Specifications

Contents–iv
3 Software Interface
3.1 Q-bus Interface . . . ............................... 32
3.1.1 Control and Status Register ....................... 32
3.2 Resetting the DECvoice Module ...................... 36
3.3 Data Transfer Scheme ............................. 37
3.3.1 Rings . ....................................... 37
3.3.1.1 Buffer Structure .............................. 39
3.3.2 Interrupts .................................... 42
3.3.2.1 Interrupt Scheme ............................. 42
3.3.3 Commands and Messages . ....................... 43
3.3.3.1 Command Format ............................ 43
3.3.3.2 Message Format .............................. 45
3.4 Initialization .................................... 46
3.4.1 Stage 1 ....................................... 46
3.4.2 Stage 2 ....................................... 47
3.4.3 Stage 3 ....................................... 47
3.5 Basic ROM Commands ............................ 48
3.5.1 LOAD . ....................................... 48
3.5.2 JUMP. ....................................... 50
3.5.3 STATUS ...................................... 51
3.5.3.1 STATUS Command ........................... 51
3.5.3.2 Status Message .............................. 52
4 Telephone Interface
4.1 SLD Interface.................................... 55
4.1.1 SLD System ................................... 57
4.1.2 DECvoice Modifications to the Intel SLD Interface ..... 57
4.1.2.1 SLD Data Lead .............................. 57
4.1.2.2 Identification Data Byte . ....................... 58
4.1.2.3 Reset Line . . . ............................... 58
4.1.3 Connection Between the Module and TLI ............ 59
4.2 North American Telephone Line Interface .............. 61
4.2.1 TLI to Telephone Line Connection .................. 61