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Mastering DOS Memory, Part 2: 960K Conventional Memory for DOS!
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DOS and the 640K Memory Barrier!
Though actually, there was no such barrier, if it were not for the original PC BIOS implementation.
Using some trickery it's possible to have more than 640K, way more, upto 960K.
Upper Memory Blocks, you say? Nah, that works only on 386 or better CPUs.
This video explains a long lost technique how to make use of the upper memory, end redicate it as conventional memory on 8086/8088 and machines.
And pushing the bar even further, on 286, you can combine that with the HMA, to have even more free conventional memory.
00:00 Intro
00:38 The Theory: Bumping DOS beyond 640K
06:08 About PCs with more than 640K real memory
08:03 CONFRAM revisited: Making it work!
15:18 Pushing the RAM limit to 960K
19:25 Compatible with DR DOS?
19:52 Conclusion / Outro
Links:
CONFRAM and JENSEITS (BEYOND), by c't:
c‘t 5'88, p164
c‘t 11‘88, P140
Classic Computing Forum (german):
TPC's Github Project for "BEYOND":
Technical References:
PCs without 640k barrier:
Tim Paterson on DOS limit:
Computer Chronicles: Losing Memory (1995)
Copyright @ 2024 THE PHINTAGE COLLECTOR, Gianpaolo Del Matto. All rights reserved.
Featuring Music with kind permission by rootkitty: "Digital Aurora"
Theme Music composed by Abdallah El-Ghannam.
Though actually, there was no such barrier, if it were not for the original PC BIOS implementation.
Using some trickery it's possible to have more than 640K, way more, upto 960K.
Upper Memory Blocks, you say? Nah, that works only on 386 or better CPUs.
This video explains a long lost technique how to make use of the upper memory, end redicate it as conventional memory on 8086/8088 and machines.
And pushing the bar even further, on 286, you can combine that with the HMA, to have even more free conventional memory.
00:00 Intro
00:38 The Theory: Bumping DOS beyond 640K
06:08 About PCs with more than 640K real memory
08:03 CONFRAM revisited: Making it work!
15:18 Pushing the RAM limit to 960K
19:25 Compatible with DR DOS?
19:52 Conclusion / Outro
Links:
CONFRAM and JENSEITS (BEYOND), by c't:
c‘t 5'88, p164
c‘t 11‘88, P140
Classic Computing Forum (german):
TPC's Github Project for "BEYOND":
Technical References:
PCs without 640k barrier:
Tim Paterson on DOS limit:
Computer Chronicles: Losing Memory (1995)
Copyright @ 2024 THE PHINTAGE COLLECTOR, Gianpaolo Del Matto. All rights reserved.
Featuring Music with kind permission by rootkitty: "Digital Aurora"
Theme Music composed by Abdallah El-Ghannam.
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