Questions tagged [80486]

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45
votes
2answers
10k views

Why does the 80486 take longer to execute simple instructions than complex ones?

The 80486 processor can execute many instructions in a single cycle, such as a register-to-register add instruction (ADD EAX, EBX, for example), which one would generally assume is fairly complex, ...
20
votes
2answers
6k views

Why did Socket 3 have more pins than needed for the 486?

Intel's Socket 3, used for 486 processors, was a 19×19 pin grid array socket. However, all compatible processors, to my knowledge, used 17×17 PGA packages. What was the point of the extra pins around ...
18
votes
2answers
3k views

How did AMD's 386 and 486 perform like Intel's newer generation?

AMD really started to come into its own as a competitor to Intel around the time of the Intel 80486 introduction. AMD countered Intel by shipping the popular (at least with PC enthusiasts) Am386-40, ...
15
votes
1answer
900 views

Were there 486SX revisions without an FPU on the die?

I know that the 486SX had its FPU disabled, maybe by binning 486 CPUs into those with and without functioning FPUs. But did Intel eventually make a 486SX revision without an FPU on the die?
9
votes
2answers
551 views

What year was my old, long-lost IBM PC born? And which form factor/model was it?

I've spent a ridiculous amount of time and effort over the years just trying to figure out what exact IBM product I grew up with. At last, I've finally established for 100% certain that it was a: IBM ...
4
votes
3answers
545 views

Bad floppy drive in T1910CS 486 laptop

I've recently picked up a Toshiba T1910CS 486 laptop. It's in OK shape, with a 500MB hard drive and DOS installed. I also ordered a USB floppy disk drive and some floppy disks so that I could install ...
2
votes
3answers
231 views

Where to find a Toshiba T1900, T1910,T1950,T1960 laptop fdd drive cable, non standard 26 pin flex flat cable (ffc)?

I was trying to take apart a Toshiba T1950ct laptop to replace slim floppy drive:s belt. Unfortunately, I broke the delicate flat flex cable (ffc) which is non standard 26 pin floppy cable. ...
0
votes
2answers
446 views

How do I slow down the emulation in VMware and make it go “proper fullscreen” for Windows 3.11?

I have just managed to find and install my native language versions of MS-DOS 6 and Windows 3.11 in a virtual machine, just as I had on my first computer: an IBM 486 DX2 66 MHz. VM software: VMware ...