Routines
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37980: Test Action Key
Return non-zero when FULL-STOP or Z (action) is held.
Output
A Zero if the action key is not pressed
TestActionKey 37980 LD A,126 Read from the keyboard;
Port Number Bit
0 1 2 3 4
126 SPACE FULL-STOP M N B
Shift Z X C V
37982 OUT (253),A
37984 IN A,(254)
37986 CPL Flip the bits.
37987 AND %00000010 Keep only bit 1.
37989 RET Return.
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