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Re: How is a non-present slave detected on an ATA channel?

Posted on 2022-05-01, 23:01

in PC Emulation

in PC Emulation

Michal Necasek investigated this some time ago and posted here: https://www.os2museum.com/wp/reading-from-void/ Summarizing the relevant point of that post: IDE interface boards should make sure that BSY appears clear if the drive doesn't actively pull it high. It does so by having a pull-down …

Re: Effect of ELCR set on the IRQ lines and 8259 PIC?

Posted on 2022-05-01, 16:16

in PC Emulation

in PC Emulation

I believe that's an erratum in the Intel PIIX/PIIX3 datasheet - I believe the specification update says it should be active high instead. So the effect is the same as setting the edge/level setting of the PIC (which does not work on the PIIX* precisely because the ELCR is meant to be used instead), …

Re: 2 short beeps warning, I'm at a loss! [SOLVED]

Posted on 2022-02-24, 16:28

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Would it be possible to upload a dump of this board's BIOS?

Re: Ensoniq / Creative AudioPCI

Posted on 2022-01-20, 01:11

in Marvin \ Sound

in Marvin \ Sound

I have a question - how does the MIDI UART FIFO work on this? The datasheet is very unclear on this. There's 8 bytes of FIFO, but are all 8 bytes used for TX and RX together, are there 4 bytes for TX + 4 bytes for RX, or what's going on?

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-26, 18:43

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, the status of the chip can be easily determined by booting the machine and seeing if you still see that 'P' at the right end of the string at the bottom, as that comes from the keyboard controller (command 0xA1). If it's there, then the keyboard controller is working and the problem is …

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-26, 15:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello Mumak, I saw this thread, and I'd thought I'd help. Never have I've been so excited to run HWINFO before! (being serious) I grabbed the latest version from your website (modified date April 13, 2020), which is older than the one you just posted above, but I encountered no issues, so I guess …

Re: UMC UM82C491 datasheet?

Posted on 2021-12-17, 23:38

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Anonymous Coward wrote on 2017-01-05, 22:45: Nope. I downloaded all the datasheets for 386/486 chipsets I could find. Aside from the 480 chipset, I couldn't find any others for UMC. Would you be able to upload the UMC 480 datasheet somewhere? As I can't find it anywhere anymore.

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-14, 00:03

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello Mumak, I saw this thread, and I'd thought I'd help. Never have I've been so excited to run HWINFO before! (being serious) I grabbed the latest version from your website (modified date April 13, 2020), which is older than the one you just posted above, but I encountered no issues, so I guess …

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-10, 22:51

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's fine to put them here, just put them into a .RAR or something and they can be attached easily. And sad to hear that about your 286.

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-10, 21:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh, thank you very much! Yes, I meant the 386SX. Also, I have now attached JETKEY.COM (in it own .RAR on this post) that does the excat same (except the file is named JETKEY.BIN), but saves the output file after every keyboard controller command run, just in case AMIKEY.COM ends up in a hang or …

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-10, 11:33

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I see, but that's missing the final character that only appears on the POST screen, and is obtained by running keyboard controller command 0xA1 (AMI get controller version), and that's what I need, in order to know which AMI keyboard controller version that copyright string belongs to.

Re: HWiNFO for DOS resurrected !

Posted on 2021-12-10, 10:52

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello an info on the fly. I restarted a 386SX and I was wondering: can your program work? I remember that it goes on the 386 but I don't know if it works on the 386SX, this being quite similar to a 286 (ie 16 bit instead of the 32 of the 386). If it is possible I would like to try it these days, I …

Re: 86Box increase speed

Posted on 2021-11-01, 09:45

in PC Emulation

in PC Emulation

You just need to go to Settings and choose an emulated machine that's ACPI-capable. On PCem, that's going to be that lonely Gigabyte with 440BX and the one VIA Super Socket 7 machine, but on 86Box, you have a wider selection of machines with ACPI, including for Pentium, eg. the NuPro with 430TX.

Re: 86Box IBM AT 5170 Emulation and Advanced Diagnostics Disk Error

Posted on 2021-11-01, 09:33

in PC Emulation

in PC Emulation

The real 5170 isn't going to override whatever the diagnostics diskette writes there with date and time from somewhere else, so it's very unlikely the diagnostics diskette is going to be reading that value from the century register at that point. I also haven't tried forcing, say, a value of 19h (ie …

Re: 80x86/Vxx PC emulators with x87, EMS, UMBs and no artificial 640KiB limit ?

Posted on 2021-09-21, 09:40

in PC Emulation

in PC Emulation

Jo22 wrote: Do PCem/86Box now finally support 704K of working RAM ? 86Box should be able to do that if you use one of the emulated memory expansion cards and configure its size and starting address correctly.

Re: HWiNFO for DOS resurrected !

Posted on 2021-08-01, 18:17

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I stand corrected, that's not an 82C311 but an 82C711, which is an I/O chip that, for some reason, uses the same protocol as SMC. This means the MG-9275 remains a mystery - someone in this thread probed the VL82C330 ID registers on it and got FF, so it must be something else. The question is what.

Re: HWiNFO for DOS resurrected !

Posted on 2021-07-31, 04:56

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Huh, according to the datasheet it should be F2-F3. Don't know what else to do to detect it if the result isn't as described. Here a new build: - Disabled AHA-1540 detection again. - Automatic exclusion of SIO check for this board. You might test with 8042 and SIO check enabled - Added FPU …

Re: Help finding out more about this computer? (Gateway 2000 486/33E..?)

Posted on 2021-07-05, 15:48

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

- zlucarson: Would you be able to make a dump of that 4.26 BIOS? That would be greatly appreciated, thanks in advance.

Re: BIOS image collection - requests, discussion etc

Posted on 2021-06-18, 02:50

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The JETWAY J-403TG (VER.D2E) BIOS here: Re: 80486 BIOS image collection . Is it really of that board? The board as an OPTi 895 chipset but the BIOS has an UMC491 string.

Re: Floppy disk write sector vs implied seek?

Posted on 2021-06-13, 18:09

in PC Emulation

in PC Emulation

You would get a timeout due to the FDC not getting any data from the drive.

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