jetpac.nes/src/vectors.s, branch main

Remove vector.s

2026-02-12T23:03:07Z

Instead of this, the 'reset' function can go into 'jetpac.s', as we could consider it's part of the 'main' work. As a bonus, doing this alignment gives us 3 bytes back from ROM space. Not that we care too much about space, but it's amusing nonetheless. The debug scope has been moved into its own file in include/. Admittedly it's not the most crucial file in the project, but it makes things more logical and it opens the door to more debugging utilities. This leaves us with a vector.s file only containing interrupt code. Thus, it just makes sense to rename it to interrupts.s, which in the end makes things more organized. Signed-off-by: Miquel Sabaté Solà

Adapt the code to play well with nasm's asan

2025-12-15T14:31:06Z

The address sanitizer from nasm provides quite a few goodies, so let's adapt the code more to it to benefit from those. Signed-off-by: Miquel Sabaté Solà

Don't handle frame drops unless PARTIAL is set

2025-10-12T20:38:43Z

This fixes commit 6e274fb50251 ("partial: Account for frame drops") in the sense that the accounting of frame drops should _never_ affect production binaries. Even if the two instructions would've never been reached if PARTIAL=0, they would still be included in the final binary, which is not necessary. Signed-off-by: Miquel Sabaté Solà

Initialize enemies at a random Y coordinate

2025-05-16T05:55:56Z

The randomness comes from a pre-computed table of "random" numbers. This is of course the most simple technique you can come across a code base for the NES/Famicom, but for the purposes of this game is good enough and (most importantly) fast. Signed-off-by: Miquel Sabaté Solà

partial: Account for frame drops

2025-05-15T04:41:32Z

Define tracing variables when PARTIAL=1, which is only on a development environment. This way we can detect whether we are dropping frames or not. Signed-off-by: Miquel Sabaté Solà

reset: Do not zero out RAM

2025-05-12T19:20:33Z

This is usually done so the programmer can forget about initializing in the future, but it not only hides programming mistakes, but we are also resetting memory addresses which are never to be used by this simple game. Hence, just skip resetting RAM altogether. Last but not least, sprite initialization in `reset` code has also been optimized so instead of around 2000 cycles it takes half of that. This is done by only touching the first byte of the four bytes for a sprite in OAM, which is enough for hiding random sprites and the cost of extra `inx` instructions is far cheaper than all the extra `sta` to absolute address with X-index from the old code. Signed-off-by: Miquel Sabaté Solà

Add the ability to pause the game

2025-04-03T17:02:10Z

Signed-off-by: Miquel Sabaté Solà

player: First PAL implementation

2025-04-02T19:22:42Z

The steps by which a player increases its current velocity to reach the target one has been adapted on PAL, so every five frames it takes an extra step compared to NTSC. This at least brings PAL to grow its values at the same rate as NTSC. Signed-off-by: Miquel Sabaté Solà

reset: Read the PPU status before the first wait

2025-03-19T16:30:46Z

That is, stick more closely to what the reference reset implementation does. Signed-off-by: Miquel Sabaté Solà

Disable the PPU between the title to main screens

2025-03-19T16:28:36Z

During other transitions like game over and such it might also be needed to have something similar, but for now this should cut it. Signed-off-by: Miquel Sabaté Solà