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- [Main]
- Title=_extraram
- See Also=symbols_extra_ram_addr: Extra RAM Addresses
- [Top]
- Usually, this symbol is not handled in a special way. However, if it does
- not exist at all, it is redirected to the entry point of the program. The
- effect is that constructs of the form
- <PRE>.word _extraram-<I>entry_point</I>
- </PRE>
- resolve to 0 if the symbol is undefined.
- <BR><BR>
- The kernel headers of the standard library reference this symbol as an extra
- RAM table. The table is organized in pairs of 16 bit values. Of each pair,
- the first value is relevant for the TI-89, and the second value is relevant
- for the TI-92(+)/V200 calculator family. In C, you would define an extra RAM
- table like this:
- <PRE>struct {
- short value89, value9x;
- } _extraram[] = {{v1_89, v1_9x}, {v2_89, v2_9x}, ...};
- </PRE>
- However, extra RAM tables are barely usable in C: The compiler does not
- support using external symbols as immediate values, except if you take their
- address.
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