Fast
Fast emulates the Atari ST/STe/Mega STe It was also the first to achieve fairly good redirection of floppy disk controller commands to the PC hardware floppy disk controller.
* Main processor (MC68000) 99%, cycle exact (except for the MUL and DIV instructions). Prefetch queue not emulated.
* Memory controllers (Glue, MMU, DMA) Floppy disk DMA redirected to hardware PC DMA. Memory configuration not emulated (set to 4MB).
* MFP (68901) 60%, cycle exact. No serial port nor Timer B emulation.
* Floppy disk controller (WD 1772) 80%, through direct PC drives redirection. Read Track/Write Track commands not emulated. No image disk support in this release.
* Video sub-system (Shifter, etc.) 10%, approximative VBL & HBL interrupts. Pixel drawing on access to ST screen buffer.
* Sound sub-system (YM-2149) 5%, emulation of some bits of port A (floppy disk). Registers shadowing. No sound at all.
* MIDI (ACIA 6850) 99,9%, redirected to MPU-401 compatible board, UART mode, or cycle exact ACIA faking.
* IKBD (ACIA 6850, HD6301V1P, etc.) 99,9% keyboard ACIA, cycle exact. 90% HD6301V1P and connections, cycle exact. No emulation of mouse and joystick ports inside the 6301.