Emulator Cheats

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<!-- 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>