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	CASDAT

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
CASDAT	Audio cassette data	Write data, MIC