Earlier I did not have access to the site (Not found!) but now it works. Thanks, I'll see later if there's anything interesting...
Some info here, there are 3 pages (links at the top of the page)
http://www.ucatv.ne.jp/~kmizuo/ryori/msx2.html
In fact, the site is not accessible by https. Anyway, there is no explanation that allows us to read a file on SRAM.
These are just some descriptions of where data is located in RAM (number of lives, etc.) and a summary of how to use the DOSBOOT.COM, SHIN-10.COM and DOSBOOT.COM utilities. The first two commands are the equivalent of ESE-10.COM but less evolved.
Game Master 2 would really be 10 times more fun if we could add SRAM support to our programs. Konami didn't have a grand vision for his cartridge. Its use is even only confined to cartridge games, but it would still be interesting to be able to access this function.
PS: I finished and submitted the ESE-10 translation to downloads.
Game Master 2 SRAM saving/loading utilities by Sean Young below handles the SRAM files and the source code is even available but, them not work with Game Master 2 for ESE-RAMs (ESE-10.COM).
http://bifi.msxnet.org/msxnet/konami/gamemasters/gm2sram.zip
Konami didn't have a grand vision for his cartridge. Its use is even only confined to cartridge games, but it would still be interesting to be able to access this function.
I'm wrong because the Game Master 2 boot can be bypassed by pressing [Graph] or [Space] key during the MSX starting. :)