> The 3-voice sound chip was coverted by us BBC types - and the C64 colour > was good, but hey, bloatware, it had 64k compared to a B's 32 ....
I dunno, us hard core speccy programmers can to wiggle the speaker directly to get more than one note out of it. The only problem is that if you didn't XOR with the correct mask the border would light up like a stripey christmas tree[0]. [0] Hence the reason[1] for the border effects during loading. [1] The hardware port for the microphone, speaker and colour of the border were the same port - just different bits. When you shifted the bits you got the funky border.