On Wed, 18 Jan 2006 17:25:20 -0000, you wrote: >Not quite - > >The DOS managed, and used memory area was the first 640KB > >The area above that required access & management that was not part of the >basic DOS software; >but it could be accessed as extended memory, Expanded memory, and later by >routines loaded from the pre-'command.com' loaded routines ( as specified in >Config.sys, and later autoexec.bat) dos using the memory management facility >associated with 'Highmem'
UK terminology creeping in here the actual prog was called "Himem" Hugh > >JimB > >----- Original Message ----- >From: "Slattery, Tim - BLS" <[EMAIL PROTECTED]> >To: <[email protected]> >Sent: Wednesday, January 18, 2006 5:25 PM >Subject: Re: Brief History of IBM PCs (WAS RE: Mobo caps - again!) > > >> So why wasn't the 86 capable of accessing 1Mb ram > >It was. The 8086 had a 20-bit address space, which means that it could >handle 1MB of RAM. DOS reserved the top 360KB of that for the OS. The >lower 640KB was available to user programs. > >-- >Tim Slattery >[EMAIL PROTECTED] > >-- > ---------------------------------------- >To unsubscribe, mailto: [EMAIL PROTECTED] >Is your picture included in the Official Win-Home List Members Profiles >Page? > http://www.besteffort.com/winhome/Profiles.html >If not, write to: [EMAIL PROTECTED] Sir Hugh of Bognor -- Remember. You may honestly belive that you understood everything you thought I said but what you thought you heard wasn't exactly what I said. [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] -- ---------------------------------------- To unsubscribe, mailto: [EMAIL PROTECTED] Is your picture included in the Official Win-Home List Members Profiles Page? http://www.besteffort.com/winhome/Profiles.html If not, write to: [EMAIL PROTECTED]
