Understanding 6502 assembly on the Commodore 64 - (21) Optimizing our interrupt code

     In the last chapter, we modified our code to run our binary converter 60 times per second using the system interrupt, bypassing the address of the usual housekeeping code with our own.  We then Jumped back to the housekeeping code so it could proceed.  We didn't cause an interrupt, we just added our code in as part of the normal system interrupt  But In doing so we ran into a bit of a problem.  


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