ISO Loader 0.8.x Beta + preview of DreamShell v4.0 RC 5

[SWAT]

(20.04.2023 11:34)sundance2 писал(а):  Which benefit there is ?

It's not about benefits, but about compatibility.
By default and best case it's use lowest memory address. But some games can use memory after 0x8c004000 or call syscalls without vectors directly from 0x8c001000+ address.
If game uses 0x8c004000 then the loader should placed at 0x8c004800 or high memory with heap. It depends on size used, sometimes just one sector 0x800 = 2048.
If game uses syscalls directly then the loader should placed at 0x8c001100.
From 0x8c000000 to 0x8c004000 - it's just 16KB, only low-level loader can be placed here.

Examples:
- LooneyTunes write one sector at 0x8c004000 so need shift the loader to 0x8c004800, but Extended loader with CDDA can be placed max 0x8c004000. Also this game clear all high memory. So no CDDA for this game yet.
- Quake 3 using syscalls directly, so need shift the loader to 0x8c001100. You can use and 0x8c004000, but the heap placed in high memory in CDDA case and this game clear all high memory.
- Shenmue used 0x8c004000 more than for one sector, so no one regular loader (not low-level) can be placed in low memory, but we can use high memory because game not clear it and have some unused.

So a lot of examples for it. But in general best case is 0x8c000100.