![]() This avoids interrupting the CPU for long intervals but transfers are limited to 4 bytes per scan-line. Horizontal DMA (HDMA): Performs a small transfer after each horizontal scan (while the CRT beam is preparing to draw the next row).General Purpose DMA: Performs transfers at any time, bear in mind that the CPU is stopped until the transfer is finished.There are two DMAs to choose from depending on the needs : When a DMA is being set up, the origin must come from a different bus than the destination. 8-bit ‘B Bus’ controlled by the S-PPU: Connects the cartridge, CPU, WRAM, S-PPU and the Audio CPU.24-bit ‘A Bus’ controlled by the CPU: Connects the cartridge, CPU and WRAM. ![]()
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