Autoscroll scale value from SuperDAT does not match header output from OG build tool

[patters-match]

All other SuperDAT values are preserved in the emulator's ROM header, but the scale value is transformed by SNESAdvance.exe. This is not described in technotes.txt. For instance:

Game	SuperDAT hex	SuperDAT dec	output hex	output dec	scaling factor
Super Mario World	0x0A	10	0x19	25	x 2.50
Chrono Trigger	0x05	5	0x0C	12	x 2.40
Gradius III	0x32	50	0x80	128	x 2.56
Castlevania - Dracula X	0x1E	30	0x4C	76	x 2.53
Secret of Mana	0x64	100	0x100	256	x 2.56
Super Metroid	0x32	50	0x80	128	x 2.56

My script follows the spec and writes the value from the SuperDAT, but I can see that the behaviour of the official builder gives more optimal display results. These bytes are the only divergence between my script and the original Win32 builder.

[patters-match]

Ok. As the numbers grow larger the scaling factor trends towards 2.56 which resembles a power of 2, not 2.5. The easiest way to get x2.56 without floating point numbers is to multiply by 256 (0x100) and then divide by 100 (0x64). This yields precisely the observed results.

scale = int((scale * 0x100) / 0x64)