Só Precisamos de 640 kB de Memória? | 16-bits até 64-bits!
Um dia nos disseram que 640 kilobytes de RAM é o suficiente pra tudo que a gente precisasse. Isso foi no começo dos anos 80. Hoje quero mostrar como a gente lidava com essa limitação no MS-DOS, como era na geração anterior e como ficou na transição pra 32-bits, depois pra 64-bits, e porque isso é relevante pra você, como programador.
Hoje vamos ter História!
Errata:
12:03 - eu falei 2 mega mas era 4 giga!
Conteúdo:
00:00 - Intro
01:25 - Recapitulando Mappers de 6502
08:48 - MS-DOS
12:13 - Segmento:Offset = 20 bits
18:50 - HMA, UMB, EMS, XMS
23:31 - Config.sys
27:51 - modo protegido e virtualização
31:26 - AWE/PAE
32:17 - swap/page faults
38:42 - 64-bits
41:26 - NX Bit/DEP
47:25 - Conclusão
Links:
Tutorial of ARM Stack Overflow Exploit – Defeating ASLR with ret2plt (https://www.fortinet.com/blog/threat-...)
How do ASLR and DEP work? (https://security.stackexchange.com/qu...)
Memory Prices 1957+ (https://jcmit.net/memoryprice.htm)
Mastering x86 Memory Segmentation (https://www.eejournal.com/article/mas...)
Configuring your MS-DOS properly (https://www.cubic.org/docs/configurin...)
Autoexec.bat and config.sys information (https://www.computerhope.com/ac.htm)
4DOS Introduction and Installation Guide (https://wiki.preterhuman.net/4DOS_Int...)
The GRUB MBR (https://thestarman.pcministry.com/asm...)
NES EMULATION (https://people.ece.cornell.edu/land/c...)
6502 Instruction Set (https://www.masswerk.at/6502/6502_ins...)
ROMs and Mappers: Why NES Games Can Be So Different On The Same Hardware (https://abad1dea.tumblr.com/post/1874...)
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Podcasts (https://anchor.fm/akitando)
Transcript: https://www.akitaonrails.com/2021/05/...
Podcast: https://anchor.fm/akitando/episodes/A...
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