- How to make a rom hack of gauntlet serial#
- How to make a rom hack of gauntlet update#
- How to make a rom hack of gauntlet code#
If you are doing this to work around a broken button on your device you can't be bothered to fix then you might end up with 30 odd things to do to take care of all the menus, in game actions and whatever else, though also works to decouple actions that might be doubled up for the same button (ever wanted not to fire a fireball as fire mario when setting out running? You could do it with this approach). If it is just an action within the game then great. You tell it instead to check for another state. Here it will typically have something that once a frame checks to see what is pressed (or maybe back to the interrupts thing) and it will check this state and act accordingly. Hard to do if the system controller state is read only and the game does not debounce.Ģ) You alter the thing looking for a given press to look for another (or possibly an impossibility if you are about disabling things - assuming you are not using a dance mat think left and right at the same time). Might have to add a second one if you are swapping buttons. You would probably do this with a mask (copy it, blank all the other bits, check to see if the value = pressed, adjust accordingly) so you don't have to do this for every combination of controls. you need a few bits, more still if you have analogues) you make a quick thing that runs once a frame or whatever and says if bit 0 = pressed then set it to unpressed and then set bit 1 to pressed. Twiddle the data section covering the controller state to say something else say bit 0 is A and bit 1 is B in the whole probably 16 bit value (up, down, left, right, start, few buttons. Games will either have checks once per frame as to what has been pressed or will have interrupts ("when this happens do this, possibly regardless of what else is happening") and react accordingly.ġ) You alter the bit in question for the button you want. We will have to cover the basics here first before the fun stuff.
How to make a rom hack of gauntlet serial#
There are further considerations if you are making an emulator like serial (each button has its own section) vs parallel (once a frame/when requested the controller sends a packet of data containing the control info but that should matter little here and is usually more a concern of people making controller adapters, some aspects of turbo/macro controls and third party controllers.īack on topic.
How to make a rom hack of gauntlet update#
This means buttons only update once per frame (modern PC games dodge this by decoupling things from framerate and technically many older things will have interrupts) but it also means that things might not appear pressed one millisecond and not the next while you press the button and the physical contacts figure out what they are doing.
Other games/devices will copy this state say once per frame to another part of memory and operate from that. This is considered bad form by many as switches are imperfect (see switch bounce) and can make for odd behaviours in game. Some games/devices will use this state directly.
How to make a rom hack of gauntlet code#
Hardware documentation (for which the MAME source code is what most would look to for arcade stuff, and frankly a lot of consoles too) will note where and what it means. There are a few things to watch for and that can make life easier, though seeing them on arcade is something of a rarity, but more on that later.Īnyway most devices will have their control state transmitted to some part of memory. MAME covers a wide variety of systems with different approaches to the world but the same principles apply whether you are hacking a modern PC game, a 16 bit console game, a commodore 64 game or anything in between.
If you have a wired up control setup then throwing wires around might well be the easier option (you can always add another switch to turn things on or off, think like you might see for turbo controls), and if it is emulated then it too should have options.
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