Intel 80188

Intel 80188 Central processing unit
Produced:	From 1980 to 1982
Manufacturer:	Intel
CPU speeds:	8 MHz to 10 MHz
Instruction set:	x86
Cores:	1
Socket:	68-pin socket

The Intel 80188 is a version of the Intel 80186 microprocessor with an 8 bit external data bus, instead of 16 bit. This makes it less expensive to connect to peripherals. Since the 80188 is very similar to the 80186, it had a throughput of 1 million instructions per second. [1]

As the 8086, the 80188 featured four 16-bit general registers, which could also be accessed as eight 8-bit registers. It also included six more 16-bit registers, which included, for example, the stack pointer, the instruction pointer, index registers, or a status word register that acted like a flag, for example, in comparison operations.

Just like the 8086, the processor also included four 16-bit segment registers that enabled the addressing of more than 64 KiB of memory, which is the limit of a 16-bit architecture, by introducing an offset value that was added, after being shifted left 4 bits, to the value of another register. This addressing system provided a total of 1 MiB of addressable memory, a value that, at the time, was considered to be very far away from the total memory a computer would ever need.

External links

• Intel 80186/80188 images and descriptions at cpu-collection.de
• Scan of the Intel 80188 data book at datasheetarchive.com

This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL.

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