| 摘要 |
PURPOSE:To perform the conversion of codes at a high speed by converting an EBCDIC code into an ASCII code and vice versa in terms of hardware. CONSTITUTION:The 1st and 2nd operand registers 1 and 2 convert the ASCII codes into the EBCDIC codes and vice versa. An OR is calculated 3 between the outputs of both registers 1 and 2, and the output of this calculation is stored in a 3rd operand register 4. In the case the ASCII code is converted into the EBCDIC code by the third register 3, a flag is set at 1 only when the hexadecimal '30' is converted into '39'. While the flag is set at 1 only when the hexadecimal 'F0' is converted into 'F9' in the case the EBCDIC code is converted into the ASCII code. Then an address of a RAM 14 is selected by the byte of the corresponding register 2 when the flag is kept at 0. Then the code-converted outputs are stored in the register 4 for each byte. |
