Gestetner B147 Service Manual page 890

SERVICE RAM ADDRESSES
680406 to 68040B(H) - Modem ROM version (Read only)
680406(H) - Part number (low)
680407(H) - Part number (high)
680408(H) - Control (low)
680409(H) - Control (high)
68040A(H) - DSP (low)
68040B(H) - DSP (high)
680464(H) - Time for economy transmission (hour in 24h clock format - BCD)
680465(H) - Time for economy transmission (minute - BCD)
680482(H) - Transmission monitor volume 00 - 07(H)
680483(H) - Reception monitor volume 00 - 07(H)
680484(H) - On-hook monitor volume 00 - 07(H)
680485(H) - Dialing monitor volume 00 - 07(H)
680486(H) - Buzzer volume 00 - 07(H)
6BA000 – 6BA1FF(H) – Latest 64 error codes (Read only)
6BE988 – 6BF35F(H) – Latest 20 error communication records
B603 96 SM