects on his Circuitverse page: https://circuitverse.org/users/7241
Simon’s current plan is to record a series of videos based on the Digital Computer Electronics book he uses as a guide in his engineering projects.
These are some simpler circuits from late September, simulated on Tinkercad: