RomRaider

Funny you should mention that, there's a Honda thread already somewhere here, and just yesterday someone was asking me about a SH72534 Honda ROM P)

New video (way longer than I hoped, oops) - Looking at 2D table interpolators, finding axis lookup values etc.
https://youtu.be/kZx8fIMpCps

Definitely some nice verification for what I originally suspected. The axis interpolation functions are really interesting to look at. They don’t necessarily guarantee identical scaling, but it should be at least based off byte size. But I think I recall seeing that they still are pretty close with their scaling. In the sense that their base value (like 128 for %’s) will be similar, even if the actual scaling is different. For example, one of the shared axis functions was used for a 8bit % value, as well as an 8bit AFR value. Since both default to 128 (14.7 AFR and 100%).

Not sure on if that’s universal or if that was just used in that particular function, but still something to keep in mind. For CF48D (SH7058), it’s always been R4- Map, R5- Y-axis, and R6- X-Axis, for however many of the 2,300+ “maps” were actual 3D maps.

Another thing to keep in mind is signed vs unsigned. Everything should be assumed to be signed (as that’s the default it seems) unless proven otherwise. It’s extremely easy to verify by just looking and seeing if it uses extu or exts or something similar for unsigned vs signed. Most things are unsigned, so it’s interesting how the default is signed. Default, as in, the mov instructions.

New vid, #3: HEW simulation

https://youtu.be/GX8qcApZ0Pg

Nice video.
Similarly you can use Simulator for SH (simsh) from Lauterbach and setup config files to load RAM with data along with the CPU bin file.

Cool, I knew about Lauterbach but had no idea they also had (free) simulators for all those. Thanks!