Difference between revisions of "Build tool/InstallRAMISR"
From MSX Game Library
(Created page with "Build tool option '''InstallRAMISR''' is used to automatically select RAM in page 0 then copy data there at startup, so ROM cartridge can take advantage of 16 KB of additi...") |
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InstallRAMISR can take 3 values: | InstallRAMISR can take 3 values: | ||
| − | * <tt>RAM0_NONE</tt>: Don't | + | * <tt>RAM0_NONE</tt>: Don't switch page 0 to RAM |
| − | * <tt>RAM0_ISR</tt>: | + | * <tt>RAM0_ISR</tt>: Switch page 0 to RAM then install ISR at 0x0038 (mandatory address) |
| − | * <tt>RAM0_SEGMENT</tt>: | + | * <tt>RAM0_SEGMENT</tt>: Switch page 0 to RAM, install ISR at 0x0038 , then copy segment data (for mapped-ROM) |
Revision as of 01:10, 3 December 2024
Build tool option InstallRAMISR is used to automatically select RAM in page 0 then copy data there at startup, so ROM cartridge can take advantage of 16 KB of additional RAM.
As page 0 (addresses 0x0000-0x3FFF) is the place where MSX will search for interruption handler (ISR), the build tool will automatically copy the selected ISR (see CustomISR option).
InstallRAMISR can take 3 values:
- RAM0_NONE: Don't switch page 0 to RAM
- RAM0_ISR: Switch page 0 to RAM then install ISR at 0x0038 (mandatory address)
- RAM0_SEGMENT: Switch page 0 to RAM, install ISR at 0x0038 , then copy segment data (for mapped-ROM)