1942b hit anywhere

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einstein95
Posts: 17
Joined: Sun Aug 16, 2015 1:15 pm

1942b hit anywhere

Post by einstein95 »

In 1942.xml, there's a hit anywhere code. I took a shot at porting it, but it fails (with quite amusing results)

Code: Select all

  <cheat desc="Hit Anywhere">
    <script state="on">
      <action>temp0 =maincpu.mb@3489</action> <!-- / -->
      <action>temp1 =maincpu.mb@34B4</action> <!-- / -->
      <action>temp2 =maincpu.mb@34EE</action> <!-- ? *DA* 3E 34 CD -->
      <action>temp3 =maincpu.mb@34FE</action> <!-- / -->
      <action>temp4 =maincpu.mb@3537</action> <!-- ? *DA* 3E 34 DD -->
      <action>temp5 =maincpu.mb@356F</action> <!-- ? *C6* CD 76 36 -->
      <action>temp6 =maincpu.mb@358B</action> <!-- ? *D6* 21 63 38 -->
    </script>
    <script state="run">
      <action>maincpu.mb@3489=00</action> <!-- This ROM cheat was made by nolberto82 -->
      <action>maincpu.mb@34B4=86</action>
      <action>maincpu.mb@34EE=3A</action>
      <action>maincpu.mb@34FE=86</action>
      <action>maincpu.mb@3537=3A</action>
      <action>maincpu.mb@356F=86</action>
      <action>maincpu.mb@358B=C6</action>
    </script>
    <script state="off">
      <action>maincpu.mb@3489=temp0 </action>
      <action>maincpu.mb@34B4=temp1 </action>
      <action>maincpu.mb@34EE=temp2 </action>
      <action>maincpu.mb@34FE=temp3 </action>
      <action>maincpu.mb@3537=temp4 </action>
      <action>maincpu.mb@356F=temp5 </action>
      <action>maincpu.mb@358B=temp6 </action>
    </script>
  </cheat>
The 3rd, 5th, 6th and 7th addresses are guesses based on the relative bytes, but they're quite obviously incorrect. I've left my meagre notes in the comments next to the addresses.
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Pugsy
Posts: 3638
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Re: 1942b hit anywhere

Post by Pugsy »

It's a pain in the arse to port ROM codes, if it's not a simple offset change you need to search for every address but ideally you shouldn't use any bytes in the search string which are relative to memory or direct jumps..

So for 1942b or the other clones to be sure you will need to do this in the debugger (during play generally to avoid any banking issues, doesn't matter for 1942 as the code is not banked but it's a useful tip):-

Addresses in order in cheat:-
f 0,ffff,b8,dd,34
f 0,ffff,c6,dd <--1st of 3
f 0,ffff,c6,dd <--2nd of 3 (take 9 off address, should be DA in location)
f 0,ffff,c6,dd <--2nd of 3
f 0,ffff,dd,0x34,0a <- 4th of 5 take 3 off address, should be DA in location
f 0,ffff,c6,cd <-- 1st of two
f 0,ffff,d6,21 <- 2nd of 4

It turns out that the 1942b addresses are just +4 offset of 1942

These cheats will work for all the other clones apart from 1942w which is just a +2 offset of 1942.

Code: Select all

  <cheat desc="Hit Anywhere">
    <script state="on">
      <action>temp0 =maincpu.mb@3489</action>
      <action>temp1 =maincpu.mb@34B4</action>
      <action>temp2 =maincpu.mb@34F5</action>
      <action>temp3 =maincpu.mb@34FE</action>
      <action>temp4 =maincpu.mb@3538</action>
      <action>temp5 =maincpu.mb@3570</action>
      <action>temp6 =maincpu.mb@358C</action>
    </script>
    <script state="run">
      <action>maincpu.mb@3489=00</action> <!-- This ROM cheat was made by nolberto82 -->
      <action>maincpu.mb@34B4=86</action>
      <action>maincpu.mb@34F5=3A</action>
      <action>maincpu.mb@34FE=86</action>
      <action>maincpu.mb@3538=3A</action>
      <action>maincpu.mb@3570=86</action>
      <action>maincpu.mb@358C=C6</action>
    </script>
    <script state="off">
      <action>maincpu.mb@3489=temp0 </action>
      <action>maincpu.mb@34B4=temp1 </action>
      <action>maincpu.mb@34F5=temp2 </action>
      <action>maincpu.mb@34FE=temp3 </action>
      <action>maincpu.mb@3538=temp4 </action>
      <action>maincpu.mb@3570=temp5 </action>
      <action>maincpu.mb@358C=temp6 </action>
    </script>
  </cheat>
Pugsy

Servicing your cheating needs since 1985 8)

Grab the latest cheat collection:
MAME 0.259 XML cheat collection (6 OCTOBER 2023) from http://www.mamecheat.co.uk or direct from:-
https://mega.nz/file/q4dHGZ6K#i-EUiqIjH ... KMz7hnbTfw (ZIP Archive 3.76MB)
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