Routines
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EE9A: Choose Random Velocity
Used by the routine at Handle_Gargoyle.
Returns either 20 or E0 (that is, 20 or minus 20), which depends on bit 6 of the low byte of FRAMES.
Output
A 20 if bit 6 of FRAMES is set, otherwise E0
Choose_Random_Velocity EE9A LD A,($5C78) Fetch the low byte of FRAMES.
EE9D AND %01000000 Keep only bit 6.
EE9F OR %00100000 Set bit 5.
EEA1 SUB $40 Subtract 40 which gives 20 if bit 6 was set and E0 if it was not.
EEA3 RET Return.
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