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| 0x19 || No || GP0 drawing commands related. Only s16 is used (after sign extending to 32 bits)
| 0x19 || No || GP0 drawing commands related. Only s16 is used (after sign extending to 32 bits)
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| 0x1A || No || Used as a shift amount for srav opcode in GP0(80h) - Copy Rectangle (VRAM to VRAM) command. Negative value is negated to positive value...
| 0x1A || No || When value is not less than 0, different codepath for GP0 0x80 is used.  
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| 0x1B || No || Initialize PSX scratchpad memory to given value + 1. Similar setting is found in ps1_netemu on PS3. Only one game seems to rely on it.
| 0x1B || No || Initialize PSX scratchpad memory to given value + 1. Similar setting is found in ps1_netemu on PS3. Only one game seems to rely on it.
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