Changes
/* Memory Mapped I/O */
This list shows only the internal standard I/O ports, as used in the BIOS ROM of the CPC 464/664/6128 BIOS, and in the AMSDOS ROM of the CPC 664/6128 and DDI-1. For a more complete list, including all Peripherals, see the [[I/O Port Summary|Complete I/O Port Summary]].
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|#7FXX||%01xxxxxx xxxxxxxx||[[Gate Array]]||-||Write
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|#7FXX||%0xxxxxxx xxxxxxxx||[[PAL16L8|PAL ]] extension to [[Gate Array]] for 128K RAM banking||-||Write
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|#BCXX||%x0xxxx00 xxxxxxxx||6845 [[CRTC]] Index|| - ||Write
|#EFXX||%xxx0xxxx xxxxxxxx||[[Printer Port]]|| - ||Write
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|#F4XX||%xxxx0x00 xxxxxxxx||[[8255]] PIO PPI Port A ([[PSG]] Data)||Read||Write
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|#F5XX||%xxxx0x01 xxxxxxxx||[[8255]] PIO PPI Port B (Vsync,[[Printer Port|PrnBusy]],Tape,etc.)||Read|| -
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|#F6XX||%xxxx0x10 xxxxxxxx||[[8255]] PIO PPI Port C (KeybRow,Tape,[[PSG]] Control)|| - ||Write
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|#F7XX||%xxxx0x11 xxxxxxxx||[[8255]] PIO PPI Control-Register|| - ||Write
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|#F8FF||N/A||[[Peripheral Soft Reset]] (MC_BOOT_PROGRAM and MC_START_PROGRAM do OUT [F8FF],FF)|| - ||Write
|#FA7E||%xxxxx0x0 0xxxxxxx||Floppy Motor Control (for [[765 FDC]])|| - ||Write
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|#FADC||?%xxxxx0x0 xx0xxx00||[[Amstrad Serial Interface]] Z80-SIO / DART port A Data Register||Read||Write
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|#FADD||?%xxxxx0x0 xx0xxx01||[[Amstrad Serial Interface]] Z80-SIO / DART port A Control Reg.||Read||Write
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|#FADE||?%xxxxx0x0 xx0xxx10||[[Amstrad Serial Interface]] Z80-SIO / DART port B Data Register||Read||Write
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|#FADF||?%xxxxx0x0 xx0xxx11||[[Amstrad Serial Interface]] Z80-SIO / DART port B Control Reg.||Read||Write
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|#FB7E||%xxxxx0x1 0xxxxxx0||[[765 FDC]] (internal) Status Register||Read|| -
|#FB7F||%xxxxx0x1 0xxxxxx1||[[765 FDC]] (internal) Data Register||Read||Write
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|#FBDC||?%xxxxx0x1 xx0xxx00||[[Amstrad Serial Interface]] 8253 Timer counter 0||Read||Write
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|#FBDD||?%xxxxx0x1 xx0xxx01||[[Amstrad Serial Interface]] 8253 Timer counter 1||Read||Write
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|#FBDE||?%xxxxx0x1 xx0xxx10||[[Amstrad Serial Interface]] 8253 Timer counter 2||Read||Write
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|#FBDF||?%xxxxx0x1 xx0xxx11||[[Amstrad Serial Interface]] 8253 Timer Modus Select|| - ||Write
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* The FDC is considered as an expansion peripheral. The three [[765 FDC]] floppy ports are contained in CPC 664/6128/Plus and DDI-1 only.
* The eight [[Amstrad Serial Interface]] ports are pre-defined as shown above in the AMSDOS ROM. However, neither the CPC 664/6128/Plus nor DDI-1 do actually contain the corresponding RS232 hardware.
<br> == Memory Mapped I/O == {| class="wikitable"!Mem!Decoded as!Port!Read!Write|-|#4000-7FFF||%01xxxxxx xxxxxxxx||ASIC - CPC+/GX4000 registers|| Read || Write|-|} Writes to unused areas of the ASIC I/O page are not persisted. [[Categoryhttps:Programming//www.cpcwiki.eu/forum/games/harrier-attack-reloaded/msg247703/#msg247703 Source] See the [[ASIC]] page for details. <br> [[Category:StubProgramming]][[Category:Built in HardwareCPC Internal Components]]
