SA-1 Speed Test v5.1 shows some major differences

[birdybro]

The SNES SA-1 Speed Test v5.1 rom from @VitorVilela7 shows some interesting results. This is all tested with the 20220909 release build. These are minor observations, I am not sure if they actually impact gameplay that much at all, but figured it was worth it to document and put here in case it's useful.

MiSTer Results:

Compare these results to the real hardware tests from QcRetro:

https://github.com/VitorVilela7/SnesSpeedTest/tree/master/img/hardware#1l8b-10-v51

Most results are going quite a bit faster than the original hardware (there may be some hardware variation to account for some of this). The ones that stand out are:

• Page 3/4 - WRAM - ROM (JMP) is 3 MHz faster on MiSTer.
• Page 3/4 - ROM - ROM (JMP) is 1.34MHz faster on MiSTer.
• Page 3/4 - WRAM - ROM (JML) is 1.8MHz faster on MiSTer.
• Page 3/4 - ROM - ROM (RTL) is 1.5MHz slower on MiSTer.
• Page 3/4 - ROM - ROM (RTI) is 2.7MHz faster on MiSTer.
• Page 4/4 ROM - I --> BW-RAM P - Core Speed is 9.2MHz slower on MiSTer. (huge difference for some reason, 0.14MHz instead of 10.34MHz)
• Page 4/4 ROM - BW --> I-RAM P - Core Speed is 9.26MHz slower on MiSTer. (another huge difference, 0.14MHz instead of 10.40MHz)

I'm not sure if any gameplay is affected by these, just reporting them as @wwark brought it to my attention. There are some other minor differences, but I chose not to include ones that were less than 1MHz difference in the results, since it's possible hardware variance could account for this.