LHO 22 C and the The Silicon Labs ISE uses the Keil C51 compiler. The code size is limiter to 2K C has replaced PL/M (the original Intel high. - ppt download
Der Keil C51-Compiler | elmicro.com
Keil C51 Compiler Free Download – OsFreeware
Keil C51 doesn't allocate memory for struct pointers at compile time - Stack Overflow