I got a file (SSBUG.EXE) which is a SNES debugging environment from a not-specifically known SFX board...SFX boards? Super FX board probably? From the documentation There seem to be 3 versions...any idea?
I have no idea why, but for some reason is the SNES called SFX in the dev docs.. so it most likely isn't for a specific Super FX board but more likely for use with something like the SNES Emulator SE hardware.
You mean mode 20/21? ("LoROM" and "HiROM") This makes sense because those are the two principle types of SNES ROM addressing and account for 99.99% of library. What do you mean by debug cart?
regarding the naming it's not uncommon for japanese companies to use the X letter. SFX is Super Famicom X, just as BS-X is Bandai Satellaview X , and of course, PSX, PlayStation X. Some people suggest that X stands for "experimental/experiment" for the forementioned systems, but I d need more evidence before I believed that.
For some reason, ToToTek refer to their snes flash kit as "for SNEX"... Maybe it's a Japanese thing about nintendo's 16bit machine? I wonder.