Ricoh D072 Service Manual page 592

Initial modem type for 9.6 k or
7.2 kbps.
Bit 5: 0, Bit 4: 0 = V.29
4-5
Bit 5: 0, Bit 4: 1 = V.17
Bit 5: 1, Bit 4: 0 = V.34
Bit 5: 1, Bit 4: 1 = Reserved
6-7 Not used
SM Appendix
These bits set the initial modem type for 9.6 and
7.2 kbps, if the initial modem rate is set at these
speeds.
Do not change the settings.
7-53
Bit Switches
D067/D068/D069/D072