Hi,
No, Contra is that side-scroller shooting game for Nintendo
Entertainment System. It had a DOS port.
Best regards,
Michał
W dniu 04.03.2021 o 23:37, Louis Santillan pisze:
I think those are binary instructions. Not actual addresses. You
could try disassembling here [0] but a quick cut & paste gave an
instruction sequence that is non-obvious to me. If Contra is a
debugger/mod, then that makes a little more sense. The full message
might also help clear things up. Also, noting what memory managers,
drivers, and other software versions are running also helps.
[0] https://defuse.ca/online-x86-assembler.htm#disassembly2
<https://defuse.ca/online-x86-assembler.htm#disassembly2>
On Thu, Mar 4, 2021 at 12:37 PM Michał Dec <[email protected]
<mailto:[email protected]>> wrote:
Hello,
I've run some software on Pentium 3 Tualatin S on FreeDOS and it's
getting an invalid opcode error. The error precisely says "Invalid
opcode at ..." where ... is a bunch of 16 bit variables. Saying
"at" is
really misleading and doesn't make any sense, since such a high
address
like let's say 628a 0000 3002 206f 2b43 202b 202d 6f43 7970 6972 6867
2074 3931 is well within the realm of ZFS storage, not protected mode
address space :D
If anyone's wondering, the offending software is Contra and Quake
1.08
(software renderer). For what it's worth, the above hex string is
exactly what Quake blurted out.
Where do I even begin with understanding this message? Is this a
series
of opcodes the CPU failed to run, or is this an address, or is it
something else? I could recompile Quake, but Contra will probably
require me to patch the binary with the help of reverse
engineering tools.
Best regards,
Michał
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