The 8085 is supplied in a 40-pin DIP package.

Intel produced a series of development systems for the 8080 and 8085, known as the MDS-80 Microprocessor System. The 8085 Microprocessor is a first and perfect design microprocessor among all who was having all the operation features to use on a computer. It has a bubble memory option and various programming modules, including EPROM, and Intel 8048 and 8051 programming modules which are plugged into the side, replacing stand-alone device programmers. 8355-16,384-bit (2048 ×8) ROM with I/O. it is set if bit 7 of the accumulator is set). Pin 39 is used as the Hold pin. Instructions such as PUSH PSW, POP PSW affect the Program Status Word (accumulator and flags). b����N��9�3! The sign flag is set if the result has a negative sign (i.e. The 8085 uses approximately 6,500 transistors.[3]. He felt that programming through read-only memory and general-purpose registers could replace the separate (i.e. The "5" in the part number highlighted the fact that the 8085 uses a single +5-volt (V) power supply by using depletion-mode transistors, rather than requiring the +5 V, −5 V and +12 V supplies needed by the 8080.

215 0 obj <> endobj The 8085 has extensions to support new interrupts, with three maskable vectored interrupts (RST 7.5, RST 6.5 and RST 5.5), one non-maskable interrupt (TRAP), and one externally serviced interrupt (INTR). The first microprocessors were industrial controllers, says Hoff. It is a silicon chip that comprises millions of transistors and other electronic components that process millions of instructions per second. 8275-Programmable CRT Controller. In 1971, INTEL created the first microprocessor 4004 that would run at a clock speed of 108 KHz.With only 4 bits as the word size, the 4004 could only represent signed numbers in the range -8 to +7, which is indeed very small. It had about the same amount of computing power as the original ENIAC which weighed 30 tons, occupied 3,000 cubic feet of space and used 18,000 vacuum tubes. This interface with LRC 7040 Series, This page was last edited on 2 September 2020, at 19:51.

This function CRT raster scan displays. The auxiliary or half carry flag is set if a carry-over from bit 3 to bit 4 occurred. The 8085 had a long life as a controller, no doubt thanks to its built-in serial I/O and five prioritized interrupts, arguably microcontroller-like features that the Z80 CPU did not have. 257 0 obj <>stream In the Soviet Union, an 80C85 clone was developed under the designation IM1821VM85A (Russian: ИМ1821ВМ85А) which in[update] 2016 was still in production. 8085 instruction timings differ slightly from the 8080—some 8-bit operations, including INR, DCR, and the heavily used MOV r,r' instruction, are one clock cycle faster, but instructions that involve 16-bit operations, including stack operations (which increment or decrement the 16-bit SP register) generally one cycle slower. All three are masked after a normal CPU reset. In 1968, Robert Noyce and Gordon Moore were two unhappy engineers working for the Fairchild Semiconductor Company who decided to quit and create their own company at a time when many Fairchild employees were leaving to create start-ups. Due to the regular encoding of the MOV instruction (using nearly a quarter of the entire opcode space) there are redundant codes to copy a register into itself (MOV B,B, for instance), which are of little use, except for delays. These include the 8755, with an address latch, 2 KB of EPROM and 16 I/O pins, and the 8155 with 256 bytes of RAM, 22 I/O pins and a 14-bit programmable timer/counter. History of 8085 Fig: Microprocessor. The Intel 8755A-2 is the 5 MHz version. Even so, there is no need for seven different effectively identical delay instructions, and they are also identical in effect and form to the NOP instruction, except that NOP conveniently has the opcode 00 hex.

All interrupts are enabled by the EI instruction and disabled by the DI instruction.

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