SpritesMind.Net

You didn't allocate it, and wrote to random memory. You really need to review your C basics.

Surely you can repeat the test with recording different lines? If the ROM does the same thing, and only one thing, you can first record these lines, then those lines... Saves money vs a big scope. edit: Or if you really need simultaneous channels, buy several and have them record at once ;) If you h...

The Saleae logic16 clones are very cheap and work well, if the specs are enough for you (16 channels etc). IIRC I paid under 20$ from ali.

Probably tons, just search github for it. Usually they use a microcontroller to emulate one, soldering real buttons to GPIOs is just an extension of that.

It's all more expensive than the targeted, small chips of real controllers, but well doable yourself.

The current pics lack a bit in contrast. Try making the BG elements darker so they can be more clearly told apart from FG.

'z'+1 is a char, not a part of a string.

'z'+1 or {

Store a list of the filled pixels. As ranges, very little space taken.

The battery is not used when the console is on. It's for keeping power when the console is off.

You might also use a command undo queue, instead of storing pixel-level changes.
"plot black at 12,23"
"fill area at 15,5 with green"

You'd just store the inverse commands, taking very little ram.

Union-struct is the nicest way, but nibble access won't be fast no matter what.

Oh, didn't know it was write-through, thanks for the correction. And sad that you bowed to the crazies. I would have kept the words and banned the crazies.

Uncached on both cpus, or manual syncs between.

If you don't need cycle-accurate reports, you can easily do visual profiling on any emulator or even real hw. VDP_setEnable(0) and (1) around the code, and you will see on screen how many lines it takes. One line is about 500 cpu cycles. This is a quick and easy method that lets you see, for example...

How useful

Use open source programs and you don't have to guess.