46 lines
928 B
C
46 lines
928 B
C
/*
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* Convert "cell arrange" address to normal address.
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* (C) notaz, 2008
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*
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* This work is licensed under the terms of MAME license.
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* See COPYING file in the top-level directory.
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*/
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// 64 x32 x16 x8 x4 x4
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static unsigned int cell_map(int celln)
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{
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int col, row;
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switch ((celln >> 12) & 7) { // 0-0x8000
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case 0: // x32 cells
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case 1:
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case 2:
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case 3:
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col = celln >> 8;
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row = celln & 0xff;
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break;
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case 4: // x16
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case 5:
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col = celln >> 7;
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row = celln & 0x7f;
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row |= 0x10000 >> 8;
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break;
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case 6: // x8
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col = celln >> 6;
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row = celln & 0x3f;
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row |= 0x18000 >> 8;
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break;
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case 7: // x4
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col = celln >> 5;
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row = celln & 0x1f;
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row |= (celln & 0x7800) >> 6;
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break;
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default: // never happens, only here to make compiler happy
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col = row = 0;
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break;
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}
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return (col & 0x3f) + row*64;
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}
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