I am pretty sure you can find similar tales of squeezing every single available byte out of the c64 in programmer diaries from the eighties. Bank-switching the

I am pretty sure you can find similar tales of squeezing every single available byte out of the c64 in programmer diaries from the eighties. Bank-switching the VIC and SID out and dumping rarely-changing data like character sets into the space normally used for their I/O registers was not uncommon back then.