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CISC
RISC CPUs were an idea
of the 1980's because hardware was getting less expensive,
while coding was becoming increasingly more costly.
CISC was a term created to mean Complex Instruction
Set Computing, giving a name to the existing processor designs that
were not RISC. Today, your authors prefer CISC to mean Conventional
Instruction Set Computing.
![[spacer]](1p.gif)  RISC Verses CISC
The argument between CISC and RISC has reached religious fervor.
CISC = BAD. RISC =GOOD. Don't fall into this trap. It is an outdated thought. The RISC philosophy made a great deal of sense at the time up its inception, in the 80's. At that time, 1MB of RAM carried a cost of about $5,000.00. In 2001, current cost for 1MB of RAM is about $0.50. When RAM was that expensive, copying the micro code, from a ROM to a much faster RAM was too expensive. Today, this is a common technique used to increase the speed of a CISC based computer. The process of copying a ROM’s micro code to RAM is known as shadowing. Shadowing greatly improves performance of any CISC based CPU.
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Before beginning a deeper review
of the popular CPUs, one more thought is in order in the RISC/CSIC
debate. Today's CPUs, from any manufacturer is actually a hybrid
of the RISC/CSIC philosophy.
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