Around 200,0 PCs left the factory with this defective chip. Usually an interrupt is not allowed until the instruction after the one that changed the stack segment register. Intel offered a lower price to IBM for the 8088 than the 8086.Įarly Intel 8088s were manufactured with an interrupt bug, which meant the CPU allowed interrupts to occur after a program changed the stack segment register. This is one reason why IBM chose the Intel 8088 for its new IBM 5150 computer, coupled with the fact they had already acquired the rights to manufacture the 8086 family of CPUs. This was crucial at the time because 8-bit support chips were much cheaper to buy than 16-bit chips, and there was more choice for manufacturers. One of the primary reasons for the creation of the 8088 was to add compatibility with the 8080/8085 CPU, so that it would be easy and cheap for new 8088-based computers to make use of the tried and trusted support chips already in use by manufacturers who had knowledge of the 80. Both CPUs have an identical Execution Unit (EU) - only the Bus Interface Unit (BIU) and the prefetch queue differ (reduced to 4 bytes in the 8088 from the 8086's 6 bytes). This means the 8088 required two consecutive bus cycles to read/write 16-bit data instead of one bus cycle for the 8086, making it slower than the 8086 in performing 16-bit tasks. In 1979, a year after the 8086, the 8088 was launched, It was pin-compatible with its older sibling, and had the same architecture internally with the only difference being a narrower external data bus width on the 8088 (8-bit instead the 8086's 16-bit).
#8088 5MHZ MEMORY SPEED NS MANUAL#
Programming: iAPX 86/88/186/188 Programmers Reference Manual (1983) The 8086 was available in both ceramic (D) and plastic (P) packages.Īn 8086 cannot be replaced with an 8088 due to the differences in data bus width (16-bit vs 8-bit). The table below shows the MIPS rating for the more common CPU speeds: MHz Compatible and in some cases enhanced versions were also manufactured by Fujitsu, Harris/Intersil, OKI, Siemens AG, Texas Instruments, NEC, Mitsubishi, and AMD. The typical unit price of the 8086 was around $200 in 1980. Originally limited to 5 MHz clock speeds with the first variant (8086), later variants (8086-2) were specified to run at up to 10 MHz. Manufacturers like Cyrix (8087-compatible) and Weitek ( non 8087-compatible) eventually came up with high performance floating point coprocessors that competed with the 8087 as well as with the subsequent, higher performing Intel 80387. The Intel 8087 was the standard math coprocessor for the 80, operating on 80-bit numbers.
The 80 could be used in tandem with a mathematical coprocessor to add hardware/microcode-based floating point performance. Both internal and external data bus are 16-bits wide, and the 8086 could address up to 1 MB of memory, in 64 KB segments and changing the segment register to look at further 64 KB segments. It was created using Intel's new HMOS manufacturing process (High Performance MOS) which was setup to create fast static RAM products. It added new instructions to support signed integers, base+offset addressing, and self-repeating operations. Launched after Intel's success with its much earlier 8080 microprocessor, the 8086 was designed to permit assembly language for the 80 to be converted to equivalent 8086 source code. Intel Celeron / Pentium III, AMD K6-3, VIA C3
#8088 5MHZ MEMORY SPEED NS PRO#
Intel Pentium Pro / Pentium II, AMD K6/ K6-2 Intel Pentium (classic), Cyrix 6x86, AMD K5, Intel Pentium Overdrive
To help simplify the huge array of CPUs over the years, they are sometimes put into "generations", like in the table below. In some cases there were clones or licenced variants - details of these can be found in the relevant section. This page takes a look at all the major CPUs used in PCs from 1982 through to 2000. Until the 3D gaming era, the CPU was what defined the perfomance of your computer.
#8088 5MHZ MEMORY SPEED NS PC#
One of the most critical components of a PC is the Central Processing Unit (CPU).
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