Timeline for How did DOS know where to load itself in upper memory?
Current License: CC BY-SA 4.0
11 events
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| S Nov 29, 2019 at 15:48 | history | edited | Raffzahn | CC BY-SA 4.0 |
mention HMA abbreviation, correct highmem.sys -> himem.sys, mention emm386.exe, activity typo, spell out "of course", seem typo, they typo, on -> of, you -> your, allows typo
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| S Nov 29, 2019 at 15:48 | history | suggested | ecm | CC BY-SA 4.0 |
mention HMA abbreviation, correct highmem.sys -> himem.sys, mention emm386.exe, activity typo, spell out "of course", seem typo, they typo, on -> of, you -> your, allows typo
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| Nov 29, 2019 at 15:46 | review | Suggested edits | |||
| S Nov 29, 2019 at 15:48 | |||||
| Mar 15, 2018 at 9:17 | comment | added | Jules | @Trap - crashing while running from display memory may deserve it's own question, but a relevant factor is what kind of system and what kind of display hardware do you have? If you have a 16-bit bus and an 8-bit graphics card or a 32-bit bus and a 16-bit graphics card, it could be that the processor is only getting half of a memory fetch fulfilled and that's causing it to execute junk instructions (likely 0xFFFF, which I think is an invalid opcode, so should cause a trap on 286 or above). | |
| Mar 15, 2018 at 6:26 | comment | added | No'am Newman | From what I remember, accessing memory in a video card is much slower than accessing regular memory - Michael Abrash wrote about this somewhere. | |
| Mar 14, 2018 at 1:41 | comment | added | Raffzahn | For one, does your machine have memory there? And second, do not use the memory of the active display, as already the scrolling when pressing enter wil ldetroy your programm. | |
| Mar 13, 2018 at 22:52 | comment | added | Trap | I tried to run some code from video display memory (B800h or A000h) and it crashed the computer right after the first instruction. | |
| Mar 13, 2018 at 22:49 | comment | added | Raffzahn | Sure, DOS loads the drivers and then uses whatever they provide. | |
| Mar 13, 2018 at 22:45 | comment | added | Trap | Isn't DOS the one that load drivers? In BIOS world there does not exist such a thing as a file | |
| Mar 13, 2018 at 20:25 | history | edited | Raffzahn | CC BY-SA 3.0 |
added 727 characters in body
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| Mar 13, 2018 at 20:16 | history | answered | Raffzahn | CC BY-SA 3.0 |