bZSNES emulates almost all of the major features of ZSNES:
◦VRAM can be written at any time, even while screen is rendering
◦OAM and CGRAM can also be written at any time
◦DSP echo buffer writes do not interfere with APURAM
◦DRAM does not need to be periodically refreshed
◦H/DMA synchronization does not steal CPU time
◦auto joypad polling results can be read immediately
◦CPU multiplication and division register results can be read immediately
◦mid-scanline writes to PPU registers do not interfere with video output
◦PPU background and sprite layers can be individually toggled on and off
◦DSP voice channels can be individually toggled on and off
◦CPU speed can be adjusted from its official frequency
◦... and more!
