R00
u8 reg = state->regs[R00];
upd64031a_write(sd, R00, reg | 0x10);
upd64031a_write(sd, R00, reg & ~0x10);
r00 = (state->regs[R00] & ~GR_MODE_MASK) | state->gr_mode;
r05 = (state->regs[R00] & ~SYNC_CIRCUIT_MASK) |
upd64031a_write(sd, R00, r00);
r00 = (state->regs[R00] & ~(3 << 6)) | state->mode;
upd64083_write(sd, R00, r00);