JPS59176813A - Loading system for initial program - Google Patents

Abstract

PURPOSE:To load an initial program without opening a closed circuit which is under execution by loading the program excepting the circuits which are related to a circuit connected to a host computer. CONSTITUTION:A control part A delivers a signal IPL1 in a normal initial program loading mode. This signal IPL1 resets all of a circuit scanning mechanism D0 and adaptors D1-Dn. A signal IPL2 is delivered wien an instruction related to the initial program loading action, e.g. a damping instruction is given from a host computer. In this case, the host computer is connected to a communcation control processor via a circuit to perform transmission and reception of data. Therefore the circuit related to the mechanism D0 and especially to an MODEM interface MDi is not reset.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to a terminal device connected to a host computer via a line, and particularly relates to initial program loading of a remote communication control processor.

(2) Background of the technology Large computers are sometimes used as host computers for TSS (time sharing systems) because of their processing capabilities. In this TSS, a telephone line such as a public line or a private line is generally used for connection between a host computer and a terminal, that is, for data transfer. When using these telephone lines, a modem is required.
Host computers and terminals have these modem interfaces.

On the other hand, in the above-mentioned system, a communication control processor is used to control lines, etc., and the above-mentioned modem interface is controlled by this communication control processor.

(3) Prior Art and Problems FIG. 1 is a system configuration diagram of an example of a computer system such as the above-mentioned TSS. A local communication control processor LCCP is connected to a large computer, ie, a host computer CPU. All controls and data transfer for data communication are performed by this local communication processor LCCP. and local communication processor LC
The CP has a modem interface (not shown), and is connected to the modem 1 and the network control unit NCU 1 via the modem interface. The output of modem 1 is NCUl
It is connected to line L1 via. This network control unit performs line connection control, for example, by outputting a dial signal in response to instructions from a host computer, and connects the line. On the other hand, although not shown, a remote communication control processor R is connected to a terminal device, etc.
The CCP has a modem interface as described above, and is connected to the modem 2 and the network control unit NCU2 via the interface. And the output of modem 2 is network control unit NCU2
is connected to line L2 via. Similarly to the above, the remote communication processor RCCP performs all controls as a remote device for data communication, and the network control unit NCU is a line control device, for example, detects a bell signal and closes the line.

Lines L1 and L2 are connected to exchange 3, and are connected by signals from network computers NCUI and NCU2. For example, in order to connect a host computer and a remote communication processor and perform data communication, the network control unit NCU 1 first outputs a dial signal under control from the host computer. Then, the exchange performs a switching operation to connect to the target terminal, for example. This electrically connects the host computer CPU and remote communication control processor to enable data communication.

On the other hand, for example, when the host computer CPU detects an abnormality in the remote communication control processor RCCP or when de-hazing the TSS system, the remote communication control processor must dump its memory in response to a command from the host computer CPU. There may be cases where this is not the case.

At this time, a network control program is loaded into the remote communication control processor RCCP. Since this program generally does not include a dump program, the remote communication control processor RCCP must load the dump program into the memory by the dump command from the host computer CPU described above.

That is, at this time, the remote communication control processor RCCP performs an initial program operation and loads a dump program from the auxiliary storage device. This allows the memory of the remote communications processor to be dumped.

However, since the above-mentioned initial program load also resets its modem interface, the network control unit's E R (
The Equipment Ready signal is turned off, and the exchange electrically disconnects line L1 and line L2. For this reason, it has not been possible to easily perform a dump operation based on instructions from the host computer CPU. That is, the remote communication control processor currently has a problem in that it must remember that the line has been connected and that a dump command has been issued by the host computer, and then perform the dump operation after reconnecting the line while loading the dump program. Ta.

(4) Purpose of the Invention The present invention is intended to solve the above-mentioned problems, and its purpose is to provide a remote communication control processor with a circuit related to the modem ink face in response to an initial program load command from a host computer. The object of the present invention is to provide an initial program operation method for a remote communication control processor that does not require reset.

(5) Structure of the Invention The present invention is characterized in that the remote communication control processor has an eleventh and second initial program loading function, and the first initial program loading function is connected to the line connected to the host computer. An initial program load operation is performed except for circuits related to the control circuit, and the second initial program load function performs an initial program load operation including circuits related to the line control circuit, and the first initial The program load function is an initial program operation method characterized by operating in response to instructions related to initial program load from a post computer connected via a line.

(6) Examples of the invention Hereinafter, the present invention will be explained in detail using the drawings.

FIG. 2 is a block diagram of a remote communication control processor according to an embodiment of the present invention.

Remote communication control processor R
CCP is control unit A1 line scanning mechanism Do, adapter D1~
Dn, a logic circuit B, a memory MM, an auxiliary storage device AM, and a processor unit (not shown). Control unit A is a signal IP
It outputs LI and signal IPL2. The line scanning mechanism has a modem interface and manages serial data lines and control signal lines that control the modem. The adapter D+-Dn is an interface for other circuits (not shown), and is connected to an input/output device such as a floppy disk. The memory MM is for storing programs to be executed by this processor and data such as transmission and reception. The auxiliary storage device AM is, for example, a disk device or the like, and stores data, programs, and other items for operating this system. Although these circuits and devices are not shown, they are connected to the processor of the present device by path lines. It then operates as a communication control processor via the aforementioned path line.

Since the present invention relates to the initial program load signal, circuit connections other than the signals IPLI and IPL2 are omitted to simplify the explanation. During a normal initial program load operation, that is, an initial program operation performed locally independent of the host computer, the control unit A outputs the signal IPLI. The output signal lPLL is sent to the line scanning mechanism Do and the logic circuit B.
input to adapters D1 to Dn via. This signal connects the line scanning mechanism Do and the adapters D1 to Drl.
All circuits are reset. That is, the modem interface MDi of the line scanning mechanism is also reset.

On the other hand, the signal I P L 2 is output when receiving a command related to the initial program load sent from the host computer, such as a dump command (initial program load operates immediately before executing the dump command). At this time, the host computer and the communication control processor are connected by a line and data is sent and received, so this signal IPL2 is directly input to the line scanning mechanism Do, but the line scanning fi, especially the modem interface MDi, Do not reset related circuits. Further, the signal IPL2 is applied to the adapters D1 to Dn via the logic circuit B. Since the signal IPL2 is applied to the adapter D+=Dn at the same terminal as the aforementioned signal IPLI, all adapters D1-Dn are reset. still,
If the signals IPLI and IPL2 are at high level and the initial program load operation is performed, that is, the signals are positive logic,
Logic circuit B is an OR circuit having OR logic. Also,
If the low level indicates an initial program load operation, that is, negative logic, it is an AND circuit.

(7) Effects of the Invention As described above, the present invention relates to the initial program load signal of the remote communication control processor, and by using the present invention, the present invention can also be applied to the initial program load executed through the line. Communication with the host computer can be continued even after the initial program has been loaded, without having to open a previously closed line, such as when executing a dump command from the host computer. becomes.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram for performing data communication between a host computer and a remote communication control processor, and FIG. 2 is a configuration diagram of a remote communication control processor according to an embodiment of the present invention. A...Control unit B...Logic circuit Do...Line scanning mechanism D1-Dn...Adapter patent applicant Fujitsu Limited

Claims (1)

[Claims] The remote communication control processor has first and second initial program loading functions, and the first initial program loading function performs an initial program loading operation except for circuits related to the line control circuit connected to the post computer. The second initial program load function performs an initial program load operation including circuits related to the line control circuit, and the first initial program load function executes an initial program load operation including circuits related to the line control circuit, and the first initial program load function executes an initial program load operation including circuits related to the line control circuit. An initial program operation method characterized by operating in response to instructions related to initial program loading.