User:Trap15/fm7

Main I/O Map

Address	R/W	Detail
$FD00	R	Keyboard data high bit, and clock speed indicator Bit 7 6 5 4 3 2 1 0 Name D8 CLK D8 Keyboard data bit 8 CLK Clock speed 0: 1.2MHz 1: 2MHz AV always reads '1'
	W	Audio cassette and printer Bit 7 6 5 4 3 2 1 0 Name SLCTIN STRB CASRMT CASWR SLCTIN Printer select input 0: Select 1: Unselect STRB Printer strobe Strobe for data exchange (edge pulse) CASRMT Audio cassette remote 0: ON 1:OFF CASWR Audio cassette data Write data, MIC
$FD01	R	Keyboard data low 8 bits Bit 7 6 5 4 3 2 1 0 Name Keyboard data bits 0~7
	W	Printer output data Bit 7 6 5 4 3 2 1 0 Name Output data
$FD02	R	Audio cassette and printer Bit 7 6 5 4 3 2 1 0 Name CASRD DET2 DTT1 PE ACKNG ERROR BUSY CASRD Cassette data read, SPK DET2 Printer DET 2 (unused) DTT1 Printer DTT 1 (unused) PE Printer Paper Empty 0: Normal 1: No paper ACKNG Acknowledge Triggered by reading (?) ERROR Printer Error 0: Error 1: Normal BUSY Printer Busy 0: Ready 1: Busy
	W	IRQ mask Bit 7 6 5 4 3 2 1 0 Name SYNDET RXRDY TXRDY MFD TIMER PRINTER KEY SYNDET RS-232 sync detect 0: Disable 1: Enable RXRDY RS-232 serial receive ready TXRDY RS-232 serial transmit ready MFD Mini-floppy disk TIMER Periodic timer (every 2.03ms) PRINTER Printer ready for next character KEY Keystroke received
$FD03	R	IRQ flags Bit 7 6 5 4 3 2 1 0 Name EXT TIMER PRINTER KEY EXT Expansion 0: Active 1: Inactive TIMER Periodic timer PRINTER Printer ready for next character KEY Keystroke received
	W	Buzzer Bit 7 6 5 4 3 2 1 0 Name REPEAT SINGLE SPEAKER REPEAT Repeating buzzer 0: Off 1: On SINGLE One-shot buzzer 0: Off 1: On SPEAKER Output buzzer to speaker 0: Mute 1: Output
$FD04	R	Sub-CPU interface, FIRQ flags Bit 7 6 5 4 3 2 1 0 Name FDCMODE KNJMODE 400CARD 400LINE IRQMODE BREAK ATN FDCMODE FDC mode 0: 1MB 1: 320KB L4 only KNJMODE Kanji ROM mode 0: SUB 1: MAIN L4 only 400CARD 400-line card (260k color mode for AV40?) 0: Enable(?) 1: Disable(?) L4 only 400LINE 400-line mode 0: 400-line 1: 200-line L4 only IRQMODE IRQ mode 0: Normal 1: SFD L4 only BREAK Break key pressed 0: Active 1: Inactive ATN Sub-CPU attention signal
	W	Sub-CPU interface Bit 7 6 5 4 3 2 1 0 Name FDCMODE KNJMODE 400CARD 400LINE IRQMODE FDCMODE FDC mode 0: 1MB 1: 320KB L4 only KNJMODE Kanji ROM mode 0: SUB 1: MAIN L4 only 400CARD 400-line card (260k color mode for AV40?) 0: Enable(?) 1: Disable(?) L4 only 400LINE 400-line mode 0: 400-line 1: 200-line L4 only IRQMODE IRQ mode 0: Normal 1: SFD L4 only
$FD05	R	Sub-CPU status, expansion status Bit 7 6 5 4 3 2 1 0 Name BUSY EXTDET BUSY Sub-CPU busy signal 0: Ready 1: Busy EXTDET Expansion card presence 0: Present 1: Not present
	W	Sub-CPU status, expansion status Bit 7 6 5 4 3 2 1 0 Name HALT CANSEL HALT Halt sub-CPU execution 0: Run 1: Halt CANSEL Send IRQ to sub-CPU 0: No 1: Yes
$FD06	RW	RS-232 data Bit 7 6 5 4 3 2 1 0 Name RS-232 data Read to receive, write to transmit.
$FD07	RW	RS-232 command and status (TODO)
$FD08	RW	Light pen (TODO)
$FD09	RW	Light pen (TODO)
$FD0A	RW	Light pen (TODO)
$FD0B	R	Boot switch status, RS-232 interface Bit 7 6 5 4 3 2 1 0 Name CD MODE CD RS-232 Carrier Detect 0: On 1: Off AV20, AV40 only MODE Boot mode switch 0: BASIC 1: DOS AV only
	W	RS-232 interface configuration Bit 7 6 5 4 3 2 1 0 Name CLKSEL BAUD CLKSEL RS-232 clock select TODO AV20, AV40 only BAUD RS-232 baud rate TODO AV20, AV40 only
$FD0C	W	RS-232 interface configuration Bit 7 6 5 4 3 2 1 0 Name DTR ENABLE DTR RS-232 DTR 0: Output 1: Prohibit AV20, AV40 only ENABLE RS-232 enable 0: Disable 1: Enable AV20, AV40 only
$FD0D	W	PSG command register
$FD0E	RW	PSG data register
$FD0F	RW	ROM bank mode Bit 7 6 5 4 3 2 1 0 Name MODE MODE Change ROM bank status by access type Read: ROM Write: RAM
$FD10	W	Initiator ROM disable Bit 7 6 5 4 3 2 1 0 Name INITROM INITROM Initiator ROM enable 0: Enabled 1: Disabled AV only