Intel 80186
 |
An Intel 80186 Microprocessor |
The
80186 is a
microprocessor that was developed by
Intel circa
1982. The 80186 was an improvement on the
Intel 8086 and
Intel 8088. As with the 8086, it had a
16-bit external bus and was also available as the
Intel 80188, with an
8-bit external
data bus. The initial clock rate of the 80186 and 80188 was 6
MHz. They were generally used as
embedded processors (roughly comparable to
microcontrollers). They were not used in many
personal computers, but there were some notable exceptions: the
Mindset, the
Siemens PC-D (the first DOS PC line of Siemens, with MSDOS v2.11), the
Compis (a
Swedish school computer), the
RM Nimbus (a British school computer), the
Unisys ICON (a Canadian school computer), the HP 200lx, the
Tandy 2000 desktop (a somewhat PC-compatible workstation featuring particularly sharp graphics for its day) and the Philips :YES. Acorn (another British computer manufacturer) also created a plugin Second Processor that contained the 80186 chip along with assorted support chips and 512k of RAM - hence the Master 512 system.
One major function of the 80186/80188 series was to reduce the number of chips required by including features such as a
DMA controller, interrupt controller, timers, and
chip select logic.
New instructions were introduced as follows:
ENTER Make stack frame for procedure parameters
LEAVE High-level procedure exit
PUSHA Push all general registers
POPA Pop all general registers
BOUND Check array index against bounds
UD2 Generate invalid opcode exception
INS Input from port to string
OUTS Output string to port
*
Intel 80186/80188 images and descriptions at cpu-collection.de
