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Re: i430fx motherboard emulation issues?

Posted on 2020-10-11, 22:23

Just tried the BIOS ROM for the 86box's "[i440FX] ASUS P/I-P65UP5 (C-P6ND)" machine(just the nd6i0218.awd ROM). It seems to start up partially, displays the processor and then hangs itself(using a jmp to it's own address). This might be a good starting point? How much of it's chipset is mandatory to …

Re: i430fx motherboard emulation issues?

Posted on 2020-10-11, 17:29

After this bugfix, it seems that it works properly(according to the port 402h log), but the display ROM isn't found(probably because it isn't injected into the ROM?): 00:05:20:26.00096: SeaBIOS (version rel-1.7.5-0-ge51488c-20140528_081134-morn.localdomain) 00:05:20:27.09072: No Xen hypervisor found …

Re: i430fx motherboard emulation issues?

Posted on 2020-10-11, 15:18

OK. Looks like that's working properly at least. Now, just implemented and enabled the port 402h that coreboot always seems to use to log whether Qemu is present or not. This makes it quite a bit clearer what's happening (it's just redirecting said port to the porte9 log file(or whatever it's …

Re: i430fx motherboard emulation issues?

Posted on 2020-10-11, 00:28

Just implemented the i440fx chipset based on Bochs' initial values and device IDs. Also implemented the DRAM memory chip detection based on Bochs' algorithm, but using UniPCemu's method of handling it. It's basically the same as the i430fx chipset, as far as I can see, except the DRAM being …

x86 PAE/PSE reserved bits page faults?

Posted on 2020-10-09, 19:08

I tried matching Bochs' source code on Paging with page faults for reserved bits being set in the PDE/PTE: - bit 12 for 12 bits (mask 3FF000) with the highest bit not checked in PAE mode for 4MB/2MB page. - No bits checked for 4KB PDE/PTE. Would that be correct? I previously set it to fault on bit …

Floppy reset with drive polling mode off?

Posted on 2020-10-08, 09:00

As far as I can find out about it, the IRQ will still fire, but the Sense Interrupt command would be invalid? Or would it actually return the status register being 0(due to it being cleared by a reset and the top 2 bits not set due to drive polling mode being off)? Or should it still return 0xC0 as …

Triton I TSC/TDP PCI device IDs?

Posted on 2020-10-07, 18:51

Strangely enough, when I look for it online, I find 8086:122D for the TSC/TDP unit, while Bochs uses 8086:0122 instead? Which one is correct? Linux seems to not recognise the 8086:0122 one? So both according to LInux and https://pci-ids.ucw.cz/pci.ids, the 122D one should be correct(and Bochs would …

Re: Hayes compatible modem emulation issues?

Posted on 2020-10-06, 03:39

OK. I've just added some extra code that deals with such cases, where the transmit holding register is emptied and the data holding register is filled at the same UART clock as the opposite is done by the software and hardware. So when the THR is filled at the same UART clock it's emptied and sent …

Re: Hayes compatible modem emulation issues?

Posted on 2020-10-06, 00:16

The dial-up script seems to login and communicate with the internet fine sometimes (if the login worked). But often, the login process seems to halt halfway through? Does that mean that the TCP connection itself is buggy? Or is there an issue with the modem emulation somehow? It's set up for 57600 …

Re: Hayes compatible modem emulation issues?

Posted on 2020-10-05, 20:07

Just managed to get internet working somewhat using UniPCemu's Windows 95 RTM install running on Dosbox-SVN and UniPCemu's SLIP server running using the latest commit. It just seems to have some weird requirement to be running for a little bit(a few minutes) before being able to properly start …

Re: Hayes compatible modem emulation issues?

Posted on 2020-10-05, 14:19

Just tried Dosbox SVN Daum again, but with the Windows 95 image I've used for UniPCemu too. It too seems to fail in it's DNS request of any website? The connection details show it's actually sending and receiving data contiuously, so the data transfer is actually working? Perhaps there's an issue …

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