Keyboard

Number	$**FE
Decimal
Short desc.	Series of specific ports that read keyboard key presses.
Bit Mask	%xxxx xxxx ---- ---0 where only one bit in x is 0
Readable	Yes
Writable	No
Subsystem	Input

Reads keys on the keyboard depending on the upper byte of the port number. The five keys are represented by bits 0-4 of the read byte, listed below with bit 4 first down to bit 0. A zero means that the key is pressed.

Port upper byte	Keys affected
$7F	B, N, M, Symbol Shift, Space
$BF	H, K, J, L, Enter
$DF	Y, U, I, O P
$EF	6, 7, 8, 9, 0
$F7	5, 4, 3, 2, 1
$FB	T, R, E, W, Q
$FD	G, F, D, S, A
$FE	V, C, X, Z, Caps Shift