$2007: PPUDATA (read)
()
| 338 | |
| 339 | // $2007: PPUDATA (read) |
| 340 | func (ppu *PPU) readData() byte { |
| 341 | value := ppu.Read(ppu.v) |
| 342 | // emulate buffered reads |
| 343 | if ppu.v%0x4000 < 0x3F00 { |
| 344 | buffered := ppu.bufferedData |
| 345 | ppu.bufferedData = value |
| 346 | value = buffered |
| 347 | } else { |
| 348 | ppu.bufferedData = ppu.Read(ppu.v - 0x1000) |
| 349 | } |
| 350 | // increment address |
| 351 | if ppu.flagIncrement == 0 { |
| 352 | ppu.v += 1 |
| 353 | } else { |
| 354 | ppu.v += 32 |
| 355 | } |
| 356 | return value |
| 357 | } |
| 358 | |
| 359 | // $2007: PPUDATA (write) |
| 360 | func (ppu *PPU) writeData(value byte) { |