The 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]]. The original list of I/O ports was taken from the [[FutureOS]] handbook. == I/O Port Summary ==Note: While most of these devices can be reached via a range of addresses due to the partial address decoding, code should never use any address other than the canonical one (all 'x'/don't care positions filled by 1's). Otherwise multiple devices will be enabled simultaneously, which is unlikely to be what you want.
{|{{Prettytable|width: 700px; font-size: 2em;}}
|'''I/O'''||'''Decoded as'''||'''Port'''||'''Read'''||'''Write'''
|-
|#78XX1C00||?%x0xxxx00 xxxxxxxx||[[CPC4MB|4Mb Memory extensionDk'tronics Lightpen]] faulty mirror of #BCXX [[CRTC]]Index||-||Write
|-
|#79XX1F00||?%x0xxxx11 xxxxxxxx||[[CPC4MB|4Mb Memory extensionDk'tronics Lightpen]]faulty mirror of #BFXX [[CRTC]] Data In||-Read ||Write-
|-
|#7AXX78XX||?%0xxxx000 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write
|-
|#7BXX79XX||?%0xxxx001 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write
|-
|#7CXX7AXX||?%0xxxx010 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write
|-
|#7DXX7BXX||?%0xxxx011 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write
|-
|#7EXX7CXX||?%0xxxx100 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write
|-
|#7CXX||%0xxxxx00 xxxxxxxx||[[Aleste 520EX]] RAM Mapper page 0 (extended "Gate Array 3")||Read||Write|-|#7DXX||%0xxxx101 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write|-|#7DXX||%0xxxxx01 xxxxxxxx||[[Aleste 520EX]] RAM Mapper page 1 (extended "Gate Array 3")||Read||Write|-|#7EXX||%0xxxx110 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write|-|#7EXX||%0xxxxx10 xxxxxxxx||[[Aleste 520EX]] RAM Mapper page 2 (extended "Gate Array 3")||Read||Write |- |#7EXX||%0xxxxxx0 xxxxxxxx||[[Y-MEM]] 512K RAM Expansion part||Read||Write |-|#7FXX||?%0xxxx111 xxxxxxxx||[[CPC4MB|4Mb Memory extension]]||-||Write|-|#7FXX||%0xxxxx11 xxxxxxxx||[[Aleste 520EX]] RAM Mapper page 3 (extended "Gate Array 3")||Read||Write|- |#7FXX||%0xxxxxx1 xxxxxxxx||[[X-MEM]] 512K RAM Expansion part||Read||Write
|-
|#7FXX||?||[[Dk'tronics memory expansion]]||-||Write
|#7FXX||?||[[Dobbertin Memory Expansion]]||-||Write
|-
|#7FXX||%0111xxxx 01xxxxxx xxxxxxxx||[[Gate Array]]||-||Write
|-
|#BCXX7FXX||%x0xxxx00 0xxxxxxx xxxxxxxx||6845 [[CRTCPAL16L8]] Address-Registerextension to [[Gate Array]] for 128K RAM banking|| - ||Write
|-
|#BDXXBCXX||%x0xxxx01 x0xxxx00 xxxxxxxx||6845 [[CRTC]] Data-RegisterIndex|| - ||Write
|-
|#BEXXBDXX||%x0xxxx10 x0xxxx01 xxxxxxxx||6845 [[CRTC]] Status-RegisterData Out||Read- || - Write
|-
|#BFXXBEXX||%x0xxxx11 x0xxxx10 xxxxxxxx||6845 [[CRTC]] Video-Address-RegisterStatus (as far as supported)||Read|| -
|-
|#BFXX||%x0xxxx11 xxxxxxxx||6845 [[CRTC]] Data In (as far as supported)||Read|| - |-|#DFXX||%xx0xxxxx xxxxxxxx||select [[Upper ROMBank 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
|#F7XX||%xxxx0x11 xxxxxxxx||[[8255]] PIO Control-Register|| - ||Write
|-
|#F8B0F880-#F88F||?%1111100x 1000xxxx||[[VIDI digitizer|Vidi-CPC Video-DigitiserPlayCity]]Expansion CTC channels and YMZ data||?- ||?Write
|-
|#F8B1F890-#F89F||?%1111100x 1--1xxxx||[[VIDI digitizer|Vidi-CPC Video-DigitiserMultiPlay]]Expansion (mirror port, use #F9xx)||?Read ||?-
|-
|#F8DC F8A0- #F8DDF8AF||?%11111000 1010xxxx||[[CPCI RS232 Interface|CPCI Serial InterfaceX-CPC]]ClockPort RTC||Read||Write
|-
|#F8E0F8B0||?||[[DHCP Midi InterfaceVIDI digitizer|Vidi-CPC Video-Digitiser]], CRTC Index||Read?||Write
|-
|#F8E0F8B1||?||[[Schneider RS232 InterfaceVIDI digitizer|Vidi-CPC Video-Digitiser]] Z80 STI Indirect , CRTC Data Register||Read?||Write
|-
|#F8E1F8DC||?||[[CPCI RS232 Interface|CPCI Serial Interface]] MC6850 Control/Status||Read||Write|-|#F8DD||?||[[CPCI RS232 Interface|CPCI Serial Interface]] MC6850 Data||Read||Write|-|#F8E0||?||[[DHCP MIDI Interface]]||Read||Write|-|#F8E0||%11111000 11100000||[[Schneider RS232 Interface]] Z80 -STI Gen. 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||?||[[Universeller EPROM Programmer 4004|Dobbertin Eprommer 4003]]||?||?|-|#F8E3||%11111000 11100011||[[Schneider RS232 Interface]] Z80-STI Interrupt Pending Register A (unused)||Read||Write|-|#F8E3||?||[[Universeller EPROM Programmer 4004|Dobbertin Eprommer 4003]]||?||?|-|#F8E4||%11111000 11100100||[[Schneider RS232 Interface]] Z80-STI Interrupt in-Service Register B (unused)||Read||Write|-|#F8E4||?||[[Universeller EPROM Programmer 4004|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 InterruptMask 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 Pointer Indirect Index and Interrupt Vector Register||Read||Write
|-
|#F8E8||?||[[Music Machine]]Interrupt Sel|| - ||Write
|-
|#F8ECF8E9||?%11111000 11101001||[[Schneider RS232 Interface]] Z80 -STI USART Timers A and B Control Register(unused)||Read||Write
|-
|#F8ECF8EA||?%11111000 11101010||[[Music MachineSchneider RS232 Interface]]Z80-STI Timer B Data Register (unused)|| - Read||Write
|-
|#F8EDF8EB||?%11111000 11101011||[[Schneider RS232 Interface]] Z80 -STI Receiver Status Timer A Data Register(unused)||Read||Write
|-
|#F8EEF8EC||?%11111000 11101100||[[Schneider RS232 Interface]] Z80 -STI Transmitter Status USART Control Register||Read||Write
|-
|#F8EFF8EC||?||[[Schneider RS232 InterfaceMusic Machine]] Z80 STI USART Data RegisterACIA Control||Read- ||Write
|-
|#F8EFF8ED||?||[[Music Machine]]ACIA Data Write||Read- || - Write
|-
|#F8E2 - #F8E4F8ED||?%11111000 11101101||[[Universeller EPROM Programmer 4004|Dobbertin Eprommer 4003Schneider 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|| - |-|#F8FX||%xxxxx0xx 1111NNNx||[[Maplins 8bit Input Port]] and [[Maplins Weather Satellite Receiver]]||Read|| -|-|#F8F0||?||[[Music Machine]]DAC Write|| - ||Write
|-
|#F8F2||?||[[EMR MIDI Interface]]|| - ||Write
|-
|#F8F2||?||[[Universeller EPROM Programmer 4004|Dobbertin Eprommer 4003]]||?Read||?Write
|-
|#F8F4||?||[[Music Machine]]||Read|| -
|-
|#F8F8F8F2||?||[[Music MachineEMR MIDI Interface]]|| - Read||Write
|-
|#F8F4||?||[[Music Machine]] ADC Read||Read|| - |-|#F8F5||?||[[ARA Video Digitizer]] - Read Sync Signal (bit0)||Read|| - |-|#F8F8||?||[[Music Machine]] ADC Start|| - ||Write|-|#F8F8||?||[[ANTA 64K Memory Expansion]] ANTA 64k.3 latch||Read||Write|-|#F8FE||%11111000 11111110||[[Z-MEM]] Software Memory Configuration|| - || Write|-|#F8FF||%1111100x 111xxxxx||[[CPCISA by Yarek|CPCISA control port]]|| - ||Write|-|#F8FF||%xxxxx0xx 111111xx||[[Peripheral Soft Reset]] (MC_BOOT_PROGRAM and MC_START_PROGRAM do OUT [F8FF],FF)|| - ||Write|-|#F980-#F98F||%1111100x 1000xxxx||[[PlayCity]] Expansion CTC channels (mirror) and YMZ registers|| - || Write|-|#F990-#F99F||%1111100x 1--1xxxx||[[MultiPlay]] Expansion|| Read || - |-|#F9A0-#F9AF||%11111001 1010xxxx||[[X-CPC]] ClockPort SPR|| Read || Write |-|#F9B0||?||[[VIDI digitizer|Vidi-CPC Video-Digitiser]], Config (W) and Capture Data (R)||Read||Write|-|#F9D0||%11111000 11010000||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] SwinSID1 + SwinSID2 DATA (MONO Mode / 3 Channels)||-||Write|-|#F9D1||%11111000 11010001||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] SwinSID1 (LEFT) DATA (STEREO Mode / 6 Channels)||-||Write|-|#F9D2||%11111000 11010010||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] SwinSID2 (RIGHT) DATA (STEREO Mode / 6 Channels)||-||Write|-|#F9DC||?||[[Panda Electronics Communications Interface Unit]] PPI Port A - 8bit Printer data||Read||Write|-|#F9DD||?||[[Panda Electronics Communications Interface Unit]] PPI Port B - 8bit general purpose I/O port||Read||Write|-|#F9DE||?||[[Panda Electronics Communications Interface Unit]] PPI Port C - Handshake (bit0=Strobe.out, Bit5=Busy.in)||Read||Write
|-
|#F9B0F9DF||?||[[VIDI digitizer|Vidi-CPC Video-DigitiserPanda Electronics Communications Interface Unit]]PPI Control - 8bit Printer data||?- ||?Write
|-
|#F9E6||?||Port B - [[IDE8255]]||?||?
|-
|#F9E7||?||RS Port - [[IDE8255]]||?||?
|-
|#F9F5||?||[[ARA Video Digitizer]] - Reset 10bit Config Value|| - ||Write
|-
|#F9F7||?||[[Grafpad II|Hegotron grafpad II]]||?||?
|#F9FF||?||[[Grafpad II|Hegotron grafpad II]]||?||?
|-
|#FA7E||%xxxxxx0x0 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|-|#FAD0||%11111010 11010000||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] Select SID (1&2) Register MONO mode||-||Write|-|#FAD1||%11111010 11010001||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] Select SID1 Register||-||Write|-|#FAD2||%11111010 11010010||[[Sid|SwinSID part of SONIQUE Sound Board WIP]] by [[User:DaDMaN|DaDMaN]] Select SID2 Register|| - ||Write
|-
|#FADC||?||[[Amstrad Serial Interface]] Z80-SIO / DART port A Data Register||Read||Write
|-
|#FADC||?||[[RS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] 8251 USART data|| Read || Write
|-
|#FADD||?||[[Amstrad Serial Interface]] Z80-SIO / DART port A Control Reg.||Read||Write
|-
|#FADD||?||[[RS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] 8251 USART control/status|| 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
|-
|#FADF||?||[[Cirkit serial interface]] 8251 UART data register||Read||Write
|-
|#FAE6||?||Port A - [[IDE8255]]||?||?
|#FAE7||?||Port C - [[IDE8255]]||?||?
|-
|#FB7EFAEE||%xxxxxx0x1 0xxxxxx0?||[[765 FDCAmstrad SSA-1 Speech Synthesizer]] (internalfaulty mirror used by included RSX driver) Status Register||Read|| - Write
|-
|#FB7FFAEF||%xxxxxx0x1 0xxxxxx1xxxxx0x0 xxx0xxxx||[[765 FDCKempston Mouse]] (internal) Data Register- Mouse Buttons||Read||Write-
|-
|#FBBDFAF5||?||[[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||%xxxxx0xx x0xxxx0x||Ram select mode [[Vortex Expansions RAM card|Vortex SP512]]||?||Write
|-
|#FBDC||?||[[Amstrad Serial Interface]] 8253 Timer counter 0||Read||Write
|-
|#FBDC||?||[[RS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] 8253 timer 0 (transmit baudrate)|| Read || Write
|-
|#FBDD||?||[[Amstrad Serial Interface]] 8253 Timer counter 1||Read||Write
|-
|#FBDD||?||[[RS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] 8253 timer 1 (receive baudrate)|| Read || Write
|-
|#FBDE||?||[[Amstrad Serial Interface]] 8253 Timer counter 2||Read||Write
|-
|#FBDE||?||[[RS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] 8253 timer 2 (used as 1ms timer)|| Read || Write
|-
|#FBDF||?||[[Amstrad Serial Interface]] 8253 Timer Modus Select|| - ||Write
|-
|#FBxxFBDF||?||[[Real Time ClockRS-232 para Amstrad|MHT Ingenieros RS232 para Amstrad]] (DIY)8253 timer 0-2 control||?- ||?Write
|-
|#FBE0 - #FBE3FBDF||?||[[Dk'tronics Real Time ClockCirkit serial interface]]8251 UART status/control register||?Read||?Write
|-
|#FBE0FBxx+0||?||Hard Disc Data PortCPCI [[Real Time Clock]] Index (DIY)||Read-||Write
|-
|#FBE1FBxx+1||?||Hard Disc Status, ResetCPCI [[Real Time Clock]] Data (DIY)||Read||Write
|-
|#FBE2FBE0||?||Hard Disc Select, Configuration[[Dk'tronics Real Time Clock]] - Z80 PIO Port A Data (HD146818P RTC Data bus)||Read||Write
|-
|#FBE3FBE0||?||Hard Disc DMA, Interrupt[[Dobbertin Harddisc]] Data Port||Read||Write
|-
|#FBE1||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port B Data (General Purpose 8bit I/O Port)|| Read || Write|-|#FBE1||?||[[Dobbertin Harddisc]] Status, Reset||Read||Write|-|#FBE2||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port A Control||?|| Write|-|#FBE2||?||[[Dobbertin Harddisc]] Select, Configuration||Read||Write|-|#FBE3||?||[[Dk'tronics Real Time Clock]] - Z80 PIO Port B Control||?|| Write|-|#FBE3||?||[[Dobbertin Harddisc]] DMA, Interrupt||Read||Write|-|#FBE4||?||Hard Disc [[Dobbertin Harddisc]] Reset||Read||Write
|-
|#FBE6||?||Port B - [[IDE8255]]||?||?
|#FBE7||?||RS Port - [[IDE8255]]||?||?
|-
|#FBE8FBE7||?||[[Dk'tronics ACU Real Time Clock(DIY)]]Z80-PIO Data In/Out Port A ||?Read||?Write
|-
|#FBE8||?||[[KDS_Electronics_Serial_Interface|KDS RS232Dk'tronics Real Time Clock]] 8253 Timer0 "4bit latch" (RX Clockdetails unknown)||?||?Write
|-
|#FBE9FBE8||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 8253 Timer1 Timer0 (TX RX Clock)||?Read||?Write
|-
|#FBEAFBE9||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 8253 Timer2 Timer1 (not usedTX Clock)||?Read||?Write
|-
|#FBEA||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 8253 Timer2 (not used)||Read||Write|-|#FBEB||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 8253 Timer Control||?-||?Write
|-
|#FBEC||?||[[KDS_Electronics_Serial_Interface|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_Electronics_Serial_Interface|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||%xxxxx0x1 xxx0xxx0||[[Kempston Mouse]] - 8bit X position||Read||-
|-
|#FBEE||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) Status||Read||-
|-
|#FBEF||?||[[PDS development system]] Z80 PIO Port B Control||?||Write
|-
|#FBEF||%xxxxx0x1 xxx0xxx1||[[Kempston Mouse]] - 8bit Y position||Read||-
|-
|#FBEF||?||[[KDS_Electronics_Serial_Interface|KDS RS232]] 6850 (reversed bit-order) RX Data||Read||-
|-
|#FBEEFBEF||?||[[Amstrad SSA-1 Speech SynthesizerACU Real Time Clock (DIY)]]Z80-PIO Data In/Out Port B ||Read||Write
|-
|#FBF0 - #FBFF||?||[[Otten & Fecht 1 MB RAM-Disc]]||Read||Write
|-
|#FBF0||%xxxx1011 1111xxxx||[[AMRAM2]]||-||Write
|-
|#FBF0||%xxxxx011 1111xxx0||[[AMSSIO]] Serial Interface MC6850 Control/Status Register||Read||Write
|-
|#FBF1||%xxxxx011 1111xxx1||[[AMSSIO]] Serial Interface MC6850 Data Register||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||?||[[Amstrad Magnum Phaser|Magnum Light Phaser]]||-||Write
|-
|#FBFE||?||[[Dart Scanner for DMP-Printers]]||Read||?
|-
|#FBFE||?||[[Dk'tronics Speech Synthesizer]]||Read||Write
|-
|#FBFE||?%xxxxxxxx 11111110||[[TMPI speech synthesizer]] Data Register ||||Write
|-
|#FBFF||?%xxxxxxxx 11111111||[[TMPI speech synthesizer]] Command/Status Register ||Read||Write
|-
|#FC00 - #FDFFFBFF||%1111110x xxxxxxxx?||[[CPCISA by Yarek|CPCISAACU Real Time Clock (DIY)]] 16bits mode high byte latchZ80-PIO Configure Port B ||Read||Write
|-
|#FCE6FC00 - #FDFF||?%1111110x xxxxxxxx||Port A - [[IDE8255CPCISA|CPCISA]]16bits mode high byte latch||Read||Write
|-
|#FCE7FC00||?||Port C - [[IDE8255M4 Board]]ACK/KICK||Read- ||Write
|-
|#FD00 - #FD3FFC5C||%11111101 00xxxxxx?||[[Programming:SYMBiFACE_IIZ80-SIO dual ports RS232 interface for CPC (French)|SYMBiFACE IIFrench DIY Dual Port RS232]]- Baudrate Selection||Read- ||Write
|-
|#FDE6FC7C||?||Port B - [[IDE8255Z80-SIO dual ports RS232 interface for CPC (French)|French DIY Dual Port RS232]]- Z80-SIO Channel A Data||Read||Write
|-
|#FDE7FC7D||?||RS Port - [[IDE8255Z80-SIO dual ports RS232 interface for CPC (French)|French DIY Dual Port RS232]]- Z80-SIO Channel A Control/Status||Read||Write
|-
|#FE00 - #FFFFFC7E||%1111111x xxxxxxxx?||[[CPCISA by YarekZ80-SIO dual ports RS232 interface for CPC (French)|CPCISAFrench DIY Dual Port RS232]] I/O access (low byte)- Z80-SIO Channel B Data||Read||Write
|-
|#FEE6FC7F||?||Port A - [[IDE8255Z80-SIO dual ports RS232 interface for CPC (French)|French DIY Dual Port RS232]]- Z80-SIO Channel B Control/Status||Read||Write
|-
|#FEE7FCE6||?||Port C A - [[IDE8255]]||Read||Write
|-
|#FEE8FCE7||?||Port C - [[Multiface IIIDE8255]]||?Read||?Write
|-
|#FEEAFD00 - #FD3F||?%11111101 00xxxxxx||[[Multiface Programming:SYMBiFACE_II|SYMBiFACE II]]||?Read||?Write
|-
|#FFXXFD08 - #FD0F||%11111111 xxxxxxxx11111101 00001xxx||[[CPC BoosterX-Mass|X-MASS]] 2.5" 44-pin IDE interface / DOM / CF adapter (XX=#00..#28 are used nowSYMBiFACE II compatible)||Read||Write
|-
|#FF50FD40 - #FD4F||?%11111101 0100xxxx||[[AmdrumProgramming:SYMBiFACE_III|SYMBiFACE III]]||?Read||Write
|-
|#FFE6FD80 - #FD87||?%11111101 10000xxx||Port B CPC-CPLink - FIFO Interface card for Co- [[IDE8255]]processors, incl. Raspberry Pi ||Read||Write
|-
|#FFE7FDE6||?||RS Port B - [[IDE8255]]||Read||Write
|-
|} CPCISA ports for ISA cards{#FDE7|{{Prettytable|width: 700px; font-size: 2em;}}?|''Device''||''PC I/O range''RS Port - [[IDE8255]]||''CPCISA high''Read||''CPCISA low'' Write
|-
|IDE1#FE00||1F0h..1F7h?||#FDF0..#FDF7[[M4 Board]] Data||#FFF0..#FFF7- ||Write
|-
|IDE2#FE00 - #FFFF||170h..177h%1111111x xxxxxxxx||#FD70..#FD77[[CPCISA|CPCISA]] I/O access (low byte)|#FF70..#FF77|Read||Write
|-
|Joystick#FE80 - #FE81||201h..201h%11111110 1000000x||#FC01..#FC01[[Albireo]] CH376 controller||#FE01..#FE01Read||Write
|-
|Ethernet#FE82||210h..21Fh%11111110 10000010||#FC10..#FC1F[[Nova]] RTC & NVRAM||#FE10..#FE1F- ||Write
|-
|Sound Blaster#FE84 - #FEA7||220h..23Fh%11111110 10xxx1xx||#FC20[http://shinra.cpcscene.#FC3Fnet/willy.html Willy] Future use or multi-soundchip ||#FE20..#FE3F-||-
|-
|LPT2#FEAC - #FEAD||278h..27Fh%11111110 101011xx||#FC78[http://shinra.cpcscene.#FC7Fnet/willy.html Willy] S2P Dream SAM2965 MIDI synthetizer ||#FE78..#FE7FRead||Write
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|COM1#FEB0 - #FEB7||2F8h..2FFh%11111110 10110xxx||#FCF8..#FCFF[[Albireo]] serial port||#FEF8..#FEFFRead||Write
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|MIDI'#FEBC - #FEBF||300h..301h%11111110 101111xx||#FD00[http://shinra.cpcscene.#FD01net/willy.html Willy] OPL3 ||#FF00..#FF01-||Write
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|MIDI#FEE6||330h..331h?||#FD30..#FD31Port A - [[IDE8255]]||#FF30..#FF31Read||Write
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|Sound control#FEE7||370h..371h?||#FD70..#FD71Port C - [[IDE8255]]||#FF70..#FF71Read||Write
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|FDC1#FEE8||372h..377h%11111110 1110100x||#FD72..#FD77[[Multiface II]] - Enable Multiface II ROM/RAM||#FF72..#FF77-||Write
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|LPT1#FEEA||378h..37Fh%11111110 1110110x||#FD78..#FD7F[[Multiface II]] - Disable Multiface II ROM/RAM||#FF78..#FF7F-||Write
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|Sound AD#FEF0 -LIB#FEF7||388h..38Bh%11111110 11110xxx||#FD88..#FD8B[[CPC-CompactFlash]] - IDE registers||#FF88..#FF8BRead||Write
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|VGA#FEF0 - #FEF7||3B0h..3BBh%11111110 11110xxx||#FDB0..#FDBB[[uIDE 16]] - IDE registers||#FFB0..#FFBBRead||Write
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|LPT3#FF00 - #FFFF||3BCh..3BFh%11111111 xxxxxxxx||AMSDAP (Amstrad MSx aDAPter, MSX-to-CPC I/O hardware interface (MSX ports #FDBC..00-#FDBFff)||#FFBC..#FFBFRead||Write
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|VGA#FF20 - #FF27||3C0h..3DFh%11111111 00100xxx||#FDC0..#FDCFMP3MSX (MP3 player) via AMSDAP||#FFC0..#FFCFRead||Write
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|FDC1#FF20 - #FF27||3F2h..3F7h%11111111 00100xxx||#FDF2..#FDF7SE-ONE (MP3 player, FM radio receiver, USB master interface) via AMSDAP||#FFF2..#FFF7Read||Write
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|COM1#FF60 - #FF6F||3F8h..3FFh%11111111 0110xxxx||#FDF8..#FDFFCPC [[V9990]] [[PowerGraph]] (upcoming graphic card based on the Graphics 9000 for the MSX)||#FFF8..#FFFFRead||Write
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|} CPCISA ports for ISA motherboard{#FFXX|{{Prettytable|width: 700px; font-size: 2em;}}%11111111 xxxxxxxx|''Device''|[[CPC Booster]] (XX=#00..#28 are used now)|''PC I/O range''|Read|''CPCISA high''||''CPCISA low'' Write
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|DMA#FFXX||000h..00Fh%11111111 xxxxxxxx||#FC00..#FC0F[[Amdrum]] (unsigned 8bit DAC)||#FE00..#FE0F-||Write
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|interrupt#FFE6||020h..03Fh?||#FC20..#FC3FPort B - [[IDE8255]]||#FE20..#FE3FRead||Write
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|counter#FFE7||040h..05Fh?||#FC40..#FC5FRS Port - [[IDE8255]]||#FE40..#FE5FRead||Write
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|keyboard} == Memory Mapped I/O Ports == {|{{Prettytable|060h..067hwidth: 700px; font-size: 2em;}}|'''Mem'''|#FC60..#FC67|'''Decoded as'''|#FE60..#FE67|'''Port'''||'''Read'''||'''Write'''
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|RTC#4000-7FFF||070h..071h%01xxxxxx xxxxxxxx||#FC70..#FC71[[ASIC]] - CPC+/GX4000 registers||#FE70..#FE71Read || Write
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|DMA#C00?||080h..08Fh%11000000 0000000x||#FC80..#FC8F[[Dobbertin Smart Watch]] data read (A0=data)||#FE80..#FE8FRead || -
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|DMA||0C0h..0DFh||#FCC0..#FCDFC00?||#FEC0..#FEDF%11000000 0000000x|-|interrupt[[Dobbertin Smart Watch]] data write (A0=data)||0A0h..0BFhRead ||#FCA0..#FCBF||#FEA0..#FEBF-
|-
|}
== More Ports == Some more I/O addresses (which aren't included in the above list) are here:* [[Schneiderware Summary]]* [[CPCISA]] == 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 Joysticks|Digital Joystick]] and [[Printer Port]] pages. Aside from I/O addresses, there are some other important I/O signals, for example: [[NMI]] or [[External Interrupt|INT]]. [[Category:Programming]] [[Category:Stub]][[Category:CPC Internal Components]][[Category:Hardware]][[Category:Electronic Component]]