Nov 29, 2024 · The NES has 2kB of RAM dedicated to the PPU, usually mapped to the nametable address space from $2000-$2FFF, but this can be rerouted through custom cartridge wiring. The mappings above are the addresses from …

Jan 17, 2024 · During the second cycle, the PPU only outputs the upper six bits of the address, with the octal latch providing the lower eight bits (VRAM addresses are 14 bits long). During this cycle, the value is read from or written to the lower eight address pins.

Oct 24, 2024 · During rendering, the PPU is actively using VRAM and OAM. This prevents the CPU from being able to access VRAM via PPUDATA or OAM via OAMDATA , so these accesses must be done outside of rendering: either during vblank (for data transfers during gameplay) or with rendering turned off (for large data transfers, such as when loading a level).

Aug 3, 2024 · VRAM: Video RAM. The PPU is connected to two external 32K x 8bit SRAM chips, called VRAM (Video RAM). The PPU accesses the VRAM in one of three modes, depending on context: 16 bit VRAM: Both VRAM chips are combined into a single 32K x 16bit (64KB) memory. Used for tile data (2/4/8 bpp), nametable data and offset-per-tile data.

The main data area is the VRAM, a 64 KB memory space that can be accessed with registers $2115, $2116, $2118, and $2139. This area is used for storing all the tiles used in your game, as well as the tile maps.

Jul 8, 2024 · Because the SNES only has 64 KiB of VRAM, VRAM address bit 15 has no effect. The VRAM can only be read during vertical-blank or force-blank. If the PPU is in horizontal-blank or active-display then the VRAM will not be read and vram_latch will contain invalid data.

Oct 5, 2022 · VRAM. Video RAM is 64KB and contained within the console. Additional video memory cannot be added via cartridge. VRAM contains the tilemaps used for backgrounds as well as the graphics data for background tiles and sprite tiles. You can decide how much VRAM to dedicate to each use, and there are registers that set the base address for different ...

Jun 16, 2024 · The PPU1 has dedicated address lines for each VRAM chip, labeled [VAA0-VAA13] and [VAB0-VAB13]. This wiring provides the ability to fetch two different bytes when Mode 7 makes tile data access non-linear. So far so good. But why is there not VAA14 and VAB14? Instead, I see a shared line VA14.

PPU has its own memory map, composed of PPU RAM, CHR ROM, and address space mirrors. PPU exposes 8 I/O Registers that are used by the CPU for communication. Those registers are mapped to [0x2000 - 0x2007] in the CPU memory map (and mirrored every 8 bytes through the region of [0x2008 .. 0x3FFF])

Mar 29, 2010 · During rendering, the PPU is actively using VRAM and OAM. This prevents the CPU from being able to access VRAM via PPUDATA or OAM via OAMDATA, so these accesses must be done outside of rendering: either during vblank (for data transfers during gameplay) or with rendering turned off (for large data transfers, such as when loading a level). To ...