JPS62133537A - Read only memory simulator - Google Patents

Abstract

PURPOSE:To execute a connection irrespective of use of an IC socket by setting a read only memory to an output inhibited state, and also attaching and detaching the connection, when a data processor in which a ROM remains mounted has been connected to a ROM simulator. CONSTITUTION:A data processor 2 and a ROM simulator 1 are connected by a connector 141 through a connecting means 14, and in a state that it has been connected to the data processor 2, an enable terminal E of a ROM 21 is suppressed to an output inhibited state by an output of the connecting means 14. Accordingly, address information outputted from a data processing part 22 in this state is sent to a storage means 13 through the connecting means 14, and the corresponding data is sent to the data processing part 22 through the connecting means 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a read-only memory simulator in a data processing device.

[Conventional technology]

Conventional memory simulators are designed to install an IC at the location where the read-only memory (ROM) of a data processing device is mounted.
A socket was mounted, a VCIC plug was inserted into the IC socket, and a ROM simulator was connected in place of the ROM.

[The point of view that the invention attempts to solve]

The conventional ROM simulator described above requires an IC socket for connection to a data processing device, and has the disadvantage that the ROM simulator cannot be connected if the IC socket is not mounted and the ROM is directly mounted on the board.

An object of the present invention is to provide an R,0M simulator that can be connected to a ROM of a data processing device whether or not it uses an IC socket.

[Failure to solve the problem]

The continuous read-only memory simulator of the present invention includes a storage means for outputting data corresponding to address information obtained from a data processing device including a read-only memory to the data processing device; an input/output means for reading data written in the means; a display means for displaying information necessary for writing or reading data in the storage means according to instructions of the input/output means; and the storage means and the data processing. The device is connected to the device as a path for the address information and data, and when connected to the data processing device, output of the read-only memo IJi is prohibited, and the connection is detachable. be.

〔Example〕

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

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

One ROM simulator of this embodiment, input/output means 112
Display means 12. Storage means 13. The data processing device 2 includes a 1% (1M21.data processing section 22).

When debugging data to be written to the 0M21, this data is written from the input/output means 11 to the storage means 13. Information necessary at this time is displayed by the display means 12. In addition, when modifying a part of the data written in the storage means 13, the storage means 1
3 and displays the read data on the display means 12.
This is done by displaying the data on the screen, modifying the data, and writing it into the storage means 13.

The data processing device 2 and the ROM simulator 1 are connected via the connecting means 14 by a connector 141 as shown in FIG.
is inhibited from outputting. That is, the connection means 1
4 to resistor 2. )(, 1, a potential is applied to the enable terminal and the output is prohibited. Therefore, this R
OM data output is prohibited. In this state, the address information output from the data processing section 22 is
The data corresponding to the address information is sent from the storage means 13 to the data processing section 22 via the connection means 14.

Since the frj and ROfv 121 are in an output enabled state when the data processing device 2 and the ROM simulator 1 are not connected, data from the R and 0M 21 is sent to the data processing unit 22.

〔Effect of the invention〕

As explained above, the present invention provides a ROM for a data processing device.
A ROM simulator can be connected even when the ROM is installed, and the data written in the storage means of the OM simulator can be used in the data processing device in place of the data in the ROM of the data processing device. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram including an embodiment of the present invention, and FIG. 2 is a detailed diagram of the connecting means of FIG. 1. 1...R, 0M simulator, 2...
Data processing device, 11... Input/output means, 12.
... Display means, 13 ... Storage means, 14
...Connection means, 21...ROM, 22
...Data processing unit, 141...Connector, 几1. R2...Resistor.

Claims (1)

[Claims] a storage means for outputting data corresponding to address information obtained from a data processing device including a read-only memory to the data processing device; writing data in the storage means;
and input/output means for reading data written in the storage means, display means for displaying information necessary for writing or reading data in the storage means according to instructions from the input/output means, and the storage means. Connecting means is connected to the data processing device as a path for the address information and data, and when connected to the data processing device, the read-only memory is inhibited from outputting, and the connection is detachable. A read-only memory simulator characterized by: