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Intel 80186




The 80186 is a , 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, and the Tandy 2000 desktop (a somewhat PC-compatible workstation featuring particularly sharp graphics for its day). 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
IMUL Signed (integer) multiply
INS Input from port to string
OUTS Output string to port


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