IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Write Diagnostic Control0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 X X X 0 0 1 0 0 0 0 0 1 0 1 1 0 0 1 1 0 0 0 0 0 0 0 0I I I I 1 1 II 1 1 1 1 III 1111 1 1 1 1 1 1....■••••,,•••■•■0 8-F 2 0 B 3 0 0This command uses bits 8 to 15 of the register specified by the R field or the accumulatorif 11=000, to perform various functions in diagnostic mode. It can be used to simulatetransmit and receive conditions; to control the BSCA so that problems can be diagnosed.Register Bits8 Serial receive data. This bit is applied to the input of the shift register to simulatereceive data.9 Bit step. This bit steps a binary trigger that simulates the clocks received from amodem or internal clock card. Trigger output advances the bit ring which advancesthe shift register, BCC register, and other associated hardware. Two write diagnosticcontrol commands (with this bit on) are needed to advance the bit ring by one.10 Internal clock step. This bit simulates the 384 KHz oscillator when internal clock isinstalled. To advance the transmit/receive clock by one, the number of write diagnosticcontrol commands (with this bit on) needed are:1280 for 600 bits per second640 for 1200 bits per second384 for 2000 bits per second320 for 2400 bits per second11 Reset diagnostic operation. Diagnostic mode is reset when a diagnostic command isissued with this bit on.12 Ring indicator. This bit is used to simulate a "ring" from a switched line.13 Set interrupt request. This bit set on initiates a BSCA interruption in order toisolate the interruption mechanism from normal BSCA controls.14 Inhibit cycle steal clock. With this bit on, the program can issue write address andinitiate I/O commands without the DCB being fetched. This permits the program toread the residual address from the BSCA storage address register and verify that thecontents are as issued by the write address and initiate I/O commands.15 Set multipoint selected latch. This bit is used to simulate a selection sequence fortesting the multipoint feature.Reset BSCA0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 XXX 0 0 1 0 0 0 0 0 1 1 1 1 0 0 1 1 0 0 0 0 0 0 0 0I I I I II II I I I I I I 1 1 1 1 I I 1 I`••■•••••\ eon.,0 8-F 2 0 F 3 0 0This command resets the BSCA except for the prepare information and the SAR. If thehost attach switch on the System/7 console is in the enable and IPL position, monitormode is entered. This command does not cause an interruption. The R field in thiscommand is ignored.Binary Synchronous Communications Adapter 8-9P qM11' ,11 M I 1 II