(C) Kirill Frolov
__________________________________________
Hello All.
I do know of 3 methods to distinguish the real hardware of
emulators - check the operation command ld a, i or ld a, r for
interrupt enable, inspection time performance of individual
teams and performance as a whole-time checking of individual
teams in 1818VG93, well, for the most buggy
ancient and emulators you can try to check the correctness of
emulation register R and Register F. Try to use the
undocumented commands useless.
Many emulators exactly
there are problems with the speed of their work relative to the
rate of interruptions and all existing with the correct
emulation commands ld a, i and ld a, r (at a time when it comes
to interruption). With VGshkoy have other problems
- Not all computers have the opportunity to
easily and quickly produce the main reading
its registers.
But to provide a simple check is small,
because bad emulyatorschiki can take
debugger and fix it. Requires decoding of the program code with
all the differences emulators from Spectrum. But this enough -
a computer that is running the emulator, very often works many
times faster than the Spectrum, and hence emulyatorschik
can write a program to correct
decryption code. To provide more
protection from the emulator to be duplicated many times all
the checks in all parts of the program, then if emulyatorschik
want to run this program, he to be a lot of manual work.
Now bad emulyatorschiki can write what I zaglyuchil and
accuse me of that I, too, emulyatorschik. But I do
I know that I did not come up with protection from the
emulator, then it is of interest not only me. I know that there
is a computer magazine for Spectrum, which used a range of
protective equipment on the emulator. But I I do not know what
it is called and I have it, certainly not :-(
A what is it I ... It is high time to systematize all
knowledge relating to the protection of bad emulator, and apply
this same protection, wherever possible, and
primarily for new programs.
