Collaboration diagram for Banked Memory interface for MegaROM.:Modules | |
| Direct access to banked memory by switching page 2. | |
| APIs for direct access to 16KiB segments of banked memory. | |
| Reading and copying from banked memory. | |
| APIs for indirect access to banked memory. | |
| Banked Memory as a storage of Named Resources. | |
#include <resources.h> | |
Files | |
| file | bmem.h |
| Data types and functions for accessing banked memory. | |
Macros | |
| #define | BMEM_H_ |
Detailed Description
#include <bmem.h>
MegaROM is a ROM consisting of up to 256 8KiB or 16KiB segments.
In libmsx, MegaROM is treated as banked memory consisting of one large address space (or a series of 16KiB segments).
The first 16KiB segment is used as the CODE segment.
Subsequent segments are named BANK1, BANK2, ..., and BANK63.
The CODE segment is always placed on page 1 (0x4000..0x7fff) of its slot's address space.
Page 2 (0x8000..0xbfff) is used as a switchable memory bank, and arbitrary 16KiB segment in banked memory can be placed on page 2.
Functions marked __banked in banked memory can be called from CODE segments or other segments, see also SDCC Compiler User Manual "Bank
Switching" and "Z80 banked calls".
bmem.h provides other functions to use banked memory as data storage.
resources.h provides functions to use banked memory as data storage of named resources.
- Note
- These functions are available only when the
CONFIG_ROM_TYPEisascii8orascii16.
