[spaceg] Space Guerrilla

This forum is for posting M.A.M.E. Work In Progress "Arcade"cheats that are not quite ready for the prime time. If the cheats are buggy or the cheat descriptions are non-standard then please post them here. Help maybe given but there are no guarantees and they will only be added to the cheat file when the cheat file maintainer is happy with them.
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jman
Posts: 850
Joined: Tue Dec 01, 2020 1:24 pm

[spaceg] Space Guerrilla

Post by jman »

Code: Select all

<!-- Space Guerrilla -->
<mamecheat version="1">

    <cheat desc="no hit (test)">
        <comment>causes gfx bug when you fail to destroy bomb/some enemies</comment>
        <script state="on">
            <action>maincpu.mb@1102 = 00</action> <!-- enmey -->
            <action>maincpu.mb@177b = c3</action> <!-- bomb -->
            <action>maincpu.mb@1b51 = c3</action> <!-- bullet -->
        </script>
        <script state="off">
            <action>maincpu.mb@1102 = 24</action>
            <action>maincpu.mb@177b = d2</action>
            <action>maincpu.mb@1b51 = da</action>
        </script>
    </cheat>

    <cheat desc="auto fire">
        <script state="on">
            <action>maincpu.mw@0154 =     3180</action>
            <action>maincpu.md@3180 = 00c9a01a</action>
            <!--
            3180 | 1a : ld  a,(de)
            3181 | a0 : and b
            3182 | c9 : ret
            -->
        </script>
        <script state="off">
            <action>maincpu.mw@0154 =     07e5</action>
            <action>maincpu.md@3180 = 00000000</action>
        </script>
    </cheat>

    <cheat desc="player speed">
        <parameter>
            <item value="0x01">01 (slow)</item>
            <item value="0x02">02       </item>
            <item value="0x04">03       </item>
            <item value="0x06">04       </item>
            <item value="0x08">05 (fast)</item>
        </parameter>
        <script state="on">
            <action>maincpu.mw@053e =             3190</action>
            <action>maincpu.mw@05e2 =             3190</action>
            <action>maincpu.mq@3190 = 10c1093ecdc50006</action>
            <action>maincpu.mq@3198 = 000000000000c9f9</action>
            <!--
            3190 | 06 xx    : ld   b,$xx
            3192 | c5       : push bc
            3193 | cd 3e 09 : call $093E
            3196 | c1       : pop  bc
            3197 | 10 f9    : djnz $3192
            3199 | c9       : ret
            -->
        </script>
        <script state="change">
            <action>maincpu.mb@3191 = param</action>
        </script>
        <script state="off">
            <action>maincpu.mw@053e =             093e</action>
            <action>maincpu.mw@05e2 =             093e</action>
            <action>maincpu.mq@3190 = 0000000000000000</action>
            <action>maincpu.mq@3198 = 0000000000000000</action>
        </script>
    </cheat>

    <cheat desc="bullet speed">
        <parameter>
            <item value="0x01">01 (slow)</item>
            <item value="0x04">02       </item>
            <item value="0x08">03       </item>
            <item value="0x0c">04       </item>
            <item value="0x10">05 (fast)</item>
        </parameter>
        <script state="change">
            <action>maincpu.mb@1802 =      param</action> <!-- speed -->
            <action>maincpu.mb@1e25 = 05 + param</action> <!-- collision range -->
            <action>maincpu.mb@1e28 =  b + param</action> <!-- collision range -->
        </script>
        <script state="off">
            <action>maincpu.mb@1802 = 05</action>
            <action>maincpu.mb@1e25 = 05</action>
            <action>maincpu.mb@1e28 =  b</action>
        </script>
    </cheat>

</mamecheat>
"no hit" has problem. It causes gfx bug when you fail to destroy bomb/some enemies. But "invincibility" in the database based on 0.257 is also the same behavior.
Image
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