Routines
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E4E0: wait ~8.5 seconds for any key from the STOP key column
Used by the routine at F72C.
E4E0 69 02 ADC #$02 set the number of jiffies to wait
E4E2 A4 91 LDY $91 read the stop key column
E4E4 C8 INY test for $FF, no keys pressed
E4E5 D0 04 BNE $E4EB if any keys were pressed just exit
E4E7 C5 A1 CMP $A1 compare the wait time with the jiffy clock mid byte
E4E9 D0 F7 BNE $E4E2 if not there yet go wait some more
E4EB 60 RTS
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