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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.
An earlier chipset support for Intel 8085 microprocessor can be found at MCS-85 family section. Early IBM XT-compatible mainboards did not yet have a chipset, but relied instead on a collection of discrete TTL chips by Intel: [1] the 8284 clock generator; the 8288 bus controller; the 8254 programmable interval timer; the 8255 parallel I/O interface
These techniques can enhance the area-economy considerably although the effect on the speed is complex. Processors built with depletion-load NMOS circuitry include the 6800 (in later versions [16]), the 6502, Signetics 2650, 8085, 6809, 8086, Z8000, NS32016, and many others (whether or not the HMOS processors below are included, as special cases).
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.
The Intel 8085 CPU used a 6.144 MHz crystal, resulting in the processor operating at 3.072 MHz. The basic system had 256 bytes of RAM and 2048 bytes of ROM.The base system also had cassette tape IO, serial IO which could be configured for RS-232 or current loop, and thirty eight bits of parallel IO.
Zilog was later producing a low-power Z80 suitable for the growing laptop computer market of the early 1980s. Intel produced a CMOS 8085 (80C85) used in battery-powered portable computers, such as the Kyocera-designed laptop from April 1983, also sold by Tandy (as TRS-80 Model 100), Olivetti, and NEC.
The 8259 may be configured to work with an 8080/8085 or an 8086/8088. On the 8086/8088, the interrupt controller will provide an interrupt number on the data bus when an interrupt occurs. The interrupt cycle of the 8080/8085 will issue three bytes on the data bus (corresponding to a CALL instruction in the 8080/8085 instruction set).
IMSAI VDP-40 desktop computer of 1977-1979. Intel 8085, 32/64KB RAM, 2× FDD 80/160KB, S-100 bus. 2KB monitor ROM, 2KB Video ROM. The IMSAI 8080 is an early microcomputer released in late 1975, based on the Intel 8080 (and later 8085) and S-100 bus. [1] It is a clone of its main competitor, the earlier MITS Altair 8800. The IMSAI is largely ...