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This form needs two RORs to work

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That's because the first ROR pushes the 1 in bit0 into the carry bit;
the second moves the carry bit into the bit7 position, which will match
128.
This commit is contained in:
Peter Evans 2018-02-19 22:01:30 -06:00
parent d590a809d8
commit 2318b1917a
1 changed files with 1 additions and 0 deletions
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tests/mos6502.bits.c
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@ -106,6 +106,7 @@ Test(mos6502_bits, ror)
cr_assert_eq(cpu->A, 160); cr_assert_eq(cpu->A, 160);
cpu->eff_addr = 123; cpu->eff_addr = 123;
mos6502_handle_ror(cpu, 1);
mos6502_handle_ror(cpu, 0); mos6502_handle_ror(cpu, 0);
cr_assert_eq(mos6502_get(cpu, 123), 128); cr_assert_eq(mos6502_get(cpu, 123), 128);
} }