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Now we can prepare to list the fetched colors by displaying a message Here are the fetched colors: in the target <div> element; we ll also start an unordered list with a <ul> HTML tag so the colors appear in a bulleted list:

The first PCs could access only 1MB of memory, which was sufficient for most of the applications of that time However, technology improved and the 1MB limit became a hindrance as applications were developed that required more than the allotted memory

space Several memory management utilities were developed to allow these older computers to access more memory, and some of these utilities are still used today These files, as well as their common implementations, are described here

function getData(dataSource, divID) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); var obj = documentgetElementById(divID); XMLHttpRequestObjectonreadystatechange = function()

Conventional Memory The first 640KB of RAM have traditionally been used for running applications and the OS itself (DOS) This memory area was originally called system memory The term system memory now refers to all the memory available in the system Upper Memory The remaining 384KB of memory were set aside (reserved) for ROM BIOS, and the RAM and ROM that was installed on devices Applications could not access this memory space even if it wasn t being entirely used by the system This memory space was initially termed reserved memory It was very common for devices such as video adapters to use a portion of this memory for its purposes Extended and High Memory When the Lotus 1-2-3 spreadsheet application was released, users often found that it required more than 640KB of memory To resolve the 1MB memory barrier problem, Lotus, Intel, and Microsoft joined forces and developed the LIM memory specification In this specification, system memory was renamed conventional memory and reserved memory was renamed upper memory More important, however, was the development of a memory manager that allowed applications to use memory over 1MB (called extended memory) This manager, a file called HIMEMSYS, could also load the OS into the first 64KB of extended memory, an area called the high memory area (HMA) To use the extended memory specification (XMS), HIMEMSYS must be referenced in the CONFIGSYS file, as shown here:

3:

The first line instructs the computer to locate and initialize the HIMEMSYS file, thus enabling the extended memory area The second line loads DOS into the high memory area (HMA)

if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; colors = xmlDocumentgetElementsByTagName("color"); objinnerHTML = "Here are the fetched colors:<ul>"; } } } }

Expanded Memory At the time of the LIM specification release, many users still had older Intel 8088 and 80286 computers, which, because of the small memory address bus, could not be made to access memory over 1MB For these individuals, the LIM specification included an expanded memory manager that could trick the processor into using extended memory In the 80386 processor, a file called EMM386 EXE is able to swap pages of memory between extended memory and upper memory

Now we can loop over the colors array to extract the three colors:

8:

function getData(dataSource, divID) { if(XMLHttpRequestObject) { XMLHttpRequestObjectopen("GET", dataSource); var obj = documentgetElementById(divID); XMLHttpRequestObjectonreadystatechange = function() { if (XMLHttpRequestObjectreadyState == 4 && XMLHttpRequestObjectstatus == 200) { var xmlDocument = XMLHttpRequestObjectresponseXML; colors = xmlDocumentgetElementsByTagName("color"); objinnerHTML = "Here are the fetched colors:<ul>"; for (loopIndex =0; loopIndex < colorslength; loopIndex++) { } } } } }

In other words, when the processor requests data that is located in extended memory, EMM386EXE retrieves the information and then places it in upper memory, which is accessible to the processor This process is also known as paging The EMM386 file will not work unless the HIMEMSYS file is loaded EMM386EXE also enables programs to use upper memory as system memory In other words, upper memory is no longer reserved for device drivers; it can be accessed by regular applications To enable the expanded memory specification (EMS), the EMM386EXE file must be referenced in CONFIGSYS, as shown here: