JPH03220633A - Emulator for read only memory - Google Patents

Abstract

PURPOSE:To use an emulator for almost all of devices having read only memories ROMs by providing an interface part for external storage device, a connector part which can be replaced with a ROM, and a signal line selecting circuit which selectively supplies taken-in data, program, or the like to the connector part. CONSTITUTION:An external storage device interface part 2 is the control part to take out a file of required programs from an external storage device 1, and a main control circuit part 3 controls matching of a bus between a memory part 10 and an information processor, development of the program read from the external storage device 1 on the memory part 10, and output of the program from a connector part 11 to the information processor in accordance with the number of pins and pin assignment of the ROM emulated by this emulator. A signal line selecting circuit 7 selects a signal line to distribute the signal from a signal control circuit 5 by this control. Thus, the emulator can be used for almost all devices if they have ROMs.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a read-only memory emulator.

[Conventional technology]

Conventionally, this type of emulator replaces the CPU part including the target read-only memory IJ (ROM) with a pseudo internal circuit, and receives control and main control signals from an information processing device such as a terminal through this emulator. This allows you to know the status of registers, etc.

[Problem to be solved by the invention]

Since the conventional emulators described above replace the CPU part, they cannot be used in information processing devices without a CPU, that is, devices that are sequentially controlled according to programs in ROM, or in cases where the CPUs have different performance, shape, etc. Since the emulator is controlled using one information processing device, it has the disadvantage that the functions of the emulator cannot be used without another information processing device.

[Means to solve the problem]

The ROM emulator of the present invention has an interface section for an external storage device for importing data programs etc. from the outside into the internal rewritable memory, a connector section that can be replaced with the read-only memory that is the target device, and a ROM emulator that is stored in advance. The present invention is characterized by comprising a signal line selection circuit that selectively supplies the loaded data program, etc. to the connector section depending on the number of pins of the ROM and pin assignment information.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

The external storage device interface section 2 is a control section for retrieving necessary program files from the external storage device 1.

The main control circuit section 3 transfers the program read from the external storage device 1 and the matching path between the memory [110 and the information processing m** to the memory section 10 according to the number of pins and the visa sign of the ROM to be emulated by this device. It performs control for expanding the program into the program and outputting the program from the connector section 11 to the information processing device. Through this control, the signal line selection circuit 7 selects the signal line to which the signal from the signal control circuit 5 is directed. Necessary information is stored in the external storage device 1 in advance, and is read by the main control circuit 3 and becomes the basis for controlling the rest.

The memory unit 10 stores the program sent from the external storage device interface unit 2 in the memory 6 through the operation of the main control circuit unit 3, and transfers the contents of the memory to a target information processing device (not shown) through the connector unit 11. ).

Note that the signal control circuits 4 and 5 perform signal control for the memory 6, ie, access, data writing, data reading, etc., and timing control for the signal line selection circuit 7.

〔Effect of the invention〕

As explained above, the present invention provides the ROM of the target device and the book a.
Because it uses a tube that carries the TE, it has the advantage that it can be used with most devices that have ROM, and that this device can be used alone.

[Brief explanation of drawings]

FIG. 1 is a block diagram of the present invention. DESCRIPTION OF SYMBOLS 1... External storage device, 2... Interface section for external storage device, 3... Main control circuit section, 4, 5... Signal control circuit, 6... Memory, 7... Signal line Selection circuit, 8... ROM socket connector, 9... Input/output interface section, 10... Memory section, 11...
・Connector part.

Claims (1)

[Scope of Claims] An interface section for an external storage device for importing data programs, etc. from the outside into an internal rewritable memory, and a connector section that can be replaced with the read-only memory that is the target device, which are stored in advance. A read-only memory emulator comprising: a signal line selection circuit that selectively supplies the loaded data program, etc. to the connector section according to the number of pins of the ROM and pin assignment information.