What is the difference for xdata types

Hi c51'wizards What is the difference in having a variable as: xdata unsigned char var; versus: unsigned char xdata var; ?????? Does it make sense to have a variable as: xdata...
what type of data should I choose?

Hello I have a program written in assembler for 8051, I need to change it to a program in C for STM32F103. The old program has symbols for individual bytes in memory. e.g in NFL byte: SAVED...
how to find what type of Ram

i am new to computer line. so i would like to know how to find my ram speed,ram brand and what type, without opening my CPU. Please let me how to find the way?
What is the difference for xdata types

Hi c51'wizards What is the difference in having a variable as: xdata unsigned char var; versus: unsigned char xdata var; ?????? Does it make sense to have a variable as: xdata...
what type of data should I choose?

Hello I have a program written in assembler for 8051, I need to change it to a program in C for STM32F103. The old program has symbols for individual bytes in memory. e.g in NFL byte: SAVED...