Wow. Some good tips there. I learnt to program the 6502 on the C64/128 when I was a kid. Used to do demo's and rip games apart etc. The only other asm I've done is a couple of years coding 68K on the MegaDrive. The 2600 is quite a challenge after 20-odd years of making games with higher level languages and tools. Absolutely loving getting back down to the metal again. Makes me feel like a big kid .