I/O Port Summary

The is a list of all known I/O ports of the Amstrad CPC (copied from the FutureOS manual).

I/O	Port	Read	Write
#7FXX	Gate Array		Write
#BCXX	6845 CRTC Address-Register	-	Write
#BDXX	6845 CRTC Data-Register	-	Write
#BEXX	6845 CRTC Status-Register	Read	-
#BFXX	6845 CRTC Video-Address-Register	Read	-
#BDXX	select ROM	-	Write
#EFXX	Printer Port	-	Write
#F4XX	8255 PIO Port A	Read	Write
#F5XX	8255 PIO Port B	Read	-
#F6XX	8255 PIO Port C	-	Write
#F7XX	8255 PIO Control-Register	-	Write
#F8B0	Vidi-CPC Video-Digitiser	?	?
#F8B1	Vidi-CPC Video-Digitiser	?	?
#F8DC - #F8DD	CPCI Serial Interface	Read	Write
#F8E0	Z80 STI Indirect Data Register	Read	Write
#F8E1	Z80 STI Gen. Purpose I/O Interrupt	Read	Write
#F8E8	Z80 STI Pointer Vector Register	Read	Write
#F8E8	Music Machine	-	Write
#F8EC	Z80 STI USART Control Register	Read	Write
#F8EC	Music Machine	-	Write
#F8ED	Z80 STI Receiver Status Register	Read	Write
#F8EE	Z80 STI Transmitter Status Register	Read	Write
#F8EF	Z80 STI USART Data Register	Read	Write
#F8EF	Music Machine	Read	-
#F8E2 - #F8E4	Dobbertin Eprommer 4003	?	?
#F8F0	Music Machine	-	Write
#F8F2	Dobbertin Eprommer 4003	?	?
#F8F4	Music Machine	Read	-
#F8F8	Music Machine	-	Write
#F8FF	CPCISA control port	-	Write
#F9B0	Vidi-CPC Video-Digitiser	?	?
#F9FC - #F9FE	Otten & Fecht 1 MB RAM-Disc	?	?
#FA7E	Floppy Motor Control	-	Write
#FADC	Z80-SIO / DART port A Data Register	Read	Write
#FADD	Z80-SIO / DART port A Control Reg.	Read	Write
#FADE	Z80-SIO / DART port B Data Register	Read	Write
#FADF	Z80-SIO / DART port B Control Reg.	Read	Write
#FB7E	765 FDC (internal) Status Register	Read	-
#FB7F	765 FDC (internal) Data Register	Read	Write
#FBDC	8253 Timer counter 0	Read	Write
#FBDD	8253 Timer counter 1	Read	Write
#FBDE	8253 Timer counter 2	Read	Write
#FBDF	8253 Timer Modus Select	-	Write
#FBE0	Hard Disc Data Port	Read	Write
#FBE1	Hard Disc Status, Reset	Read	Write
#FBE2	Hard Disc Select, Configuration	Read	Write
#FBE3	Hard Disc DMA, Interrupt	Read	Write
#FBE4	Hard Disc Reset	Read	Write
#FBE0 - #FBE3	dk'tronics RTC.	?	?
&FBE8	dk'tronics RTC.	?	?
#FBEE	SSA1 dk'tronics Speech-Module	Read	Write
#FBF0 - #FBFF	Otten & Fecht 1 MB RAM-Disc	?	?
#FBF6	765 FDC (Vortex,ext) Status Register	Read	-
#FBF7	765 FDC (Vortex,ext) Data Register	Read	Write
#FC00 - #FDFF	CPCISA 16bits mode latch	Read	Write
#FD00 - #FD3F	SYMBiFACE II	Read	Write
#FE00 - #FFFF	CPCISA I/O access	Read	Write
#FEE8	Multiface II	?	?
#FEEA	Multiface II	?	?
#FF00 - #FF2F	CPC Booster	Read	Write