193 #define SCR_REG_B(N)                            \  argument
194     case SCR_ ##N: return s->scr.N
195 #define SCR_REG_W(N)                            \  argument
196     case SCR_ ##N: return s->scr.N;             \
197     case SCR_ ##N + 1: return s->scr.N >> 8;
198 #define SCR_REG_L(N)                            \  argument
199     case SCR_ ##N: return s->scr.N;             \
200     case SCR_ ##N + 1: return s->scr.N >> 8;    \
201     case SCR_ ##N + 2: return s->scr.N >> 16;   \
202     case SCR_ ##N + 3: return s->scr.N >> 24;
203 #define SCR_REG_A(N)                            \  argument
204     case SCR_ ##N(0): return s->scr.N[0];       \
205     case SCR_ ##N(1): return s->scr.N[1];       \
206     case SCR_ ##N(2): return s->scr.N[2]
254 #define SCR_REG_B(N)                                \  argument
255     case SCR_ ##N: s->scr.N = value; return;
256 #define SCR_REG_W(N)                                \  argument
257     case SCR_ ##N: s->scr.N = (s->scr.N & ~0xff) | (value & 0xff); return; \
258     case SCR_ ##N + 1: s->scr.N = (s->scr.N & 0xff) | (value << 8); return
259 #define SCR_REG_L(N)                                \  argument
260     case SCR_ ##N: s->scr.N = (s->scr.N & ~0xff) | (value & 0xff); return;   \
261     case SCR_ ##N + 1: s->scr.N = (s->scr.N & ~(0xff << 8)) | (value & (0xff << 8)); return;     \
262     case SCR_ ##N + 2: s->scr.N = (s->scr.N & ~(0xff << 16)) | (value & (0xff << 16)); return;   \
263     case SCR_ ##N + 3: s->scr.N = (s->scr.N & ~(0xff << 24)) | (value & (0xff << 24)); return;
264 #define SCR_REG_A(N)                                \  argument
265     case SCR_ ##N(0): s->scr.N[0] = value; return;   \
266     case SCR_ ##N(1): s->scr.N[1] = value; return;   \
267     case SCR_ ##N(2): s->scr.N[2] = value; return