JP2861673B2 - ROM reading control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ROM reading control device. A printer device that prints data in combination with a personal computer, an office computer for office automation, or the like has a built-in CPU, and the CPU serves as an external storage device in a control ROM (read only) that stores a program mounted on the device body. The printing control of the printer device is performed by reading (accessing) the font ROM storing the character pattern to be printed and the only memory.

[0002] Font ROM mounted on a printer
Means multiple fonts RO for each type of character pattern used
M can be mounted. Although there are a plurality of machine numbers (also called slots) to which the ROM is mounted, unlike a font ROM having no address information such as a program command, a control ROM stores a program which refers to a fixed address. The mounting machine number is fixed, for example, machine number # 0.

[0003] If a wrong machine number is required to be installed in the control ROM, a problem arises in that normal printer control cannot be performed.

[0004]

2. Description of the Related Art FIG. 5 is an explanatory view of a read control section of a ROM. FIG. 5 shows an example of a control unit of the printer device when the printer device is connected to a processing device such as a personal computer.

The control unit 60 includes a CPU 65 and a control program
A RAM (read / write memory) 61 in which 62 is stored;
It comprises a connector section 64 and a read signal transmitting section 66.
The connector section 64 has slots 64-i (i = 0, 1, 2, 3) in which a ROM functioning as an external storage device is mounted, and a machine number is assigned to each slot.

The font ROM 25 is mounted in the slots 64-1, 2, 3 (machine numbers # 1 to 3), and the control ROM 16 is mounted in the slots 64-0.
Attached to. (1) Read control ROM. The control unit 60 is connected to the processing device 7 composed of, for example, a personal computer or the like.
And print control is performed by reading and executing the program in the control ROM 16 attached to the machine number # 0.

(2) Font ROM reading. The font ROM 25 stores a set of character patterns (called a font) used for printing by the printer device.
The data is read into the RAM 61 by the PU 65 and used for print control.

(3) Reading of the mounted ROM. The storage area of the ROM (the control ROM 16 or the font ROM 25) mounted on the connector unit 64 includes the machine numbers # 0 to # 3.
The address area is configured so as to correspond to the device number as shown in the access address of the ROM in FIG. ROM mounted on connector section 64
Is read by a read signal transmitted by the read signal transmitting unit 66. The generation of the read signal will be described below with reference to a conventional ROM cartridge reading circuit diagram of FIG.

FIG. 6 shows a circuit configuration of the read signal transmitting section 66, which comprises a decoder 53 and an AND gate 55. Address signals A1 and A2 (00,01,10,11 are input) designating the mounting machine number (machine number # 0,1,2,3) are input from the CPU 65 to the decoder 53, and the decoder 53 Output signals Di (i = 0, 1, 2, 3) for selecting one of the mounting machine numbers
Output to D gate 55.

On the other hand, a ROM read signal CE (Chip Enabl
e) is input to the AND gate 55, the output signal Di
And the logical product of the ROM read signal CE and the read signal CE
i (i = 0, 1, 2, 3) is output, and the ROM mounted on the corresponding machine number #i (machine number # 0, 1, 2, 3) is accessed.

The access area of the ROM accessed by the read signal CEi is, for example, in the case of the read signal CE2, the address 2000-2FFF of the ROM mounted on the machine number # 2.
(Hex) is accessed.

A control ROM to be originally mounted on the machine number # 0
16 is attached to, for example, the machine number # 2, the read signal CE
No. 2 makes an access by recognizing the access area as addresses 2000 to 2FFF. However, the address referred to by the program instruction stored in the control ROM 16 is “0000”.
~ 0FFF (hexadecimal) "(the program in the control ROM is resident at addresses 0000 to 0FFF). A non-functional situation occurs.

In the case of the font ROM 25, since the contents of the ROM are character pattern data, that is, numerical data that does not include address information referred to by instructions or the like, the ROM is attached to any of the machine numbers # 1, # 2, and # 3. However, no abnormality due to the access area occurs.

[0014]

However, there is a problem that normal printing control cannot be performed if the mounting machine number of the control ROM is wrong.

An object of the present invention is to enable normal printing control regardless of which machine number the control ROM is attached to.

[0016]

FIG. 1 is a block diagram showing the principle of the present invention. Printer control ROM 11 and phone
A connector section for mounting the ROM 12;
A read signal transmitting unit 5 for transmitting a read signal for reading
In ROM read controller means having a connector mounted
Output to the specified terminal position of the
The control ROM 11 provided with a detection signal for detecting the control ROM 11 and the control ROM 11 from the read signal transmitting unit 5 are read.
By enter the read signal because, provided the control ROM selection unit 15 which transmits the read signal to the connector it detects the detection signal from the control ROM 11, us the object
Is made .

[0017]

When the read signal is received from the control ROM reading unit 1, the control ROM selecting unit 15
11 is based on the detection signal output to be attached, the
A read signal is transmitted to the mounting connector and the control ROM 11
Ri Do to access, equally it becomes accessible and the control ROM11 is as if attached to the device number 0 is also mounted on the machine number of the non-device number 0.

[0018]

FIG. 4 shows a block diagram of a ROM reading control unit according to an embodiment. FIG. 4 shows an example of a block configuration in which the processing device 7 such as a personal computer and the control unit 50 of the printer device are combined.

The control unit 50 includes a CPU 65 and a control program.
A connector section 4 having slots 40, 41, 42, and 43 in which a ROM is mounted;
It comprises a reading signal transmitting section 5 having an M reading section 1 and a font ROM reading section 2, and a control ROM selecting section 15.

The control ROM 11 or the font ROM 12 has slots 4 corresponding to the machine numbers # 0 to # 3 of the connector section 64.
0, 41, 42, and 43, and accessed by the CPU 65. FIG. 2 shows a selection circuit diagram for ROM reading according to the embodiment. FIG. 2 shows a circuit configuration of the read signal transmitting section 5 for transmitting a read signal to the ROM required when the CPU 65 accesses (reads) the ROM, and the control ROM selecting section 15.

That is, the read signal transmitting unit 5 includes the decoder 53 and A
The control ROM selecting section 15 includes an ND gate 55, 54-1, 2, and 3. Next, according to the connection explanation diagram of the control ROM in the connector section of FIG.
The connection of the ROM mounted on the connector unit 4 will be described.

FIG. 3 shows that the control ROM 11 has slots 40, 41, 4
2, 43 is shown, and the connector section 4 is composed of 40 pins. When the control ROM 11 is mounted on the connector unit 4, a signal based on 5 V input from the control unit 50 by the mounting is transmitted to a pin of the control ROM 11.
The detection signal Ki (i = 0, 1, 2, 3) is sent to the control unit side via 20.
Outgoing. That is, the control ROM 11 mounted on the slot 42 (machine number # 2) outputs the detection signal K2 to the AND gate 56 of the control ROM selection unit 15 (FIG. 2).

The font ROM 12 sets the pin 20 on the ROM side to an unused state (not connected to the other pins 01, 02, 03, 04, etc.), and the detection signal Ki is transmitted even when the font 20 is attached to the connector section 4. Not done.

In FIG. 2, a read signal transmitting unit 5 is a CPU.
When an address signal A1, A2 (00,01,10,11) designating the mounting machine number (machine number # 0,1,2,3) is input from 65, the decoder 53
Output a signal for selecting any one of the machine numbers # 0, 1, 2, and 3.

When the decoder number # 0 is selected (address signals A1, A2 = 00), the decoder 53 performs an AND operation on the control ROM reading unit 1.
A signal is output to the gate 55, and when the machine numbers # 1 to # 3 are selected (address signals A1, A2 = 01, 10, 11), the machine numbers # 1 to # 1 are output.
AND gate 54 of font ROM reading unit 2 corresponding to 3
Output signals to -1,2,3.

When the machine number # 0 is selected. When the ROM read signal CE for reading the ROM is input to the AND gate 55, the AND gate 55 outputs the read signal CE.
0 is output to the AND gate 56 of the control ROM selector 15.
The AND gate 56 is connected to the read signal CE0 and the control ROM11.
Of the control ROM 11 attached to the machine number i, and sends a read signal Ci (i = 0, 1, 2, 3) to obtain the logical product of the detection signal Ki and the control signal. RO
Access M11.

When the machine numbers # 1, 2, 3 are selected. When the ROM read signal CE for reading the ROM is input to the AND gate 54-j (j = 1, 2, 3), the decoder 53 The AND gate 54-j (j =
1, 2, 3) is a read signal CEj for reading the font ROM 12 attached to the machine number j (j = 1, 2, 3) of the connector section 4.
(J = 1,2,3) to access the control ROM 11.

[0028]

As described above, in a ROM reading control device having a plurality of ROM mounting machine numbers, a control ROM can be mounted on an arbitrary machine number.

[Brief description of the drawings]

FIG. 1 is a block diagram showing the principle of the present invention.

FIG. 2 is a circuit diagram of a ROM reading selection circuit according to an embodiment;

FIG. 3 is an explanatory diagram of connection of a control ROM in a connector section.

FIG. 4 is a block diagram of a ROM reading control unit according to the embodiment;

FIG. 5 is an explanatory diagram of a read control unit of a ROM.

FIG. 6 is a circuit diagram of a conventional ROM cartridge reading circuit.

FIG. 7 ROM access address

[Explanation of symbols]

 1 is a control ROM reading section, 11,16 is a control ROM, 12,25 is a font ROM, 15 is a control ROM selection section, 2 is a font ROM reading section, 4,64 is a connector section, 40,41,42,43, 64-0,1,2,3 are slots, 5,66 are read signal transmitters, 50,60 are controllers, 53 is decoders, 54-1,2,3,55,56 are AND gates, 61 is RAM , 62 is a control program, 65 is a CPU, 7 is a processing device, A1 and A2 are address signals, C0, C1 to C3, CE0, CE1 to CE3 are read signals, CE is a ROM read signal, and DO, D1 to D3 are outputs. The signals KO, K1 to K3 represent detection signals.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B41J 5/44 B41J 5/30 B41J 29/00 G06F 12/06 510

Claims (1)

(57) [Claims] A control ROM and a font for a printer device
A connector for mounting a ROM, and a
Equipped with a read signal transmitting section for transmitting a read signal for
In the M reading control device, the control output to a predetermined terminal position of the attached connector
Provided a detection signal to detect ROM
Said control ROM, enter the read signal <br/> for reading the control ROM from the read signal transmitting unit, the read signal to the test known to connector the detection signal from the control ROM ROM read controller means, characterized in that the control ROM selection unit for transmitting, was provided.