Category:Mappers with scanline IRQs: Difference between revisions

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[[Category:Mappers with IRQs]]
[[Category:Mappers with IRQs]]
Mappers in this category have the ability to schedule an IRQ an arbitrary and continuously-adjustable number of scanlines in the future. Mappers with a fixed delay (even if clocked by PPU A12) don't count.
Mappers in this category have the ability to schedule an IRQ an arbitrary and continuously-adjustable number of scanlines in the future. This is triggered in response to a rendering signal such as [[PPU pin out and signal description|PPU A12]].


<!-- It is as-yet undecided whether the VRC4/6/7 scanline-like IRQs additionally belong here ... I kinda feel like they do, but tepples and rainwarrior have argued that they don't -->
Mappers with configurable [[:Category:Mappers with cycle IRQs|cycle-based IRQs]] can simulate a scanline-counter by waiting an equivalent number of CPU cycles, but have less robust horizontal timing, since they will fire relative to their start time, rather than relative to a rendering signal. The [[VRC IRQ]] has a convenient mode for this.
 
Mappers with a fixed delay (but still clocked by the PPU) should go in the [[:Category:Mappers with fixed-timing scanline IRQs|fixed-timing category]] instead.

Latest revision as of 20:51, 18 May 2015

Mappers in this category have the ability to schedule an IRQ an arbitrary and continuously-adjustable number of scanlines in the future. This is triggered in response to a rendering signal such as PPU A12.

Mappers with configurable cycle-based IRQs can simulate a scanline-counter by waiting an equivalent number of CPU cycles, but have less robust horizontal timing, since they will fire relative to their start time, rather than relative to a rendering signal. The VRC IRQ has a convenient mode for this.

Mappers with a fixed delay (but still clocked by the PPU) should go in the fixed-timing category instead.

Subcategories

This category has only the following subcategory.

Pages in category "Mappers with scanline IRQs"

The following 106 pages are in this category, out of 106 total.