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I've a few virtual registers in zero page with a few contracts when functions are called and I need more than just A/X/Y. Argument registers (a0-a7) are preserved by the called function. Use to pass parameters to methods, or to store variables if you've run out of work registers ;) Temporary registe...

Shouldn't you just need two 8-byte attribute caches for top/bottom and two 7-byte attribute caches for left/right, or am I missing something? You can also store two attribute tables for when row % 4 = 0, and when row % 4 = 2. This way you can just store packed attributes to send straight to the attr...

Keldon's 119 cycle multiply with 16-bit output Requires: 1. 512 bytes ROM. 2. 4 zero page registers for input and return. The way it works is really simple (basically long multiplication). It's slower than Damien's 90 cycle fmul, executing 118-119 cycles, which makes it on average faster than euror...

This is brilliant!!!

I've been playing around with some high level macros as well and I've found a way for a macro to accept either a local parameter or an actual register with the following code: MovLocal @index, regA I'll also explain how you can achieve the following flexibility with the same macro: MovLocal @index, ...

I know this is old (Garth already necro'd ), but shouldn't that be ldx?

My bad I meant: To force opcode $B9.

How about: