Program data for the 8051 microcontroller can be in different memory blocks ... The following are a few tips for reducing the size of executable code of C programs. The examples used the Keil v6.20 ...

[Andrew] picked up a handful of these big STC 8051 chips for a song and dance. The problem he has with them is the clunky VB6 programming software ... the Small Device C Compiler (SDCC).