Epson Apex 386/40 Canadian Product User Manual - Page 102

Technical Information, 386 Microprocessor, Math Coprocessor

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6-2 Technical lnformation 386 Microprocessor The mainboard uses a 386-33/40 microprocessor running at 33/40MHz. The 386 is a high-performance 32-bit microprocessor designed for multitasking operating systems. The processor can address up to 4 gigabytes of physical memory and 64 terabytes of virtual memory. lt incorporates integrated memory management and protection in its architecture in the form of address-translation registers, advanced multitasking hardware, and a protect mechanism to support operating systems. In addition, its object code is compatible with the Intel 8086 family of microprocessors. The 386 has built-in features to support coprocessors, DMA and interrupts (both maskable and non-maskable). It has two modes of operation: real address mode and protected virtual address mode. In real address mode, the 386 operates as a fast 8086 with a 32bit extension if necessary. The protected virtual address mode is the natural environment of the 386. Software can perform a task switch into tasks designated as virtual 8088 mode tasks. Virtual 8086 tasks can be isolated and protected from one another by use of paging and I/O-permission bit mapping. Math Coprocessor The mainboard supports the 80387 and the Weitek 3167 numeric coprocessors to accelerate processing of calculation-intensive tasks. Chapter 6: Appendix 9

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6-2 Technical lnformation
386
Microprocessor
The mainboard uses a 386-33/40 microprocessor running at
33/40MHz.
The 386 is a high-performance 32-bit microprocessor designed for
multitasking operating systems. The processor can address up to 4
gigabytes of physical memory and 64 terabytes of virtual memory.
lt incorporates integrated memory management and protection in its
architecture in the form of address-translation registers, advanced
multitasking hardware, and a protect mechanism to support operating
systems. In addition, its object code is compatible with the Intel 8086
family of microprocessors.
The 386 has built-in features to support coprocessors, DMA and
interrupts (both maskable and non-maskable). It has two modes of
operation: real address mode and protected virtual address mode.
In real address mode, the 386 operates as a fast 8086 with a 32bit
extension if necessary. The protected virtual address mode is the
natural environment of the 386. Software can perform a task switch into
tasks designated as virtual 8088 mode tasks. Virtual 8086 tasks can
be isolated and protected from one another by use of paging and
I/O-permission bit mapping.
Math Coprocessor
The mainboard supports the 80387 and the Weitek 3167 numeric
coprocessors to accelerate processing of calculation-intensive tasks.
Chapter 6: Appendix
9