The compiler handled the saving and restoring of registers (context switching) automatically.
The compiler provides several specialized extensions to the standard C language to handle the unique Harvard architecture of the 8051 (url: https://en.wikipedia.org/wiki/Intel_MCS-51): hi-tech c51
Supports small , compact , and large memory models to optimize how variables are stored across the 8051's internal RAM, external RAM (XDATA), and code space. The compiler handled the saving and restoring of
Even on modern systems, developers still use it for prototyping and learning due to its low-friction setup for 8-bit MCU firmware. Option 3: The "Comparison" Post Best for: Deciding between legacy and modern tools. HI-TECH C51-lite Download external RAM (XDATA)