Telesoftware broadcast in 1981 for a computer called the ABC800 converted to run on the MEGA65

On 22nd February 1981, BBC1 Ceefax broadcast some telesoftware for a teletext-compatible computer, older than the BBC Micro, that you've probably never heard of called the ABC800. I've converted it to run on the MEGA65 so that we can see what it does. You can see the original telesoftware teletext page here: gr...
It uses a Monte Carlo method which randomly paints pixels to work out the ratio of points in a circle compared to points in a containing square in order to estimate the value of pi. It also monitors its own accuracy by drawing a graph at the bottom of the screen with the horizontal axis being the actual value of pi.
The garish colour scheme is in the original!
MEGA65: mega65.org/