Mercurial > repos > blastem
comparison z80.cpu @ 1738:d6157b7eb20c
Implemented DAA in new Z80 core
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Mon, 04 Feb 2019 21:43:59 -0800 |
| parents | 06c2438c7641 |
| children | 435877da5837 |
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| 1737:2207cd2bae14 | 1738:d6157b7eb20c |
|---|---|
| 2169 sub 2 pc pc | 2169 sub 2 pc pc |
| 2170 cycles 5 | 2170 cycles 5 |
| 2171 | 2171 |
| 2172 end | 2172 end |
| 2173 | 2173 |
| 2174 | 2174 00100111 daa |
| 2175 local diff 8 | |
| 2176 local tmp 8 | |
| 2177 local low 8 | |
| 2178 and 0xF a low | |
| 2179 and 0x8 chflags tmp | |
| 2180 if tmp | |
| 2181 | |
| 2182 mov 6 diff | |
| 2183 | |
| 2184 else | |
| 2185 | |
| 2186 cmp 0xA low | |
| 2187 if >=U | |
| 2188 mov 6 diff | |
| 2189 else | |
| 2190 mov 0 diff | |
| 2191 end | |
| 2192 | |
| 2193 end | |
| 2194 | |
| 2195 and 0x80 chflags tmp | |
| 2196 if tmp | |
| 2197 | |
| 2198 or 0x60 diff diff | |
| 2199 | |
| 2200 else | |
| 2201 | |
| 2202 cmp 0xA0 a | |
| 2203 if >=U | |
| 2204 or 0x60 diff diff | |
| 2205 end | |
| 2206 end | |
| 2207 | |
| 2208 if nflag | |
| 2209 | |
| 2210 sub diff a a | |
| 2211 update_flags SZYHPXC | |
| 2212 | |
| 2213 else | |
| 2214 | |
| 2215 add diff a a | |
| 2216 update_flags SZYHPXC | |
| 2217 | |
| 2218 end | |
| 2219 | |
| 2220 | |
| 2221 | |
| 2222 |