Re: Emulating Area5150

Posted on Today, 13:43

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by superfury

in PC Emulation

in PC Emulation

OK. Mostly went fine, but somehow the overscan seems to always seems to be black? Should be easy to fix. The color control register controls the overscan color. During the 3D vector part. it runs almost 100%, except the area between the 3D object going up and down has black between the jumping area …

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Re: Emulating Area5150

Posted on Today, 09:59

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by superfury

in PC Emulation

in PC Emulation

OK. Now testing the demo in UniPCemu... So far it starts out fine until the vertical color scrolling (after 'pushing the boundaries') at least. One weird thing is that the overscan is black when the demo starts until the pushing the boundaries sets it to blue? Continuing the demo... Vertical raster …

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Re: Emulating Area5150

Posted on 2023-05-25, 22:40

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by superfury

in PC Emulation

in PC Emulation

Just saw this as well. Guess I'll just have to try and run it on UniPCemu and see how it performs or breaks. I guess it might work, but cycle accuracy on the CPU might affect it a bit (seeing the remaining issues in 8088MPH still being a bit of cycles off last time I ran it, although only affecting …

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Re: what were the first games to use 16bit color?

Posted on 2023-05-15, 15:10

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by superfury

in Milliways

in Milliways

Just tried Zork Nemesis on MS-DOS. Entered the following lines before running ZORKDOS (because UniPCemu has no 387 or any FPU for that matter): set GO32=emu D:\emu387 set 387=N Should that be enough to get it to run without a FPU emulated by the emulator itself (using emu387 instead)? Got a …

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Re: what were the first games to use 16bit color?

Posted on 2023-05-14, 21:15

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by superfury

in Milliways

in Milliways

Does Magic carpet also use it in normal mode?

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Re: what were the first games to use 16bit color?

Posted on 2023-05-11, 16:18

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by superfury

in Milliways

in Milliways

Can any of those 16-bit color games run on a ET4000 or ET4000/W32? As far as I tested, the 11th hour game flat out refuses it (due to the linear framebuffer being unusable).

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Re: No CRT Emulation? Why!?

Posted on 2023-05-03, 17:06

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by superfury

in PC Emulation

in PC Emulation

Just a little question: is it possible to make shaders that don't need to be recompiled for each new platform and can be exchanged between emulators (so something that can be parsed by simply adding some files to any possible platform and rebuild of the emulator (or at least the ones supported by …

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Re: Missing operating system

Posted on 2023-04-18, 21:02

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by superfury

in PC Emulation

in PC Emulation

MBR is damaged or missing. As mentioned by mkarcher, booting from a Windows 95 recovery disk or an MSDOS disk and typing in fdisk /mbr will rewrite your MBR without altering the partition table. Credit where credit is due: superfury suggested fdisk /mbr first. My primary suggestion was to make sure …

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Re: Missing operating system

Posted on 2023-04-17, 06:18

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by superfury

in PC Emulation

in PC Emulation

jakethompson1 wrote on 2023-04-17, 03:56: sys c: That might depend. I don't know if the MSDOS.SYS that's written is for Windows 9x boot or MS-DOS boot. If not Windows 9x-compatible, it destroys the Windows permanently, requiring a reinstall of Windows to fix.

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Re: Missing operating system

Posted on 2023-04-16, 17:38

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by superfury

in PC Emulation

in PC Emulation

You could open the image with winimage or 7-zip etc. and check if the files are still there(at least IO.SYS). Then if they're present, check the MBR by running A:FDISK /MBR from a Windows floppy disk (actually MS-DOS 7.1) created or used during installation). You'll need to "cd C:" first though ( …

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

Posted on 2023-04-11, 20:27

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by superfury

in PC Emulation

in PC Emulation

The latest changes are now released on itch.io! One small change on the CPU emulation is also added: all TLB entries used with paging now have their pointing (for the LRU cache algorithm) and data (the tags and other related data) merged into one single 30-byte structure that's used for all TLB …

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

Posted on 2023-04-09, 07:38

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by superfury

in PC Emulation

in PC Emulation

Just modified the directory creating a bit when parsing the redirect.txt files during app initialization. Now the folders are only created at two stages: - When the root folder has been determined after all redirects are followed. - When checking a path for writability. That prevents any unused …

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

Posted on 2023-04-08, 23:56

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by superfury

in PC Emulation

in PC Emulation

OK. Managed to improve and fix the redirect.txt system a bit. It will now recognise some relative and absolute paths. So it counts *:// as URL, starting with / (invalid path on Windows/PSP) as absolute, URL syntax using flash*:/ and ms0:/ on PSP as absolute (flash storage) and single letter c:\* on …

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

Posted on 2023-04-07, 04:28

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by superfury

in PC Emulation

in PC Emulation

Just managed to improve the Android redirect.txt file to also be able to automatically load (top priority) from the UniPCemu folder on internal storage (where it finds the Android/data/com.unipcemu.app folder being located). This has higher priority than the redirect.txt file inside said folder now, …

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SVGA True Color 32bpp RAMDAC?

Posted on 2023-04-03, 10:15

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by superfury

in PC Emulation

in PC Emulation

One nice thing about the Tseng video cards (ET3000/4000 and it's ET4000/W32/i/p variants) is that it supports different RAMDACs (in Dosbox/UniPCemu at least). Are there any RAMDACs with real 32BPP (RGBA, thus not RGBa (with alpha disabled)) supported by BIOS ROM or Win9x/MS-DOS drivers (like …

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Re: x86 TSS task switch vs PDPT entry cache?

Posted on 2023-03-13, 17:38

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by superfury

in PC Emulation

in PC Emulation

OK. Just looked at Bochs. It looks like it generates a plain #TS(incomingTRsel) fault instead of a #GP fault in that case. Just modified the UniPCemu TSS task switching handling to behave the same (also let the caller throw a #GP or #TS exception accordingly).

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x86 TSS task switch vs PDPT entry cache?

Posted on 2023-03-12, 17:08

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by superfury

in PC Emulation

in PC Emulation

When performing a x86 TSS task switch (using JMPF,CALLF or an IRET(D) with NT set), when is the PDPT 4 entry table (for PAE mode) loaded and verified? Is that done in the context of the incoming(like most other general purpose registers and selectors) or outgoing task?

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

Posted on 2023-03-11, 17:32

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by superfury

in PC Emulation

in PC Emulation

Just improved the BIU to support 64-bit loads and stores (although not reduced to multiple 32-bit stores in reality, instead being parsed as a 32-bit store (for the first byte) followed by 7 byte stores instead). Also added some extra functionality for retrieving results from the BIU for a 32/64-bit …

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Re: Intel Inboard 386 XT/AT emulation help?

Posted on 2023-03-11, 16:35

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by superfury

in PC Emulation

in PC Emulation

Wrt the CPU emulation, I've just improved the BIU somewhat. It's now able to read/write 64-bit chunks of memory (although performed in a 4-byte, immediately changed to 1-byte write, followed by 1-byte chunks atm, the BIU doesn't handle it that well yet, due to being unable to break it into straight …

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Re: Intel Inboard 386 XT/AT emulation help?

Posted on 2023-03-09, 14:06

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by superfury

in PC Emulation

in PC Emulation

So, assuming that the waitstates for speeds 0-3 are as follows (in byte registers 670h(low)/674h(high)): 0=2500h 1=8000h 2=0001h 3=8001h OK. I've just added a simple implementation of the Inboard 386/AT to perform those four waitstate values based on bits 674's highest bit (routed to bit 0 for …

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