30 lines
864 B
C
30 lines
864 B
C
#define NANJING_reg regByte
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static void NANJING_sync () {
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setprg32(0x8000, NANJING_reg[2] <<4 &0x30 | NANJING_reg[0] &0x0F | (NANJING_reg[3] &4? 0x00: 0x03) | prgOR >>2);
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setchr8(0);
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setmirror(mapperFlags &4? MI_H: MI_V);
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}
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static DECLFW(NANJING_writeReg) {
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NANJING_reg[A >>8 &3] =V;
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sync();
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}
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static void NANJING_horizontalBlanking(void) {
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if (NANJING_reg[0] &0x80 && scanline <239) { /* Actual hardware cannot look at the current scanline number, but instead latches PA09 on PA13 rises. This does not seem possible with the current PPU emulation however. */
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setchr4(0x0000, scanline >=127? 1: 0);
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setchr4(0x1000, scanline >=127? 1: 0);
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} else
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setchr8(0);
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}
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void NANJING_reset(uint8 clearRegs) {
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sync =NANJING_sync;
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GameHBIRQHook = NANJING_horizontalBlanking;
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SetWriteHandler(0x5000, 0x53FF, NANJING_writeReg);
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sync();
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}
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#undef NANJING_reg
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