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1.发明公开A nibble and word addressable memory to accessing consecutive data units for supporting decimal arithmetic operations 失效用于访问支持十进制算术运算的协调数据单元的可信和可读存储器
公开(公告)号：EP0136656A3
公开(公告)日：1986-07-16
申请号：EP84111463
申请日：1984-09-26
IPC分类号： G06F09/30
CPC分类号： G06F9/3001 , G06F9/30025 , G06F9/3877
摘要： A data processing system having a central processing unit (CPU) capable of performing binary and decimal arithmetic software instructions is described. The CPU includes a microprocessor which executes the binary arithmetic software instructions under firmware control. The CPU also includes commercial instruction logic which is used in conjunction with the microprocessor to execute decimal arithmetic operations. The commercial instruction logic also operates under firmware control with the addressing of the firmware microinstructions being controlled by the microprocessor. Also disclosed is the method by which the CPU performs decimal addition, subtraction, multiplication and division arithmetic operations and the method used to convert a number in a binary format to a number in a decimal format and the method used to convert a number in a decimal format to a number in a binary format.
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2.发明公开Apparatus and method for converting a number in binary format to a decimal format 失效将二进制格式中的数字转换为十进制格式的装置和方法
公开(公告)号：EP0140158A3
公开(公告)日：1986-04-23
申请号：EP84111464
申请日：1984-09-26
CPC分类号： H03M7/08
摘要： A data processing system having a central processing unit (CPU) capable of performing binary and decimal arithmetic software instructions is described. The CPU includes a microprocessor which executes the binary arithmetic software instructions under firmware control. The CPU also includes commercial instruction logic which is used in conjunction with the microprocessor to execute decimal arithmetic operations. The commercial instruction logic also operates under firmware control with the addressing of the firmware microinstructions being controlled by the microprocessor. Also disclosed is the method by which the CPU performs decimal addition, subtraction, multiplication and division arithmetic operations and the method used to convert a number in a binary format to a number in a decimal format and the method used to convert a number in a decimal format to a number in a binary format.
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