Summary

1. In the STG code, separated the STG1703 without its built-in clock as 1702 while keeping the one with the clock as 1703.
2. Added the ICS2494AN-324 clock generator used by the et4000w32 series.
3. Return 0x98 as the ID of the ATT498 ramdac.
4. Corrected the pixel clocks of the IBM RGB528 while keeping its current compatibility and exactness of the refresh rates of its clocks.
5. Added a variable reference clock of the SDAC/GenDAC for future use.
6. The clocks of the TVP3026 have been implemented for a while. Some corrections have been made (plus color key r/w).
7. Mach64 enhanced mode doesn't use scrollcache (bits 0-3 of attrregs 0x13), fixes some pixels being off (mainly in win3.1x)
8. Reorganized the cirrus 54xx built-in clock for proper refresh rates.
9. Proper reorganization of the et4000w32 series of chipsets and their cards supporting them, from cursor to clocks to ramdacs plus a 24bpp acceleration fix for the w32p series (about pixels being processed in bitblt).
10. Removed the PCI videomagic card as its bios doesn't have the PCIR header while making sure the plain ISA/VLB w32 and ISA only w32i (now named Axis Microdevice) support 2mb of vram properly.
11. Added the Hercules Dynamite VL Pro based on the w32i chip (and VLB).
12. Initialize the et4000w32 cards with misc bit 0 set as well as crtc31 bit 6 for rs2 connection to the ramdac.
13. Refactored the S3 Pre-ViRGE code to have proper refresh rates and clocks and added the 805I as a member of the chips (ID 0xa8).
14. Replaced the S3 805I Elsa Winner 1000 ISA bios with a more supported one for our code using the SDAC.
15. Added proper 24bpp acceleration to the Visionx68 chips.
16. Fixed wrong colors in the 911/924 15/16bpp acceleration when used for the first time.
17. Match the ViRGE mapping to the pre-ViRGE one per manual/datasheet.
18. Correct as best as possible the TGUI9400 clocks.

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 - Added a revision of the Elsa Winner 1000 ISA 805i BIOS roms#414

References

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