CP instructions are written in a particularly user-friendly form : " SA1 A0 + B1 " denotes " set address register A1 to the sum of address register A0 and index register B1 ".
32.
CP instructions are written in a particularly user-friendly form : " SA1 A0 + B1 " denotes " set address register A1 to the sum of address register A0 and index register B1 ".
33.
The remaining control signals are self-explanatory and can be understood easily as in "'Example 1 "'where MDR is the bidirectional Memory data register and MAR is the unidirectional Memory Address Register.
34.
For example, the 14-bit address, which could access " 16 K ?8 bits of memory ", needed to be latched by some of this logic into an external Memory Address Register ( MAR ).
35.
Finding the best match for a test word " z ", involves placing " z " in the address register and finding the least distance " d " for which there is an occupied location.
36.
As with predecessor systems, the Cyber 170 series had eight 18-bit address registers ( A0 through A7 ), eight 18-bit index registers ( B0 through B7 ), and eight 60-bit operand registers ( X0 through X7 ).
37.
The machine instructions can be grouped into six categories : accumulator instructions, branch instructions, memory reference instructions, address register instructions, scratchpad register instruction, miscellaneous instructions ( interrupt, input, output, indirect scratchpad register, load, and store ).
38.
Historically, to be able to support memory address spaces larger than the native size of the internal address register would allow, early CPUs implemented a system of segmentation whereby they would store a small set of indexes to use as offsets to certain areas.
39.
Another approach ( Sch�nhage does this too ) is to declare a specific register the " indirect address register " and confine indirection relative to this register ( Schonhage's RAM0 model uses both A and N registers for indirect as well as direct instructions ).
40.
The Weitek FPUs were replaced by a floating point chipset made by Bipolar Integrated Technology and a redesigned vector processor with 32 64-bit vector elements, 8 64-bit scalar floating point registers, 8 32-bit integer registers, and 8 32-bit address registers.
