68008 Dartboard control pcb. By Lee Davison.
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Address range	Device	Notes
$00000 - $0FFFF	U1 EPROM	Primary address
$40000 - $47FFF	U2 RAM	Primary address
$48000 - $4FFFF	U2 RAM	Echoed in this range
$80000 - $8001F	U11 UART	Primary address. Odd byte addresses only
$80020 - $8FFFF	U11 UART	Echoed in this range
$90000 - $9003F	U12 PIT_1	Primary address. Odd byte addresses only
$90040 - $9FFFF	U12 PIT_1	Echoed in this range
$A0000 - $A003F	U29 PIT_2	Primary address. Odd byte addresses only
$A0040 - $AFFFF	U29 PIT_2	Echoed in this range

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