Emulator Cheats

Posted: **Wed Jan 04, 2023 10:55 am**

andromed will work in 0.252.

<cheat desc="no hit">
    <script state="on">
        <action>maincpu.mw@1e85 = 0bd0</action> <!-- bullet -->
        <action>maincpu.mw@29cd = 0b90</action> <!-- enemy -->
    </script>
    <script state="off">
        <action>maincpu.mw@1e85 = 6cf6</action>
        <action>maincpu.mw@29cd = 7be6</action>
    </script>
</cheat>

<cheat desc="auto fire">
    <script state="on">
        <action>maincpu.mb@1fc2 = 01</action>
    </script>
    <script state="off">
        <action>maincpu.mb@1fc2 = 03</action>
    </script>
</cheat>

<cheat desc="bullet speed">
    <parameter min="0x01" max="0x05" step="0x01" />
    <script state="on">
        <action>maincpu.mb@272a =               2f</action>
        <action>maincpu.mb@274a =               e8</action>
        <action>maincpu.mq@2fe9 = a8682b00204800a9</action>
        <action>maincpu.mq@2ff1 = f2d0988804f07aa5</action>
        <action>maincpu.mq@2ff9 = 0000000000000060</action>
        <!--
        2fe9 | a9 xx    : lda #$xx
        2feb | 48       : pha
        2fec | 20 00 2b : jsr $2b00
        2fef | 68       : pla
        2ff0 | a8       : tay
        2ff1 | a5 7a    : lda $7a
        2ff3 | f0 04    : beq $2ff9
        2ff5 | 88       : dey
        2ff6 | 98       : tya
        2ff7 | d0 f2    : bne $2feb
        2ff9 | 60       : rts
        -->
    </script>
    <script state="change">
        <action>maincpu.mb@2fea = param</action>
    </script>
    <script state="off">
        <action>maincpu.mb@272a =               2a</action>
        <action>maincpu.mb@274a =               ff</action>
        <action>maincpu.mq@2fe9 = 0000000000000000</action>
        <action>maincpu.mq@2ff1 = 0000000000000000</action>
        <action>maincpu.mq@2ff9 = 0000000000000000</action>
    </script>
</cheat>

Posted: **Wed Jan 11, 2023 10:17 am**

I add "player speed" and "bullet speed" codes. These use memory region : $3000 - $3fff installed by lua plug-in. (Default is "unmapped" area).
Check "http://www.mamecheat.co.uk/forums/viewtopic.php?f=10&t=12237&start=114".

Code: Select all

<cheat desc="player speed">
    <parameter min="0x01" max="0x05" step="0x01" />
    <script state="on">
        <action>maincpu.mb@272d =               2f</action>
        <action>maincpu.mb@274d =               ff</action>
        <action>maincpu.pq@3000 = a868206f204800a9</action>
        <action>maincpu.pq@3008 = 00000060f6d09888</action>
        <!--
        3000 | a9 xx    : lda #$xx
        3002 | 48       : pha
        3003 | 20 6f 20 : jsr $206f
        3006 | 68       : pla
        3007 | a8       : tay
        3008 | 88       : dey
        3009 | 98       : tya
        300a | d0 f6    : bne $3002
        300c | 60       : rts
        -->
    </script>
    <script state="change">
        <action>maincpu.pb@3001 = param</action>
    </script>
    <script state="off">
        <action>maincpu.mb@272d =               20</action>
        <action>maincpu.mb@274d =               6e</action>
        <action>maincpu.pq@3000 = 0000000000000000</action>
        <action>maincpu.pq@3008 = 0000000000000000</action>
    </script>
</cheat>
<cheat desc="bullet speed">
    <parameter min="0x01" max="0x05" step="0x01" />
    <script state="on">
        <action>maincpu.mb@272a =               30</action>
        <action>maincpu.mb@274a =               0f</action>
        <action>maincpu.pq@3010 = a8682b00204800a9</action>
        <action>maincpu.pq@3018 = f2d0988804f07aa5</action>
        <action>maincpu.pq@3020 = 0000000000000060</action>
        <!--
        3010 | a9 xx    : lda #$xx
        3012 | 48       : pha
        3013 | 20 00 2b : jsr $2b00
        3016 | 68       : pla
        3017 | a8       : tay
        3018 | a5 7a    : lda $7a
        301a | f0 04    : beq $3020
        301c | 88       : dey
        301d | 98       : tya
        301e | d0 f2    : bne $3012
        3020 | 60       : rts
        -->
    </script>
    <script state="change">
        <action>maincpu.pb@3011 = param</action>
    </script>
    <script state="off">
        <action>maincpu.mb@272a =               2a</action>
        <action>maincpu.mb@274a =               ff</action>
        <action>maincpu.pq@3010 = 0000000000000000</action>
        <action>maincpu.pq@3018 = 0000000000000000</action>
        <action>maincpu.pq@3020 = 0000000000000000</action>
    </script>
</cheat>

Posted: **Mon May 26, 2025 9:39 am**

andromed.xml

Code: Select all

<!-- Andromeda SS (Japan?) -->
<mamecheat version="1">

    <cheat desc="no hit">
        <script state="on">
            <action>maincpu.mw@1E85 = 0BD0</action> <!-- bullet -->
            <action>maincpu.mw@29CD = 0B90</action> <!-- enemy -->
        </script>
        <script state="off">
            <action>maincpu.mw@1E85 = 6CF6</action>
            <action>maincpu.mw@29CD = 7BE6</action>
        </script>
    </cheat>

    <cheat desc="rapid fire">
        <script state="on">
            <action>maincpu.mb@1FC2 = 01</action>
        </script>
        <script state="off">
            <action>maincpu.mb@1FC2 = 03</action>
        </script>
    </cheat>

    <cheat desc="player speed">
        <parameter min="0x01" max="0x05" step="0x01" />
        <script state="on">
            <action>maincpu.mb@272D = 02</action>
            <action>maincpu.mb@274D = CF</action>
        </script>
        <script state="run">
            <action>maincpu.pq@02D0 = A868206F204800A9</action>
            <action>maincpu.pq@02D8 = 00000060F6D09888</action>
            <!--
            02D0 | A9 xx    : lda #$xx
            02D2 | 48       : pha
            02D3 | 20 6F 20 : jsr $206f
            02D6 | 68       : pla
            02D7 | A8       : tay
            02D8 | 88       : dey
            02D9 | 98       : tya
            02DA | D0 F6    : bne $02d2
            02DC | 60       : rts
            -->
            <action>maincpu.pb@02D1 = param</action>
        </script>
        <script state="off">
            <action>maincpu.mb@272D = 20              </action>
            <action>maincpu.mb@274D = 6E              </action>
            <action>maincpu.pq@02D0 = 0000000000000000</action>
            <action>maincpu.pq@02D0 = 0000000000000000</action>
        </script>
    </cheat>

    <cheat desc="bullet speed">
        <parameter min="0x01" max="0x05" step="0x01" />
        <script state="on">
            <action>maincpu.mb@272A = 02</action>
            <action>maincpu.mb@274A = DF</action>
        </script>
        <script state="run">
            <action>maincpu.pq@02E0 = A8682B00204800A9</action>
            <action>maincpu.pq@02E8 = F2D0988804F07AA5</action>
            <action>maincpu.pq@02F0 = 0000000000000060</action>
            <!--
            02E0 | A9 xx    : lda #$xx
            02E2 | 48       : pha
            02E3 | 20 00 2B : jsr $2b00
            02E6 | 68       : pla
            02E7 | A8       : tay
            02E8 | A5 7A    : lda $7a
            02EA | F0 04    : beq $02f0
            02EC | 88       : dey
            02ED | 98       : tya
            02EE | D0 F2    : bne $02e2
            02F0 | 60       : rts
            -->
            <action>maincpu.pb@02E1 = param</action>
        </script>
        <script state="off">
            <action>maincpu.mb@272A = 2A              </action>
            <action>maincpu.mb@274A = FF              </action>
            <action>maincpu.pq@02E0 = 0000000000000000</action>
            <action>maincpu.pq@02E8 = 0000000000000000</action>
            <action>maincpu.pq@02F0 = 0000000000000000</action>
        </script>
    </cheat>

</mamecheat>

"player speed" and "bullet speed" : Moved custom routine into RAM region instead of "unmapped" area with LUA script.
$02D0 - $02F8 seem to be unused but bug may happen when other routine accesses this area.

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