### - r -

- rate : psg_noise_t
- ratescale : opn2_operator_t
- RdBlockLen : mios32_sdcard_csd_t
- RdBlockMisalign : mios32_sdcard_csd_t
- readbits : genesis_board_t
- ReceiveOk : RXSTATUS
- release : sid_voice_t , opl3_operator_t
- releaserate : opn2_operator_t
- rellvlreg : opn2_operator_t
- repeat_ctr : mf_state_t
- reserved : _tagDIRENT , _tagEBPB32
- Reserved1 : mios32_sdcard_csd_t , mios32_sdcard_cid_t
- Reserved2 : mios32_sdcard_csd_t , mios32_sdcard_cid_t
- Reserved3 : mios32_sdcard_csd_t
- Reserved4 : mios32_sdcard_csd_t
- reserved_h : _tagBPB
- reserved_l : _tagBPB
- reservedsecs : _tagVOLINFO
- reset : genesis_board_t
- resonance : sid_regs_t
- right : opl3_channel_t
- ringmod : sid_voice_t
- root_0 : _tagEBPB32
- root_1 : _tagEBPB32
- root_2 : _tagEBPB32
- root_3 : _tagEBPB32
- rootdir : _tagVOLINFO
- rootentries : _tagVOLINFO
- rootentries_h : _tagBPB
- rootentries_l : _tagBPB
- ROWS_RECEIVED : sysex_state_t
- rowsel_dout_sr : blm_x_config_t
- rowsel_inv_mask : blm_x_config_t
- running_status : midi_track_t , midi_rec_t
- rx_buffer_ptr : iic_rec_t
- RXBUSY : _REG
- RXDCPreviouslySeen : RXSTATUS
- RXEN : _REG
- RXERIE : _REG
- RXERIF : _REG
- RXPAUS : _REG
- RXRST : _REG
- RXSTAT : PHYREG