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Results tagged with x86
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The Intel x86 family of architectures in general. Contemporary systems are OFF-TOPIC! Use the specific architecture’s tag if applicable.
3
votes
x86 as a Pascal Machine?
One difference between Pascal and the C language as commonly implemented in the days before standardization is that every user-defined Pascal function will always be passed with a fixed set of argumen …
- 39.2k
3
votes
Creating 8086 binary larger than 64 KiB using NASM or any other assembler
If one can divide the program into a number of sections of 64K or less, and can assign global sequential indices to every cross-section entry point, one could produce a table in the data segment wiht …
- 39.2k
2
votes
How does the ‘real mode flat model’ work?
I've not heard the phrase "real mode flat model", but it may be referring to the fact that real mode allows a memory manager to manage memory as a linear sequence of 65,536 16-byte paragraphs (of whic …
- 39.2k
3
votes
What is the best way to set up multiple operating systems on a retro PC?
Another possibility, which would fit well with a "retro" feel, would be to find some kits that install 3.5" hard drives in carriers that then mount with a socket in a 5.25" drive bay, and have such a …
- 39.2k
6
votes
The move to protected mode on x86
A major weakness of the 80286 was the fact that most programs were limited to having two general-purpose segment registers loaded at a time. This was adequate if one wanted to copy a range of data fr …
- 39.2k
16
votes
Why does the x86 not have an instruction to obtain its instruction pointer?
So long as a stack exists, the IP address may easily be obtained via the byte sequence "E8 00 00 5B" [CALL $+3 : POP BX] because near calls use PC-relative addressing. On the other hand, the normal s …
- 39.2k
2
votes
Did any software attempt to perform 8086 emulation on the 80286 using LOADALL, in the vein o...
I don't think the engineers at Intel really understood what made real-mode 8086 segmentation so useful: it allowed memory to be allocated in 16-byte chunks, and allowed any group of up to 4096 such ch …
- 39.2k
50
votes
What does the "x" in "x86" represent?
The term x86 is shorthand for 80x86, which was used to refer to any member of the family 8086 (and also, incidently, 8088), 80186, 80286, etc. … introduced some fundamentally new ways of doing things which were shared by the 80486 as well as "named" processors like the Pentium, Pentium Pro, etc., and thus it is sometimes ambiguous whether the name "x86 …
- 39.2k
26
votes
Intel CPU bug in the 90s
Intel had a rather complex bunch of hardware to compute a floating-point quotient in a way that yielded two bits per iteration, which required having a rather large table listing all the combinations …
- 39.2k
10
votes
How to use "AND," "OR," and "XOR" modes for VGA Drawing
The 16-color modes on the VGA use a hardware design borrowed from the EGA. On the EGA (and VGA), the bitwise drawing modes don't act upon memory directly, but instead act upon values stored in four e …
- 39.2k