I wrote several articles about the ARM1 when this simulator was released in 2015. A better article to start with is: http://www.righto.com/2015/12/reverse-engineering-arm1-ances...

Dave Mugridge also wrote some articles about the ARM1, focusing more on the ALU and registers: https://daveshacks.blogspot.com/2015/12/inside-alu-of-armv1-...