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8051 only has 64K program memory because it has 16-bit address bus. However, you can use I/O Port bits (P1.x, P3.x) to generate address bits. Then, program memory will include many pages, each of them has 64K.
Ex: use P1.0, P1.1 as A16 and A17, you can generate 64Kx4 = 256K memory space.
I agree with petarpav, Keil support it.
You are right with the extra pins ...
But can be this applied for the program memory?
How the 8051 would know to control the extra pins to acess the extra PROGRAM memory (not RAM or data memory!)?
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