from the processor to the memory (Givone, 123).The data bus is similar to the registers located on the microprocessor but are a little bit slower to access (Givone, 123). The first 32-bit microprocessor in themicroprocessor industry that will be dis- cussed is the series 32000 family and was originally built for main-frame computers. In the 32000 family all of the differentmicroprocessors have the same 32-bit internal structure; but may have external bus values such as 8, 16, or 32 bits (Mitchell, 225). In the 32000 family themicroprocessors use only 24 of the potential 32 bit addressing space, giving the microprocessor a 16 Mbyte address space (Mitchell, 225). The 32- bit registers areset up so there are six 32-bit dedicated registers and then in combina- tion there are two 16-bit dedicated registers (Mitchell, 231). Each dedicated register has itsown type of specific information that it holds for processing (Mitchell, 232). The microprocessors oscillator (which now comes from an external source) runs at 2.5MHz, but due to a divide-by-four prescaler the clock frequency runs at 10MHz. There have been many new ideas put into practice to improve the 32000 seriesmicro- processor generally and thus making it run faster and more efficient. The next family of microprocessor which was fabricated for the microcomputer is theMC68020 32-bit microprocessor which is based on the MC68000 family. The other microprocessors that are included in this family are the MC68000, MC68008,MC68010 and the MC68012 (Avtar, 302). Before going into the types of components that this microprocessor contains, it should first be know that the making ofthe MC68020 has been the product of 60 man-years of designing including the manufac- turing of the High-density Complementary Metal Oxide Semiconductorgiving the mi- croprocessor high speed and low resistance and heat loss (Avtar, 302). Because of all the work that was put into the MC68020 and its other relatedmicroproces...
