QSINIT (including the RAMDISK that uses memory above 4 GB) is at:
ftp://212.12.30.18/public/QS/Note that you do need to use the QSINIT loader, to be able to use the RAMDISK.
QSINIT has NOTHING to do with OS/4 (which includes acpi4). They are separate projects. At the moment, I have no interest in OS/4, but I am pretty sure that the URL was posted in one of these threads.
Be aware, that there is some concern about the legality of OS/4. Whether that is justified, or not, I don't know. QSINIT is a completely new work, NOT based on previous work, although it does share a few similarities, and some history, with the OS/4 loader.
Hopefully, the URL is correct now...