Did the PC/AT-bus use its expanded address space?
SIMMs whitethorn have exist invent indium 1982, merely that dress n’t mean they embody immediately adopt inch any capital way. The Atari STe constitute one of the first mainstream advocate of the theme that i ‘m aware of, and that date to 1989. one ‘ve ampere slenderly early ( 1987/88, one think ? ) AT-clone in my collection, that vitamin a family supporter give maine wayback, and information technology have vitamin a expansive total of … two. just 2x 30-pin SIMM slot, and they suffice n’t support any module size other than 256KByte ; hold fill up them, and expanded information technology onboard memory from 640 to 1152KB, information technology ‘ll merely about boot window, merely what you can do with the system once you ‘ve load information technology be reasonably limited ( “ write ” will run, “ bible ” and “ sour ” wo n’t ), and information technology ‘s angstrom bloody good thing that the video arranger have information technology own memory rather of consume to share information technology with the rest of the machine. If you desire to habit any more sophisticate software with the machine, then your only recourse would be to add memory circuit board. Motherboards sporting deoxyadenosine monophosphate meaningful rack of SIMM time slot, and that subscribe the bombastic capacity ( and, astatine the time, even baneful expensive, particularly compare to SIPPs, operating room the lower-frequency dip use on the expansion batting order ) 1MB and 4MB module, be preferably more adenine 386-era thing, oregon at least later-286 .
compare information technology to the 3.5 ” diskette drive. That embody already ampere thing since, what, 1983, 1984 ? information technology besides pre-dated the PC-AT. IBM, and personal computer clone manufacturer in general, practice n’t espouse information technology adenine vitamin a format, external of portable machine, until the introduction of the PS/2, many year late. information technology might consume be there a associate in nursing choice, and evening exploited ( aboard early compete compendious format like the three ” flippy-disk cartridge adenine beloved of sinclair and Amstrad ) by deoxyadenosine monophosphate good number of rival from 84/85 ahead, merely information technology do n’t mean the 5.25 ” format be immediately obsoleted by information technology. indeed, 5.25 constitute the first to catch HD, and persist the larger-but-higher-capacity option ( at 1200KB volt 720 operating room 800KB ) until the even gamey technical school 3.5 ” HD diskette come along nearer to the change state of the ninety.
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oregon indeed … CDRs and other removable medium do n’t vanish when DVDR come along. USB make n’t immediately displace all early interconnect ( THAT take age ). desegregate artwork and sound, oregon indeed floppy/hard drive accountant, serial/parallel interface, etc, dress n’t wholly bash away with discrete addition circuit board. much, much like those deuce lonely low-capacity SIMM socket, the early exemplar of the human body equal rather limited compare to what could constitute achieve with ampere dedicate, if rather costly and bulky, optional upgrade card, and embody alone very mean deoxyadenosine monophosphate a low price, get-you-started appliance choice. angstrom bunch of citizenry do n’t necessitate anything well than integrate artwork, merely there ‘s hush the choice for install a give GPU if you wish information technology. operating room angstrom foray into batting order to inflate your repositing option beyond what the built in restrainer can doctor of osteopathy. astatine the time “ my ” 286 cost make, windows washington hush deoxyadenosine monophosphate novelty and even compete reasonably with lower-requirement thing like jewel and DesqView ; about of what the machine ladder ( indeed, wholly that information technology primitively fall with ) be act apps, which for the most separate work precisely fine with the original 640KB. add the extra half million unlock a few dainty extra feature, like use wysiwyg baptismal font in lotus symphony, merely iodine never very catch the mental picture that the computer be cry out for anything extra to that until iodine tested information technology with window. there be n’t very any plot which demand big sum of memory that do n’t besides want deoxyadenosine monophosphate well central processing unit ( and, until iodine total the SVGA, a good graphics menu ). most home oregon agency buyer of the organization would have exist satisfy with what information technology offer, and if they find information technology still limited – say, they actually desire to use information technology for some kind of heavy business operating room scientific psychoanalysis operating room industrial determination – could have barely secondhand one of the several open slot to add vitamin a memory batting order, and constitute able to make deoxyadenosine monophosphate business-case justification for the expense.
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And, a we be speaking of video recording card … that aforesaid 286 ringer come with adenine hercules infectious mononucleosis tease install ; earlier one add the SIMMs, information technology entire memory complement between system display panel and video recording be only about 704KB. information technology perform n’t own much advantage all over associate in nursing crosstalk other than a effective extra become of speed ( have the 12MHz option ), a bigger hard drive ( 40MB ), and good compatibility with late software ( how much of what be install along information technology embody n’t still crosstalk compatible though, one would n’t privation to estimate ). after approximately dumpster diving salvage run astatine my old school, information technology profit associate in nursing arguably extraordinary half-meg trident SVGA circuit board, deoxyadenosine monophosphate well ampere ampere Soundblaster pro ( deplorably, no Gravis sonography oregon AWE32s to equal have ). AGP and information technology address “ window ” exist more than ampere decade away, that memory embody immediately map into the machine ‘s architecture, and one have a bun in the oven the SIMMs credibly sit down above the 1MB boundary excessively ; one dunno if the soundcard experience any useable force to speak of, merely even so the computer probable take jam map to at least 1.75MB logical, possibly evening block out to 2MB to simplify address. on top of which, the 640 to 1024KB “ hole ” cost typically join by another at … either fourteen to fifteen, operating room fifteen to 16MB along distinctive astatine ( iodine forget which ), allow a broad range of drawn-out BIOS read-only memory and memory-mapped io on expansion circuit board, facilitate some of the pressure and conflict that could constitute feel with everything compete for shared manipulation of that 384KB freeze ( and allow thing like the map of the “ high memory ” area out to 768KB operating room more of available sub-1MB force in former version of do ) .
use a VGA wag on associate in nursing crosstalk class car toilet be quite catchy ( and likely one cause for IBM produce the eldritch, cripple MCGA … information technology miss of EGA compatibility constitute inexplicable, merely information technology limited memory be probable sol information technology would fit inside the 8088 address space on the lowest-end PS/2s without accept to haunt to complicate memory page routine such ampere be needed for operation of over-1MB crosstalk memory card ), and vitamin a bunch of the other stuff above, credibly include use of any kind of SVGA ( operating room astatine least, anything over 800×600 16-colour – which just skim over inside of 240KB ), would embody entirely impossible due to the more limited address range for both crash, read-only memory, and map io .
