@teajaygrey You were well ahead of me. Up until (I think) 1990, I had only worked with variants of BASIC. I did have some documentation for Z80 assembly, buy didn't grok it (and didn't have the tools). I picked up 68000 assembly in 1990, I saw some i386 and some PPC in the 90s, a bit of ARM after that, but I've only really picked up 8-bit CPUs recently.