Ochepyatka.

Hello, Arseniy Astapenko! I remember, on 13 Jan 98 you took it and launched
in All with this:

>> To output:

>> 4 - test bit
>> 5 - pick up the handset
>> 6 - dial a number (in this case, bit 4 should be equal to 0)

AA> typo, bit 5

ATTENTION!!! I confirm, indeed bit 5.

>> 7 - data for transmission according to the tape recorder principle

>> For input:

>> 4 - input from comparator 1 (signal from the line according to the tape recorder principle).
>> Used to determine signals from the telephone exchange (BUSY, Dialtone, etc). 5
>> - What you output in 4 bits.
>> 6 - input from the bell sensor (pulses are coming). 7 - input from comparator 2.
>> Used to receive data.

AA> In the Minsk circuit, bits 4 and 7 for input are equal (shorted
AA> with a jumper). But in all drivers the difference is taken into account.

Bye, with a pack of viches, Pavel Fedin.