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added assert for index out-of-bounds access in z8536_device::external_port_w() with apple3 (nw)
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@ -828,6 +828,7 @@ void z8536_device::external_port_w(int port, int bit, int state)
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case PORT_A:
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case PORT_B:
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{
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assert((PORT_A_DATA_DIRECTION + (port << 3)) >= 0 && (PORT_A_DATA_DIRECTION + (port << 3)) < ARRAY_LENGTH(m_register));
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UINT8 ddr = m_register[PORT_A_DATA_DIRECTION + (port << 3)];
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if (!BIT(ddr, bit)) return;
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