Re: Testing and fixing UniPCemu's CPU and UniPCemu progress

Posted on Today, 10:24

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by superfury

in PC Emulation

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There's a video guide and link to getting started on the manual of the app(wiki). It's explained for the PC version, but counts for other platforms as well (although there might be a difference where to place the files on different consoles (the root path of the app)). Mostly place the ROMs …

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-08-07, 06:37

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by superfury

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I'm confused about this, is the goal here to work around a limitation in the number of control lines in com0com or 9-pin ports so you can more fully emulate a modem's behaviour? Both, actually. I use COM0COM to test the configuration for physical serial cables. UniPCemu ofc supports both using a …

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Re: Best emulator for 2D football game

Posted on 2022-08-05, 15:51

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by superfury

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UniPCemu can handle Pentium II with accurate CPU(without FPU/MMX though), 2D acceleration(ET4000/W32 with actual CRT emulation(no physical effects though, other than raster emulation for any video mode you can program (using x/y precalcs, think like a rails where a precompiled 'program' for …

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Emulating modem ring and picking up then line when it can using SDL(2)_net?

Posted on 2022-07-30, 17:33

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by superfury

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I'm trying to get UniPCemu to detect when a line is ringing (which it knows by the request of a server socket being available). But then when the client disconnects (closes the connection from the connecting client), the server socket still seems to keep reporting that another TCP connection is …

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-28, 13:23

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by superfury

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OK. A slight revision of the cable, with signal ground (pin 5) connected on all four devices: Filename 1024px-D9_Dual_Null_Modem_Wiring.png File size 137.19 KiB Views 152 views File comment Revised version, with signal ground added.

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-26, 20:29

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by superfury

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Just adjusted the little image of the wiring of the cables from Wikipedia to show how UniPCemu assumes it is (although one of the two bottom's wires might be ommitted and grounded instead). 1024px-D9_Dual_Null_Modem_Wiring.png UniPCemu is then connected to one of the top serial ports as the primary …

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-26, 16:03

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by superfury

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Anyone out there who wants to try and use UniPCemu's dual serial port dial-up modem configuration (using the modified nullmodem cable split into two serial port headers to connect to the two serial ports for UniPCemu to provide the device on)? It can easily be combined with another UniPCemu instance …

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-25, 23:04

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by superfury

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It makes me wonder, though... Do the RTS, CTS, DTR, DSR, DCD and RI all use the same TTL and polarities? So can you connect RTS to RI and DTR to DCD and make DTR being set to 1 setting DCD to 1? And the for raising RTS to raise RI (Making the modem spew out a "RING" message if setup to. Lowering it …

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Re: Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-25, 20:45

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by superfury

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OK. Having setup the COM0COM app as on a real serial port, although the lines from the second port are received from the second port. I now make the following connections in COM0COM: Primary ports: DTR-DSR RTS-CTS DCD&RI - inverted of ON (so always off, as they are done by the second port inputs …

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Windows 10 combine two virtual serial ports with different wirings into one serial port?

Posted on 2022-07-25, 15:01

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by superfury

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I want to perform the following: Virtual COM1 <-> Virtual COM5 (normal connection, full DTR-DSR&RTS-CTS nullmodem configuration, without DCD and RI on both sides). Virtual COM1 <-> Virtual COM7 (special connection, only lines connected being DTR<->DCD and RTS<->RI, data lines disconnected/don't care …

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Re: Testing and fixing UniPCemu's CPU and UniPCemu progress

Posted on 2022-07-24, 23:14

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by superfury

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OK. For fun just added a second virtual serial port to verify UniPCemu's extra second serial control port support. I found https://freeserialanalyzer.com/ , connected it to the second serial port UniPCemu was connected to and looked at the RTS and DTR lines on it. I started a simple putty session, …

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UniPCemu's server build user thoughts?

Posted on 2022-07-21, 15:55

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by superfury

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Anyone out there using the UniPCemu server builds? And of course I want to know your thoughts on it. It supports various protocols to be used with (the most simple of them being PPP and SLIP). It also supports IP addresses, but might require Gratuitous ARP to be supported on the modem to be properly …

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Re: Stresstesting RAM throughput in emulators?

Posted on 2022-07-14, 07:29

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by superfury

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Managed to stress it more by fixing some issues with it. Now it's down to 17%. Although Windows 9x/NT does a better jpb somehow(lowering it to 7% and 14% sometimes)? Oddly enough, even though RAM accesses are more optimized in the profiler, throughput seems lower in total? If you look at UniPCemu's …

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Stresstesting RAM throughput in emulators?

Posted on 2022-07-11, 16:16

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by superfury

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I've created a little BIOS ROM program myself (can be found in UniPCemu's git repository, at UniPCemu/assembly/testRAMthroughput.asm, compiled with nasm on Windows in my case). It essentially keeps executing a MOVSD instruction at unaligned addresses (starting at offset 1) in a loop. But the loop …

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Re: Windows NTFS 4GB partition on i440fx?

Posted on 2022-07-06, 20:33

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by superfury

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Hmmm... Decoding the data in the VBR gives me the following information: Bytes/sector: 512 Sectors/cluster: 1 Volume reserved sectors: 63 sectors Volume start (calculated): 63(reserved sectors)=Sector 63 MFT start: cluster 318A3h MFT sector start: 318A3=318A3. MFT table start=631c400h=((318A3h(start …

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Re: DOS Games crash under Windows 95

Posted on 2022-07-04, 22:05

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by superfury

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Well, if you look up a diagram of the Windows 9x architecture, you'll see why the MS-DOS game crashes under Windows. It's trying to do kernel mode (ring 0 only is allowed to do that) privilleged stuff while running as a MS-DOS app in ring 3(user mode). The processor forbids that use case, thus …

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Re: DOS Games crash under Windows 95

Posted on 2022-07-04, 13:15

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by superfury

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It looks like it's trying to run in protected mode (32-bit) while Windows is running. Normally, Windows doesn't allow the second memory manager to access Windows' protected register(CR0), which would break Windows if it did. The only option is to run in barebones MS-DOS in such a case. It's trying …

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Re: Windows NTFS 4GB partition on i440fx?

Posted on 2022-07-03, 07:01

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by superfury

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1. Try another BIOS, the one you are using may have IDE translation bugs. 2. Windows NT 4.0's setup creates a FAT16 partition to the target size you want before converting to NTFS. Given that FAT16 has a maximum size of 4GB (64k clusters are supported on NT), you may be bouncing off the limit. I …

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Re: Windows NTFS 4GB partition on i440fx?

Posted on 2022-07-02, 16:42

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by superfury

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Hmmm... The boot loader crashes at 0D00:0510, trying to access DS(0D00):EAX+C, where EAX=8888xxxxh. So the 8888 part causes a #GP fault in real mode because it's out of range of the 16-bit address range of the DS segment descriptor cache (which has a limit of 64KB).

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Re: Windows NTFS 4GB partition on i440fx?

Posted on 2022-07-01, 10:51

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by superfury

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OK. After comparing the boot record between the FAT(first part of setup) and NTFS(after the first boot converting it and then failing to boot it again), I see two bytes different in the MBR. This changes the number of sectors in the parition (but leaves CHS unaffected) from 7FFFA1h to 6001A1h ( …

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