Search \ VOGONS

Login

Login

Username

Password

2FA token (optional)

Remember me

Hide my online status this session

Lost password
Send activation email

or Create a new account
Create a new account

Common searches

Active topics

Search results

Display options

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-06, 16:20

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My i486 SX2-50 arrived today, it's a SX845 and supports CPUID, I think all SX2 support CPUID, do they? It seems to happily run @ 66 MHz and the SIV [Save Local] took a mere 10 minutes rather then the 16 minutes my SX1 took. https://www.vogons.org/download/file.php?id=161732 I now just need to know …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-06, 12:13

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The last one to sell on CPU-World with fan was $13. I have one sat on the desk in front of me. Seen them as high as $60 as well. Thank you, I look @ CPU-World one in a while and feel most of the time it's hard to find is a given CPU is for sale, maybe I am doing something wrong, when I searched for …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-06, 10:15

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

To enable x4 mode, put the x2/x2.5/x3 jumper into the x2 position. Thank you for confirming what will happen, I recall reading x2 means x4 somewhere, but can't recall there. I just looked in the datasheet and can't find anything about which multiplies are supported. I assume an ADZ is preferable to …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-06, 08:08

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, it is. It seems to show that the board is physically not compatible with the Intel &EW WB protocol, even though the chipset and the BIOS would support it if the required traces and jumpers were present.. I just spotted a cheapish AMD Am5X86 CPU on eBay which made me wonder if this would work …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 23:32

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There are also docs like this: http://datasheets.chipdb.org/SGS%20Thomson/x86/486/4193.PDF Thank you, very handy. It says the Intel DX4 supports x2.5, so I just tried it and it does not work, my CPU ended up @ 66 MHz rather than 83 MHz, do you know if x2.5 should work please ? It's connected using …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 23:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

jakethompson1 wrote on 2023-04-05, 22:56: The ones that have WB L1 would be: Thank you for the summary, in many ways it's harder to know what these old CPUs support than Ryzen/Epyc as the datasheets are no longer on the AMD site, not even the NDA one.

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 22:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I didn't think any of the non-clock doubled 486 CPUs had support for WB internal cache AFAIK it's just the later Intel DX2 + DX4 + PODP5V that have support for WB L1 cache. Do you mean "didn't", if so which other CPUs do you think have? I wonder why my SX807 has CPUID 0436 which is different to the …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 15:00

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm unsure whether the latest 486SX-33 include WB support (it would say "&EW" on the case), but if not, the 486DX or 486SX just will ignore this resistor. Thank you for confirming things and for now I won't be making any hardware mods. With my Intel DX4 100 installed the system is fast enough for …

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-05, 14:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

My i486 DX-33 arrived today, it's a SX729 so has a CPUID of 0404 . With reference to the documentation Windows NT should report Revision FFA4 but FFD0 is reported which is what CPUID 0430 should/would report. It's starting to like like the Revision is next to useless for x32/x86 as the only time …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 11:31

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

try connecting that pin to Vcc (to be safe, you can use a 4.7K resistor or something like that) Thank you, I gave it a try, with 4K7 to VCC I saw about 4.6 Volts on T1, the system posted, said (WB) and corrupted the CMOS. I also noted the 463 meaning a speed of 63 rather than the usual 66 MHz. Is …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-05, 07:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

see whether your board has connectivity between C14 and pin T1. If not, you have one of the boards mkarcher was alluding to (I have one of them also). You can also check whether either side of the jumper has connectivity with either of those two pins. Thank you, C14 is connected to T1, but I can't …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-04, 23:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Writing to CR0 to enable WB is a Cyrix thing, accompanied by locking the NWT "no write-through" bit to keep the cache in WB. For Intel/AMD processors, the processor enables the WB protocol if the WB/WT pin is pulled high on RESET. If the WB protocol is enabled, the processor samples the WB/WT pin …

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-04, 17:42

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

drosse1meyer wrote on 2023-04-04, 17:06: CPU: A80486DX4-120SV8B Thank you, the AuthenticAMD confirms it has CPUID support so it's easy for SIV and all other programs to correctly report it.

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-04, 16:00

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Fyi it has an AMD 120 in it OK and it just occurred to me, please will you post the REPORT output from CHKCPU ? This should provide me enough information to know what SIV would likely report. I think it works best when you run it from DOS without W 3.1 being active. Will you also post a link to …

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-04, 14:54

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I felt I needed an Intel 486 that did not have CPUID support and noticed my local computer recycler had an Intel i486SX-33 so I popped round on my bike and got it. It's CPUID 0423 and had CPUID support, I wonder do all Intel i486SX have CPUID support?

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-04, 14:53

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I noticed my local computer recycler had an Intel i486SX-33 so I popped round on my bike and got it. I was quite surprised when it supported CPUID, do all Intel i486SX? https://www.vogons.org/download/file.php?id=161563 The floating performance is much as I expected, the Menu->File->Save Local took …

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-04, 14:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I only have win 3.1 on my 486, does this app work with that OS? Thank you for your interest and no, I looked into making it work on 3.1 using WIN32S, but did not get very far, further I suspect most systems that only have 3.1 are tight on memory, SIV really needs >= 32 MB to run with reasonable …

Re: SiS 85C471 and Cyrix CX586 CPUs

Posted on 2023-04-04, 11:07

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm running QDI V4S471 with Cyrix 5x86/100, works flawlessly. Good, I expected it would work, what I am wondering is what will get returned when the Cyrix CRn registers are read. Assuming you have Windows NT or 9X on the system please will you run my SIV utility and post the initial and Menu-> …

Re: SIV detection of AMD Am486 vs. Intel i486 from within Windows

Posted on 2023-04-04, 07:41

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I am also interested in reports from Alpha and Itanium systems.

Re: Detecting if a CPU is an AMD Am486 or an Intel i486 - general advice

Posted on 2023-04-03, 23:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I just checked and it looks like Windows 9X does not report Level and Revision when we really need it :( Level is no big deal as for 386 + 486 it's the same as Type. Windows 95 always returns Revision zero, 98 + Me return the same as CPUID, but it looks like if there is no CPUID they also return …

Page 2 of 69

Go to top of page Go to top of page