Gestetner B003 Service Manual page 746

68039B to 68039F – Option G3 board (G3-3) ROM information (Read only)
68039B(H) - Suffix (BCD)
68039C(H) - Version (BCD)
68039D(H) - Year (BCD)
68039E(H) - Month (BCD)
68039F(H) - Day (BCD)
6803A2(H) - Option G3 board (G3-2) modem ROM version (Read only)
6803A4(H) - Option G3 board (G3-3) modem ROM version (Read only)
6803A6 to 6803AB(H) - Modem ROM version (Read only)
6803A6(H) - Part number (low)
6803A7(H) - Part number (high)
6803A8(H) - Control (low)
6803A9(H) - Control (high)
6803AA(H) - DSP (low)
6803AB(H) - DSP (high)
680406(H) - Time for economy transmission (hour in 24h clock format - BCD)
680407(H) - Time for economy transmission (minute - BCD)
680422(H) - Transmission monitor volume 00 - 07(H)
680423(H) - Reception monitor volume 00 - 07(H)
680424(H) - On-hook monitor volume 00 - 07(H)
680425(H) - Dialing monitor volume 00 - 07(H)
680426(H) - Buzzer volume 00 - 07(H)
SM
SERVICE RAM ADDRESSES
3-89 B003/B004/B006/B007