JPS5855971A - Initial loading control system for character generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an initial loading control method for a character generator, and more particularly, to a system for controlling the initial loading of a character generator. This invention relates to an initial loading control method for a character generator in a character information output system stored in an internal character generator.

A character information output system, for example, a device that constitutes a display subsystem, has an internal character generator (
C, G) are being produced. When a read-only memory (ROM) is used as this C1G, it is not necessary to rewrite the pattern information after the first writing is performed only once.

On the other hand, when random access memories are used as C and G, it is necessary to control the initial loading of pattern information from an external storage device each time the power is turned on or the like.

At this time, patterns such as alpha numeric (A/N) characters stored in the CG are managed by an internal code unique to that system, while being stored and retained in an external storage device, such as a floppy disk (FPD). If the C and G patterns are managed using EBCDIC codes or the like, a conversion interface between the two is required.

The present invention provides a conversion interface operation between C and G memories managed by internal code and an external storage device for storing C1G patterns managed by other codes such as EBCDIC code when loading C and G patterns. It is an object of the present invention to efficiently perform character generator pattern information stored in an external storage device in a predetermined order of external codes, in a predetermined order of internal codes different from the above-mentioned external codes. In a character information output system stored in an internal character generator, character generator pattern information temporary holding means reads and holds a predetermined amount of character generator pattern information stored in the external storage device, and A pattern table in which the assignment state of patterns to external code information is held and the contents thereof are read out sequentially; and an external code that holds the external code information while being updated in sequence in synchronization with the pattern table reading process. The apparatus includes an information holding means and a code conversion table that is accessed by the external code information and outputs internal code information corresponding to the external code information, and converts the external code information according to the content read from the pattern table When it is determined that a pattern has been assigned, the internal code information is sequentially output from the code conversion table using the external code information held in the external code information holding means, and the internal code information is specified by the internal code information. The character generator stored in the above medium Yarakuta generator pattern information temporary storage means is placed at the address position of the character generator.
It is characterized by storing generator pattern information.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram of a display subsystem according to an embodiment of the present invention. In the figure, 1 is a printer device in the display subsystem, 2 is a floppy disk (F
PD), 3 is track data holding memory, 4 is pattern table, 5 is entry register, 6 is EBCDI
C code register, 7 digits + 1 circuit, 8 is AND gate,
9 is a code conversion table, 1o is a C, G address register, 11 is a C, G write register, 12 is a character/
This is a generator (C, G) memory.

Oite, FPD2KHEBCDI (C in order of J,
G pattern information is stored. The track data holding memory 3 is a memory that holds pattern information read out from the FPD 2 in units of tracks.

Pattern table 4 is a table in which X°Cσ to X'FF' is divided into 8 units and indicates the presence or absence of C and G patterns corresponding to the EBCDIC code in bit correspondence. That is, the Oth to the third pattern table 4
Each IJ is made up of 1 byte (8 bits), and each bit corresponds to one EBCDIC code. For example, the 8 bits of the 0th entry are EBC
The 8 bits of the first entry correspond to the DIC code X”OO’-X’07’.
Corresponds to '08' to 'OF', and so on...
... 8 bits of the 31st entry is the EBCDIC code XV'
It corresponds to GI~X''FF'.And a certain EBCD
If the CSG pattern corresponding to the IC code exists, the bit corresponding to the EBCDIC code is set to γ; if the CSG pattern does not exist, the bit is set to V. The entry register 5 is used to read and hold the contents of the pattern table 4 entry by entry. EBCDI
The C code register 6 consists of 8 bits and is incremented by 1 as the contents of the entry register 5 are shifted. Code conversion table 9 is EBCDI
EBC accessed by the contents of C code register 6
It outputs an internal code corresponding to the DIC code.

The C, G memory is accessed by an internal code read from the 12-digit code conversion table 9, and data in the track data holding memory 3 is sequentially written to the address position corresponding to the internal code. It is something that

Only the main parts related to loading control are shown, and illustrations are omitted, but it goes without saying that the 01G memory 12
There is also a read-out circuit.

Next, FIG. 1 is a diagram showing a processing flow in the embodiment. Hereinafter, the operation of the embodiment will be explained according to the processing flow illustrated in FIG.

(1) First, the EBCDIC code register 6 is initialized. That is, it is set as 5zllIf.

(2) Next, from FPD2, EBCDIC code
The C, G pattern corresponding to the first part starting from σ is 1
The data is read track by track and stored in the track data holding memory 3.

(3) Next, the Oth entry of the pattern table 4 is read and sectored into the entry register 5. At this time, the leftmost bit FiEBcD of entry register 5
Corresponds to Ic code 1X℃σ, and the rightmost bit is EB
Compatible with CDIC code X"07".

(4) Then, when the leftmost bit of the entry register 5 is γ, the AND gate 8 is opened and the contents of the code conversion table 9 are read out based on the contents of the EBCD IC code register 6. The read contents are set in the C and G address registers 10.

(5) Also, when the leftmost bit of the entry register 5 is γ, information for the corresponding IC and G patterns is taken out from the track data holding memory 3 and set in the C1G write register 11.

Be kind! The contents of the C, G write register 11 will be written (stored) at the address location of the C, G memory 12 indicated by the +, C, G address register 10. (6) After this, the EBCDIC The contents of the code register 6 are 0(7) which is processed by +1 by the +1 circuit 7, while
In the above item (4), when the leftmost bit of the entry register 5 is ``Z'', the processes in the above (4) and (5) are not applied, and the process in the above item (6) is performed unconditionally. EB
The contents of CDIC code register 6 are incremented by 1.

(8) Next, after the processing for one track has been completed, the bit manipulation and determination processing of the special pattern table 4 is repeated, and the content previously read into the entry register 5 is shifted left by 1 bit. will be carried out.

When the leftmost bit of the entry register 5 is γ, the processes in items (4) to (6) above are performed, while when the leftmost bit is z, the same process as in item (7) above is performed. Processing is performed.

When the processing for all bits of the entry register 5 is completed, the next entry is read from the pattern table 4 and set in the entry register 5, and the same operation as above is repeated.

(9), 1) When processing for racks is completed, FP
C for one track unit located on the next track from D2
, G pattern is read out and stored in the track data holding memory 3, the operations below 0 and the above (3) are repeated.

(1o) When all the processes in the above items (2) to (9) are completed, the initial loading process to the C and G memories 12 is completed.

As a result, the printer device of the display subsystem is capable of, for example, online command processing, and various processes are executed.

Although the above embodiment is an example in which the present invention is applied to a display subsystem, the present invention is not limited to display subsystems, but is applicable to all devices that have a C1G and require initial loading control to the C1G. It is clear that it is possible.

Furthermore, the external storage device is not limited to a floppy disk.

As explained above, according to the present invention, a pattern table indicating the presence or absence of C and G patterns corresponding to an external code and an external code to internal code conversion table are created, and the CXG pattern is automatically written to the CXG memory. Since this is done, the initial loading control can be performed quickly, and the effect is extremely large.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a display subsystem according to an embodiment of the present invention, and Fig. 2 is a diagram showing a processing flow in the embodiment. In FIG. 1, 1 is a printer device in the display subsystem, 2 is a floppy disk, and 3 is a track drive.
4 is a data holding memory, 4 is a pattern table, 5 is an entry register, 6 is a UEBCDIC code register, a 9-digit code conversion table, and 12 is a character generator (C, G) memory. Bud I diagram XZ shi1

Claims (1)

[Claims] In a character information output system in which character generator pattern information stored in an external storage device in a predetermined external code order is stored in an internal character generator in a predetermined internal code order different from the external code, the external storage device character generator pattern information temporary holding means for reading out and holding a predetermined amount of character generator pattern information stored in the external code information; a pattern table that is sequentially read out; an external code information holding means that sequentially updates and holds external code information in synchronization with the pattern table reading process; and external code information that is accessed by the external code information. and a code conversion table that outputs internal code information corresponding to the above-mentioned external code information. The internal code information is read from the code conversion table using the external code information held in the code information holding means, and the character generator pattern information is temporarily held at the address position of the character generator specified by the internal code information. An initial loading control method for a character generator, characterized in that character generator pattern information held in a means is stored.