AMSpiriT is an Amstrad CPC emulator currently for Windows, with a strong focus on accuracy. AMSpiriT aims to reproduce as closely as possible the hardware behavior of a real CPC:

Zilog Z80A processor, coded for T-state operation for increased emulation accuracy. It passes with success dedicated z80 tests (ZEXALL in particular)
Gate Array (AMSTRAD owner chip), which is emulated at 16 Mhz, for a fine management of memory access, color management, video display and interrupts.
Video controller (CRTC) in its 4 variants 0, 1, 2 and 4 (Pre-ASIC). It passes the majority of Shaker acid test
FDC µFD765 floppy disk controller for the management of floppy disk drives (partial emulation)
Sound generator AY_3_8912
Intel PPI_8255A chip (used as IO interface with the keyboard, the PSG, the tape reader)