help i need help!!!

nigs42 · 06-20-2006, 11:26 PM

hello my name is steven i was just wondering could you please help me i have deleted some files off my laptop my laptop is a windows 95 and it is a toshiba and now when i start it up it says warning:the high memory area (HMA) is not available additonial low memory (below 640k ) will be used insted C:/ if anyone can help me lease i need the help please e-mail me on bobrulestheworld@hotmail.com

ctiger2 · 06-21-2006, 02:14 PM

I assume you read Wiki:

Quote:

The High Memory Area (HMA) is the RAM area consisting of the first 64 kilobytes (KB), minus 16 bytes, of the extended memory on an IBM PC or compatible microcomputer.

By a strange design glitch the Intel 80286 and subsequent processors can actually address 17×64 KB minus 16 bytes of memory (from 0000:0000 to FFFF:FFFF (equivalent to the memory address FFFF0 + FFFF = 10FFEF), written in PC memory segment notation with hexadecimal numbers) in real mode. In the Intel 8086 and Intel 8088 processors, unable to handle more than 1 megabyte of memory, addressing wrapped around, that is, address FFFF:0010 was equivalent to 0000:0000.

In order to allow running existing MS-DOS programs which relied on this feature on their newer IBM PC AT computers, IBM added special circuitry on the motherboard to simulate the wrapping around. This circuit was a simple logic gate which could disconnect the microprocessor's addressing line A20 from the rest of the motherboard. This gate could be controlled, initially through the keyboard controller, to allow running programs which wanted to access the entire RAM.

So-called A20 handlers could control the addressing mode dynamically, thereby allowing programs to load themselves into the 1024–1088 KB region and run in real mode. The first user of the HMA among Microsoft products was Windows/286 2.1 in 1988, which introduced the HIMEM.SYS device driver. Starting with versions 5.0 of DR-DOS (1990) and of MS-DOS (1991), parts of the operating system could be loaded into HMA as well, freeing up to 46 KB of conventional memory. Other components, such as device drivers and TSRs, could be loaded into the Upper Memory Area.

Did you try restoring the files from the CD-ROM?

06-20-2006, 11:26 PM	#1 (permalink)
nigs42 Registered User Join Date: Jun 2006 Posts: 1 OS: win95	help i need help!!! hello my name is steven i was just wondering could you please help me i have deleted some files off my laptop my laptop is a windows 95 and it is a toshiba and now when i start it up it says warning:the high memory area (HMA) is not available additonial low memory (below 640k ) will be used insted C:/ if anyone can help me lease i need the help please e-mail me on bobrulestheworld@hotmail.com