I/O Port Summary

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This is a list of all known I/O ports of the Amstrad CPC, including all Peripherals. For a list showing only the built-in standard addresses see Default I/O Port Summary.

I/O Port Summary

I/O Decoded as Port Read Write
#1C00 %x0xxxx00 xxxxxxxx Dk'tronics Lightpen faulty mirror of #BCXX CRTC Index - Write
#1F00 %x0xxxx11 xxxxxxxx Dk'tronics Lightpen faulty mirror of #BFXX CRTC Data In Read -
#78XX ? 4Mb Memory extension - Write
#79XX ? 4Mb Memory extension - Write
#7AXX ? 4Mb Memory extension - Write
#7BXX ? 4Mb Memory extension - Write
#7CXX ? 4Mb Memory extension - Write
#7CXX %0xxxxx00 xxxxxxxx Aleste 520EX RAM Mapper page 0 (extended "Gate Array 3") Read Write
#7DXX ? 4Mb Memory extension - Write
#7DXX %0xxxxx01 xxxxxxxx Aleste 520EX RAM Mapper page 1 (extended "Gate Array 3") Read Write
#7EXX ? 4Mb Memory extension - Write
#7EXX %0xxxxx10 xxxxxxxx Aleste 520EX RAM Mapper page 2 (extended "Gate Array 3") Read Write
#7FXX ? 4Mb Memory extension - Write
#7FXX %0xxxxx11 xxxxxxxx Aleste 520EX RAM Mapper page 3 (extended "Gate Array 3") Read Write
#7FXX ? Dk'tronics memory expansion - Write
#7FXX ? Dobbertin Memory Expansion - Write
#7FXX %01xxxxxx xxxxxxxx Gate Array - Write
#7FXX %0xxxxxxx xxxxxxxx PAL extension to Gate Array for 128K RAM banking - Write
#BCXX %x0xxxx00 xxxxxxxx 6845 CRTC Index - Write
#BDXX %x0xxxx01 xxxxxxxx 6845 CRTC Data Out - Write
#BEXX %x0xxxx10 xxxxxxxx 6845 CRTC Status (as far as supported) Read -
#BFXX %x0xxxx11 xxxxxxxx 6845 CRTC Data In (as far as supported) Read -
#DFXX %xx0xxxxx xxxxxxxx Upper ROM Bank Number (as decoded within CPC664, CPC6128, 464+, 6128+, decoding in ROM expansions may be different) - Write
#ECXX %xxx0xx00 xxxxxxxx KC Compact CIO Port B (timer) Read Write
#EDXX %xxx0xx01 xxxxxxxx KC Compact CIO Port C (timer) Read Write
#EEXX %xxx0xx10 xxxxxxxx KC Compact CIO Control Read Write
#EEXX %xxx0xxx0 xxxxxxxx Aleste 520EX USART 8251 (RS232/Mouse) Data Read Write
#EFXX %xxx0xx11 xxxxxxxx KC Compact CIO Port A (Bi-drectional Printer Port) Read Write
#EFXX %xxx0xxx1 xxxxxxxx Aleste 520EX USART 8251 (RS232/Mouse) Control/Status Read Write
#EFXX %xxx0xxxx xxxxxxxx Printer Port - Write
#F0E0 ? Draysoft Doubler External Tape Data Input (Bit5) Read -
#F4XX %xxxx0x00 xxxxxxxx 8255 PIO Port A (PSG Data) Read Write
#F5XX %xxxx0x01 xxxxxxxx 8255 PIO Port B (Vsync,PrnBusy,Tape,etc.) Read -
#F6XX %xxxx0x10 xxxxxxxx 8255 PIO Port C (KeybRow,Tape,PSG Control) - Write
#F7XX %xxxx0x11 xxxxxxxx 8255 PIO Control-Register - Write
#F8B0 ? Vidi-CPC Video-Digitiser, CRTC Index ? Write
#F8B1 ? Vidi-CPC Video-Digitiser, CRTC Data ? Write
#F8DC ? CPCI Serial Interface MC6850 Control/Status Read Write
#F8DD ? CPCI Serial Interface MC6850 Data Read Write
#F8E0 ? DHCP MIDI Interface Read Write
#F8E0 %11111000 11100000 Schneider RS232 Interface Z80-STI Indirect Data Register Read Write
#F8E1 %11111000 11100001 Schneider RS232 Interface Z80-STI General Purpose I/O Data Register Read Write
#F8E2 %11111000 11100010 Schneider RS232 Interface Z80-STI Interrupt Pending Register B (unused) Read Write
#F8E2 ? Dobbertin Eprommer 4003 ? ?
#F8E3 %11111000 11100011 Schneider RS232 Interface Z80-STI Interrupt Pending Register A (unused) Read Write
#F8E3 ? Dobbertin Eprommer 4003 ? ?
#F8E4 %11111000 11100100 Schneider RS232 Interface Z80-STI Interrupt in-Service Register B (unused) Read Write
#F8E4 ? Dobbertin Eprommer 4003 ? ?
#F8E5 %11111000 11100101 Schneider RS232 Interface Z80-STI Interrupt in-Service Register A (unused) Read Write
#F8E6 %11111000 11100110 Schneider RS232 Interface Z80-STI Interrupt Mask Register B (unused) Read Write
#F8E6 ? Port A - IDE8255 ? ?
#F8E7 %11111000 11100111 Schneider RS232 Interface Z80-STI Interrupt Mask Register A (unused) Read Write
#F8E7 ? Port C - IDE8255 ? ?
#F8E8 %11111000 11101000 Schneider RS232 Interface Z80-STI Indirect Index and Interrupt Vector Register Read Write
#F8E8 ? Music Machine Interrupt Sel - Write
#F8E9 %11111000 11101001 Schneider RS232 Interface Z80-STI Timers A and B Control Register (unused) Read Write
#F8EA %11111000 11101010 Schneider RS232 Interface Z80-STI Timer B Data Register (unused) Read Write
#F8EB %11111000 11101011 Schneider RS232 Interface Z80-STI Timer A Data Register (unused) Read Write
#F8EC %11111000 11101100 Schneider RS232 Interface Z80-STI USART Control Register Read Write
#F8EC ? Music Machine ACIA Control - Write
#F8ED ? Music Machine ACIA Data Write - Write
#F8ED %11111000 11101101 Schneider RS232 Interface Z80-STI Receiver Status Register Read Write
#F8EE ? Music Machine ACIA Status Read -
#F8EE %11111000 11101110 Schneider RS232 Interface Z80-STI Transmitter Status Register Read Write
#F8EF %11111000 11101111 Schneider RS232 Interface Z80-STI USART Data Register Read Write
#F8EF ? Music Machine ACIA Data Read Read -
#F8F0 ? Music Machine DAC Write - Write
#F8F2 ? EMR MIDI Interface - Write
#F8F2 ? Dobbertin Eprommer 4003 ? ?
#F8F4 ? Music Machine ADC Read Read -
#F8F5 ? ARA Video Digitizer - Read Sync Signal (bit0) Read -
#F8F8 ? Music Machine ADC Start - Write
#F8FF %1111100x 111xxxxx CPCISA control port - Write
#F8FF N/A Peripheral Soft Reset (MC_BOOT_PROGRAM and MC_START_PROGRAM do OUT [F8FF],FF) - Write
#F9B0 ? Vidi-CPC Video-Digitiser, Config (W) and Capture Data (R) Read Write
#F9E6 ? Port B - IDE8255 ? ?
#F9E7 ? RS Port - IDE8255 ? ?
#F9F5 ? ARA Video Digitizer - Reset 10bit Config Value - Write
#F9F7 ? Hegotron grafpad II ? ?
#F9FC - #F9FE ? Otten & Fecht 1 MB RAM-Disc Read Write
#F9FF ? Hegotron grafpad II ? ?
#FA7E %xxxxx0x0 0xxxxxxx Floppy Motor Control (for 765 FDC) - Write
#FABC %xxxxx0x0 10xxxx00 Aleste 520EX EXTPORT with CS53: Forward PPI Port A to 8253 Timer 0 - Write
#FABD %xxxxx0x0 10xxxx01 Aleste 520EX EXTPORT with CS53: Forward PPI Port A to 8253 Timer 1 - Write
#FABE %xxxxx0x0 10xxxx10 Aleste 520EX EXTPORT with CS53: Forward PPI Port A to 8253 Timer 2 - Write
#FABF %xxxxx0x0 10xxxx11 Aleste 520EX EXTPORT with CS53: Forward PPI Port A to 8253 Control - Write
#FABF %xxxxx0x0 10xxxxxx Aleste 520EX EXTPORT (config for internal hardware) - Write
#FADC ? Amstrad Serial Interface Z80-SIO / DART port A Data Register Read Write
#FADD ? Amstrad Serial Interface Z80-SIO / DART port A Control Reg. Read Write
#FADE ? Amstrad Serial Interface Z80-SIO / DART port B Data Register Read Write
#FADF ? Amstrad Serial Interface Z80-SIO / DART port B Control Reg. Read Write
#FAE6 ? Port A - IDE8255 ? ?
#FAE7 ? Port C - IDE8255 ? ?
#FAEE ? Amstrad SSA-1 Speech Synthesizer (faulty mirror used by included RSX driver) Read Write
#FAEF ? Kempston Mouse - Mouse Buttons Read -
#FAF5 ? ARA Video Digitizer - Read Capture Data Read -
#FAF5 ? ARA Video Digitizer - Increment 10bit Config Value - Write
#FB7E %xxxxx0x1 0xxxxxx0 765 FDC (internal) Status Register Read -
#FB7F %xxxxx0x1 0xxxxxx1 765 FDC (internal) Data Register Read Write
#FBBD ? Ram select mode Vortex SP512 ? Write
#FBDC ? Amstrad Serial Interface 8253 Timer counter 0 Read Write
#FBDD ? Amstrad Serial Interface 8253 Timer counter 1 Read Write
#FBDE ? Amstrad Serial Interface 8253 Timer counter 2 Read Write
#FBDF ? Amstrad Serial Interface 8253 Timer Modus Select - Write
#FBxx+0 ? CPCI Real Time Clock Index (DIY) - Write
#FBxx+1 ? CPCI Real Time Clock Data (DIY) Read Write
#FBE0 - #FBE3 ? Dk'tronics Real Time Clock ? ?
#FBE0 ? Dobbertin Harddisc Data Port Read Write
#FBE1 ? Dobbertin Harddisc Status, Reset Read Write
#FBE2 ? Dobbertin Harddisc Select, Configuration Read Write
#FBE3 ? Dobbertin Harddisc DMA, Interrupt Read Write
#FBE4 ? Dobbertin Harddisc Reset Read Write
#FBE6 ? Port B - IDE8255 ? ?
#FBE7 ? RS Port - IDE8255 ? ?
#FBE7 ? ACU Real Time Clock (DIY) Z80-PIO Data In/Out Port A Read Write
#FBE8 ? Dk'tronics Real Time Clock ? ?
#FBE8 ? KDS RS232 8253 Timer0 (RX Clock) Read Write
#FBE9 ? KDS RS232 8253 Timer1 (TX Clock) Read Write
#FBEA ? KDS RS232 8253 Timer2 (not used) Read Write
#FBEB ? KDS RS232 8253 Timer Control - Write
#FBEC ? KDS RS232 6850 (reversed bit-order) Control - Write
#FBEC ? PDS development system Z80 PIO Port A Data (8bit data to/from PC) Read Write
#FBED ? KDS RS232 6850 (reversed bit-order) TX Data - Write
#FBED ? PDS development system Z80 PIO Port B Data (handshake to/from PC) Read Write
#FBEE ? PDS development system Z80 PIO Port A Control ? Write
#FBEE ? Amstrad SSA-1 Speech Synthesizer Read Write
#FBEE ? Kempston Mouse - 8bit X position Read -
#FBEE ? KDS RS232 6850 (reversed bit-order) Status Read -
#FBEF ? PDS development system Z80 PIO Port B Control ? Write
#FBEF ? Kempston Mouse - 8bit Y position Read -
#FBEF ? KDS RS232 6850 (reversed bit-order) RX Data Read -
#FBEF ? ACU Real Time Clock (DIY) Z80-PIO Data In/Out Port B Read Write
#FBF0 - #FBFF ? Otten & Fecht 1 MB RAM-Disc Read Write
#FBF5 ? ARA Video Digitizer - Invoke Video Capture - Write
#FBF6 ? Vortex Disc Drives 765 FDC (Vortex,ext) Status Register Read -
#FBF7 ? Vortex Disc Drives 765 FDC (Vortex,ext) Data Register Read Write
#FBF7 ? ACU Real Time Clock (DIY) Z80-PIO Configure Port A Read Write
#FBF8 %11111011 11111000 8bit Printer Port (Amstrad Action) Strobe/Busy Read Write
#FBF9 %11111011 11111001 8bit Printer Port (Amstrad Action) Data - Write
#FBFE ? Magnum Light Phaser - Write
#FBFE ? Dart Scanner for DMP-Printers Read ?
#FBFE ? Dk'tronics Speech Synthesizer Read Write
#FBFE ? TMPI speech synthesizer Data Register Write
#FBFF ? TMPI speech synthesizer Command/Status Register Read Write
#FBFF ? ACU Real Time Clock (DIY) Z80-PIO Configure Port B Read Write
#FC00 - #FDFF %1111110x xxxxxxxx CPCISA 16bits mode high byte latch Read Write
#FC5C ? French DIY Dual Port RS232 - Baudrate Selection - Write
#FC7C ? French DIY Dual Port RS232 - Z80-SIO Channel A Data Read Write
#FC7D ? French DIY Dual Port RS232 - Z80-SIO Channel A Control/Status Read Write
#FC7E ? French DIY Dual Port RS232 - Z80-SIO Channel B Data Read Write
#FC7F ? French DIY Dual Port RS232 - Z80-SIO Channel B Control/Status Read Write
#FCE6 ? Port A - IDE8255 Read Write
#FCE7 ? Port C - IDE8255 Read Write
#FD00 - #FD3F %11111101 00xxxxxx SYMBiFACE II Read Write
#FDE6 ? Port B - IDE8255 Read Write
#FDE7 ? RS Port - IDE8255 Read Write
#FE00 - #FFFF %1111111x xxxxxxxx CPCISA I/O access (low byte) Read Write
#FEE6 ? Port A - IDE8255 Read Write
#FEE7 ? Port C - IDE8255 Read Write
#FEE8 %11111110 1110100x Multiface II - Enable Multiface II ROM/RAM - Write
#FEEA %11111110 1110110x Multiface II - Disable Multiface II ROM/RAM - Write
#FFXX %11111111 xxxxxxxx CPC Booster (XX=#00..#28 are used now) Read Write
#FFXX %11111111 xxxxxxxx Amdrum (unsigned 8bit DAC) - Write
#FFE6 ? Port B - IDE8255 Read Write
#FFE7 ? RS Port - IDE8255 Read Write

Memory Mapped I/O Ports

Mem Decoded as Port Read Write
#4000-7FFF %01xxxxxx xxxxxxxx ASIC - CPC+/GX4000 registers Read Write
#???? %11xxxxxx xxxxxxx1 Dobbertin Smart Watch data read (D0=data) Read -
#???? %11xxxxxx xxxxxDx0 Dobbertin Smart Watch data write (A2=data) Read -

Other I/O Ports

A number of peripherals connect to the joystick/printer ports, and so, they do not include "own" I/O addresses. This includes hardware other than joysticks/printers - for example, mice, robots, audio devices, and simple network adapters. For a more complete list, see corresponding sections on Digital Joystick and Printer Port pages.

Aside from I/O addresses, there are some other important I/O signals, for example: NMI.

CPCISA ports for ISA cards

Device PC I/O range CPCISA high CPCISA low
IDE1 1F0h..1F7h #FDF0..#FDF7 #FFF0..#FFF7
IDE2 170h..177h #FD70..#FD77 #FF70..#FF77
Joystick 201h..201h #FC01..#FC01 #FE01..#FE01
Ethernet 210h..21Fh #FC10..#FC1F #FE10..#FE1F
Sound Blaster 220h..23Fh #FC20..#FC3F #FE20..#FE3F
LPT2 278h..27Fh #FC78..#FC7F #FE78..#FE7F
COM1 2F8h..2FFh #FCF8..#FCFF #FEF8..#FEFF
MIDI' 300h..301h #FD00..#FD01 #FF00..#FF01
MIDI 330h..331h #FD30..#FD31 #FF30..#FF31
Sound control 370h..371h #FD70..#FD71 #FF70..#FF71
FDC1 372h..377h #FD72..#FD77 #FF72..#FF77
LPT1 378h..37Fh #FD78..#FD7F #FF78..#FF7F
Sound AD-LIB 388h..38Bh #FD88..#FD8B #FF88..#FF8B
VGA 3B0h..3BBh #FDB0..#FDBB #FFB0..#FFBB
LPT3 3BCh..3BFh #FDBC..#FDBF #FFBC..#FFBF
VGA 3C0h..3DFh #FDC0..#FDCF #FFC0..#FFCF
FDC1 3F2h..3F7h #FDF2..#FDF7 #FFF2..#FFF7
COM1 3F8h..3FFh #FDF8..#FDFF #FFF8..#FFFF

CPCISA ports for ISA motherboard

Device PC I/O range CPCISA high CPCISA low
DMA 000h..00Fh #FC00..#FC0F #FE00..#FE0F
interrupt 020h..03Fh #FC20..#FC3F #FE20..#FE3F
counter 040h..05Fh #FC40..#FC5F #FE40..#FE5F
keyboard 060h..067h #FC60..#FC67 #FE60..#FE67
RTC 070h..071h #FC70..#FC71 #FE70..#FE71
DMA 080h..08Fh #FC80..#FC8F #FE80..#FE8F
DMA 0C0h..0DFh #FCC0..#FCDF #FEC0..#FEDF
interrupt 0A0h..0BFh #FCA0..#FCBF #FEA0..#FEBF
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