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In the x86 computer architecture, HLT (halt) is an assembly language instruction which halts the central processing unit (CPU) until the next external interrupt is fired. [1] Interrupts are signals sent by hardware devices to the CPU alerting it that an event occurred to which it should react.
The Intel 8085 ("eighty-eighty-five") is an 8-bit microprocessor produced by Intel and introduced in March 1976. [2] It is the last 8-bit microprocessor developed by Intel. It is software-binary compatible with the more-famous Intel 8080 with only two minor instructions added to support its added interrupt and serial input/output features.
The instructions are usually part of an executable program, often stored as a computer file and executed on the processor. The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new functionality.
x86 assembly language is a family of low-level programming languages that are used to produce object code for the x86 class of processors. These languages provide backward compatibility with CPUs dating back to the Intel 8008 microprocessor, introduced in April 1972.
Read from bank 1 of the register file (includes visible and invisible CPU registers) RARF2: 0F 3D: Read from bank 2 of the register file RARF3: 0F 3E: Read from bank 3 of the register file LTLB: 0F F0: Load TLB with page table entry RCT: 0F F1: Read cache tag WCT: 0F F2: Write cache tag RCD: 0F F3: Read cache data WCD: 0F F4: Write cache data ...
D3 doing nothing, has been halted by the HLT instruction; D4 writing data to an output port; D5 reading the first byte of an executable instruction; D6 reading data from an input port; D7 reading data from memory; 4: D5 5: D6 6: D7 7: D3 8: D2 9: D1 10: D0 11: −5 V — The −5 V power supply.
The SDK-85 MCS-85 System Design Kit was a single board microcomputer system kit using the Intel 8085 processor, clocked at 3 MHz with a 1.3 μs instruction cycle time. It contained all components required to complete construction of the kit, including LED display, keyboard, resistors, caps, crystal, and miscellaneous hardware.
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