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I had a lot of fun doing what you're doing back in the 70s for TRS-80 programs in Z80 assembler. Learned a lot of things about shoehorning code into an eprom that way.
When you get to the point where you want to burn a new chip, google "eprom emulators" to get some more fungible hardware. What you really want for what you are doing is an in-circuit 8051 emulator, but they are not exactly cheap.
-CTH
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