AEDIT-86 Variables

AEDIT-86 User's Guide

NXTCH ASCII value of the next character.

NXTTAB The column number of the next (Le., to the right of the cursor) tab position as defined by SET Tab. If there are no tabs to the right of the

 

cursor in the current line, the value of NXTTAB is zero.

NXTWD

ASCII value of the second and third bytes following the current cursor

 

location.

ROW

Current cursor row (actual row, not the logical line in the text).

UPCH

If the current character is a lowercase character (61 H to 7AH), UPCH

 

is the ASCII value of the uppercase character. Otherwise, UPCH is

 

the same as CURCH.

The following values are offset from the beginning of the currently processed input file. Note that these variables count the carriage return/line feed pair as two charac- ters, whereas AEDIT-86 usualJy counts the carriage return/line feed pair as one character. If the file is edited using the FORWARDONL Y control, the offset is from the current beginning of text. This position may vary as the cursor is moved forward.

CURPOS

Offset of current location in file. CURPOS is zero for the first charac-

 

ter of the file.

TAGA

Offset of tag A.

TAGB

Offset of tag B.

TAGC

Offset of tag C.

TAGD

Offset of tag D.

The following values relate to the S-variables:

SLO-SL9

SLx

Relates to the S-variables SO-S9. Each variable contains the length of the corresponding global read-write S-variable.

Relates to the S-variables, Sx, where x is the second letter in one of the global read-only variable names (e.g., B, E, G). Each variable contains the length of the corresponding global read-only S-variable.

The following is an alphabetic list of counters that contain the actual number of command repetitions from the last time the command was specified with count greater than one. The CNT prefix signifies COUNT.

CNTEXE The number of times the macro that is currently executing has executed in the current activation. The first execution is number one. If none, the value is zero.

CNTFND Relates to (-)FIND.

CNTMAC The number of times that the last macro (which has finished execut- ing) was executed.

CNTREP Relates to (?)REPLACE.

6-4

Page 90
Image 90
Intel AEDIT-86 manual Nxtwd, Row, Upch, Curpos, Taga, Tagb, Tagc, Tagd, SLO-SL9

AEDIT-86 specifications

The Intel AEDIT-86, also known as the Intel 8086, is a notable microprocessor that played a critical role in shaping the computing landscape. Released in 1978, it was Intel's first 16-bit microprocessor, setting the stage for the x86 architecture that continues to influence modern computing.

One of the main features of the AEDIT-86 is its 16-bit architecture, which allows it to process data in larger chunks compared to its 8-bit predecessors. This capability not only improves performance but also increases the amount of memory that can be addressed, allowing for a maximum of 1 MB of RAM. This was a significant advancement at the time, enabling more complex software and operating systems to run efficiently.

The AEDIT-86 is built on a 3-micron process technology, which was innovative for its time and contributed to its performance capabilities. The microprocessor operates at a clock speed of up to 5 MHz, which allowed it to execute more instructions per second than previous generations of processors. This speed, combined with its wide data bus (16 bits), enables the processor to handle a larger volume of information more quickly.

Intel incorporated several key technologies in the AEDIT-86, including segmentation. This feature divides the memory into different segments, making it easier for programs to access data and improving memory management. The AEDIT-86 also supports a minimum of four 64 KB segments, which enhances the organization and access of programs and data in memory.

Another significant aspect of the AEDIT-86 is its compatibility with the existing 8080 and 8085 instruction sets, which facilitated easier migration for developers and helped the processor gain traction in the market. This backward compatibility allowed existing software to be ported to the new platform with minimal modification.

Furthermore, the Intel AEDIT-86 introduced a powerful instruction set that includes both integer and string manipulation commands, paving the way for more versatile programming. The instruction set architecture (ISA) of the AEDIT-86 supports both high-level programming languages and low-level assembly language, offering flexibility for various applications.

In summary, the Intel AEDIT-86 is a groundbreaking microprocessor known for its 16-bit architecture, advanced segmentation technology, and compatibility with earlier instruction sets. Its introduction marked the beginning of the x86 architecture, which has influenced countless processors and computing systems that followed. The AEDIT-86's features and technologies were instrumental in the evolution of personal computing, laying the groundwork for future innovations in the industry.