Summary

• ALi M1489: Don't clear the SMI status register when SMI enable is cleared but the SMI assert bit is still set, fixes APM on AMI BIOSes
• UMC 8881: SMRAM physical address is always A0000-BFFFF and the relocation registers just set a mapping, fixes hang in SMM on AMI BIOSes
• Give the J-Bond PCI400C-B the correct NVRAM type, fixes the "CACHE MEMORY BAD" error during POST
• Dell OptiPlex GXL/GXM: Correctly clear bit 3 on KBC P1, fixes "Disabled by jumper" message for the BIOS passwords in CMOS setup
• Remove the MACHINE_APM flags from 386/486/Socket 4/Socket 5/Socket 8 machines that shouldn't have it (based on HWINFO and Windows 95 setup testing plus checking for power management options in CMOS setup)

Checklist

• Closes #xxx
• I have tested my changes locally and validated that the functionality works as intended
• I have discussed this with core contributors already
• This pull request requires changes to the ROM set
  • I have opened a roms pull request - https://github.com/86Box/roms/pull/changeme/
• This pull request requires changes to the asset set
  • I have opened an assets pull request - https://github.com/86Box/assets/pull/changeme/

References

Provide links to datasheets or other documentation that helped you implement this pull request.

• Compaq Presario 7000 series technical reference: https://archive.org/details/20240422-121733
• ALi M1489 datasheet: https://bitsavers.org/components/ali/M1487_M1489_486_PCI_Chip_Set_199707.pdf