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You may install the wrong software, keil uv4 is actually there are two, one is called MDK, is for arm, I am now used to write stm32f103ve, the other is called c51, is 51 MCU, you s...

Why doesn't KEILuVision4 have C51?

You may install the wrong software, keil uv4 is actually there are two, one is called MDK, is for arm, I am now used to write stm32f103ve, the other is called c51, is 51 MCU, you should install keil uv4 c51, hope to help you.