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Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-27, 07:21

in Release Announcements

in Release Announcements

Further inspecting the boardview I found that there are two other devices on the LPC bus (TPU, to be precise). I wonder if these TPUs are somehow conflicting with the LPC-ISA bridge's functionality... such as using the same 4E/4F register pair for configurations. On the other hand, assuming SuperIO …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-26, 11:50

in Release Announcements

in Release Announcements

Putting AMD-related experiments aside... I'm currently testing my v0.2 build on a different Intel board I'd like to use it on, and ran into a strange issue. While my program can detect the F85226 bridge, the register values are messed up. Except register 05h which reads like xEh (with x keeps …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-23, 03:44

in Release Announcements

in Release Announcements

I cannot say about AMD PSP but intel ME shouldn't act like this. ME can directly communicate with eth. controller and capture some packets but it shouldn't actively block some IO or memory transactions if not remotely instructed to do this. I don't think PSP has anything to do with this. AMD …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-22, 11:23

in Release Announcements

in Release Announcements

AMD PSP may hog some hardware addresses or what do you mean by security? I mean if there's something in the chipset actively trying to interrupt (abort) I/O on unknown/undesired legacy address ranges, like how LPC writes were being aborted halfway. Something like a firewall which actively rejects …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-21, 06:23

in Release Announcements

in Release Announcements

SBEMU uses 386+ I/O port trapping features on the CPU side, nothing is sent on the bus in respect to legacy I/O access. As for interfacing with adiuo cards, SBEMU does it basically the same way as any OS audio drivers would do, using BIOS/UEFI-configured memory/IO ranges and interrupts. I did take …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-18, 08:50

in Release Announcements

in Release Announcements

Tested this on my AM3 system (990FX/SB950) and the host PCI bridge (00:14.4) is there. The bits responsible for enabling subtractive decoding are set, however. I wonder if I need to disable subtractive decoding for the host PCI bridge to allow LPC bridge access the addresses, or the issue might not …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-15, 13:27

in Release Announcements

in Release Announcements

Probably has something to do with subtractive decoding. I did some search about it... looks like you need to set the bit 5 of the register 40h (as well as bit 7 of the register 4Bh) on device 14h, function 4 (PCI-PCI bridge). However, I don't know if this device (which would be 1022:790f) still …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-15, 02:41

in Release Announcements

in Release Announcements

The LPC bridge does start to pass the data through, it's just aborting the write halfway through. It sounds a lot like subtractive decoding, which is a PCI thing. I wonder if it's worth digging through PCI - maybe there's a virtual (or even real) device on the PCI/PCIe bus that's claiming those …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-13, 03:46

in Release Announcements

in Release Announcements

Maybe AMD's ACPI implementation has the LPC bridge disabled? No. The bridge (Device 14H Function 3) is still there as it's needed by SuperIO. The problem is that the bridge's functionality feels kind of castrated. The IO Port Decode Enable register (44h) contained a lot of ranges, including those …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-13, 00:59

in Release Announcements

in Release Announcements

I followed the + mark on the PCB when soldering the LEDs... if all the LEDs are to point to the same direction then I've soldered the negative ones wrong... v0.3 is going to have better diode markings, as well as orient the capacitors so they're all pointing the same way too. Is this clearer? I …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-12, 15:08

in Release Announcements

in Release Announcements

they were indeed correctly oriented (to be precise, the opposite direction of the positive voltage ones which are working) All the LEDs should point the same way, ironically I did that so people wouldn't have to second guess the orientation... Kicad's default libraries are horrible. The negative …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-11-12, 08:35

in Release Announcements

in Release Announcements

I did some tests on an AM3+ (990FX/SB950) board and sadly... it's still not detecting the bridge. Will be testing the adapters on my Intel boards when convenient... I've soldered a 8.2K between MASTER# and +5V under the ISA slot... so the boot issue should be taken care of. EDIT: Just tested it on …

Re: The Soundblaster DSP project

Posted on 2023-11-09, 14:19

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

No, that's not it. For practical purposes, there's no difference between a 16v 10uF cap and a 50v 10uF cap. There are times when it is preferable to use a cap with a lower voltage rating (sometimes capacitors within the same series with the same dimensions but with different voltage ratings will …

Re: The Soundblaster DSP project

Posted on 2023-11-09, 11:04

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Source code update. small optimizations with MACRO usage - much easier to read and understand, looks nicer I'm currently using this version (calling it v6) and I noticed something odd after using it for a bit. Namely 16-bit audio stopped working (hung) in some if not all cases -- namely Windows NT …

Re: Converting Removable CF cards to Fixed... any good place for information about CF controllers?

Posted on 2023-10-31, 02:57

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Some iterations of partition editors seem to let you flip the removable or fixed bit in Linux, but I am not sure which ones, seemed Lubuntu was shuffling from one to another all the time. Anyway, best keep it away from windows built in system management editor, I swear that thing just sets what it …

Re: Converting Removable CF cards to Fixed... any good place for information about CF controllers?

Posted on 2023-10-31, 01:14

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I seem to recall that, at some point, some OSes started explicitly caring about this. I could be wrong. I think I recall that Windows XP either does not like booting from or installing to (maybe both) a drive with with the removable bit set. In Windows 2000 you can force a disk to be considered as …

Re: +5V Load Balancer?

Posted on 2023-10-30, 14:34

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've found this tho, but max 5v wattage output is still limited, unless I'm reading it wrong: https://phanteks.com/PH-PWCOB.html PS: any other way to combine 2x PSU with one having 12v>5v and having those two supply one mobo? I guess that's a limit for safety. You probably can draw more currents on …

Re: Converting Removable CF cards to Fixed... any good place for information about CF controllers?

Posted on 2023-10-30, 04:53

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Is this relevant at all? https://www.delkin.com/blog/technical-guide-compactflash-cf-secure-digital-sd-cards/ the CF card has a TRUE IDE mode, which allows the CF card to function exactly as a PATA/IDE drive. This mode is entered when the card has pin 9 grounded on the 50 pin connector when power …

Re: +5V Load Balancer?

Posted on 2023-10-30, 01:09

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So there's no way to take 12v rail and DC-DC to 5v and get that into the mobo? Also, 24A +5V is 120W, not really that much, seems okay, but nothing special, no? The EVGA PSUs I'm looking at have 24A for 5V, but there are some other vendors, including Corsair (from the PSUs I could find specs of), …

Re: dISAppointment - LPC to ISA adapter - ISA on modern motherboards

Posted on 2023-10-30, 00:11

in Release Announcements

in Release Announcements

I wrote code to just spam reads to every port below 400, after running your program. I don't know what flavour of LPC sigrok's decoder expects but it sure ain't the LPC that any of my motherboards speak. So these are transcribed by hand, and there may be mistakes. If the port doesn't appear in this …

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