2010-06-08 19:37:08 -06:00
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; This test tries to figure out a couple of unknown opcodes.
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incdir "tests"
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include "dsp_base.inc"
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// 0x02ca is an unknown opcode found in Zelda ucodes.
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// 0x02ca logically shifts (not rotates) the whole ACC0 right by signed 16-bit value AC1.M
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// (So, if AC1.M is negative, it shifts left).
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// We'll call it lsrn, no arguments.
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// 0x02cb is the same opcode, but arithmetic.
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// We'll call it asrn, no arguments.
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clr $ACC0
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clr $ACC1
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lri $AC0.H, #0
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lri $AC0.M, #256
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//neg $ACC0
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lri $AC0.L, #1
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lri $AC1.H, #0xFF
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lri $AC1.M, #1
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lri $AC1.L, #0xFF
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call send_back
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cw 0x02ca
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call send_back
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cw 0x02ca
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call send_back
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cw 0x02ca
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call send_back
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cw 0x02ca
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call send_back
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jmp end_of_test
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