$7b93 nop
$7b94 ld a, $10
$7b96 out ($fe), a
$7b98 in a, ($fe) ; A=$10 to read all keys except 67890
$7b93 ld a, $10
$7b95 out ($fe), a
$7b97 cpl
$7b98 in a, ($fe) ; A=$ef to read only keys 67890
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