When you look at typical FGPA emulator source code, it often looks pretty close to software emulator code ported to VHDL/Verilog instead of an attempt to re-create the original reverse-engineered 'transistor-level design' which would automatically reproduce any 'undocumented behaviour' of the original chip (like http://www.visual6502.org/JSSim/index.html)
As such, an FGPA emulator isn't necessarily any closer to the original hardware behaviour than a software emulator. I guess the main advantage of FGPA is better performance on lower cost hardware.
As such, an FGPA emulator isn't necessarily any closer to the original hardware behaviour than a software emulator. I guess the main advantage of FGPA is better performance on lower cost hardware.