Re: What happens when a port is read/write 16/32 bits at a time to an I/O port on a x86 processor?

Posted on 2015-08-29, 11:18

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by superfury

in PC Emulation

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I've currently programmed by I/O operations like this: 32-Bit: Try 32-bit. If fails or unaligned, call 16-bit. 16-Bit: Try 16-bit. If fails or unaligned, call 8-bit. 8-Bit: Try 8-bit. If fails, log if enabled. So the call path with all failing is: 32-Bit->16-Bit->8-Bit->Log. 16-Bit->8-Bit->Log. 8- …

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Visual C++ community: effect of /MT?

Posted on 2015-08-29, 01:56

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by superfury

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Does the /MT flag also statically link the SDL.dll and SDL_gfx.dll? I need to keep those two seperate, but eliminate the need for the Visual C++ 2015 redistributable by statically linking it.

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-28, 23:16

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by superfury

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Result acts as a little buffer before returning: after the data is read into buffer, it checks if the buffer needs to be refilled, refills if needed, raises an IRQ when needed and then return the byte read (in it's current case: a byte from a hard disk sector). Btw, according to me there should be …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-28, 22:23

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by superfury

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Hmm. Anyone knows why this happens? I've switched the build from Multi-threaded DLL to Multi-threaded and enabled MFC static linking. It works fine here. Anyone knows if SDL has problems with this setup? I've used this on the SDL, SDL_main, SDL_gfx and my emulator itself(rebuilding all of them in …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-28, 14:34

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by superfury

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My latest build: x86EMU_20150828_1628.zip - Disabled invalid port logging. - Made x86EMU standalone. - Simplified adlib emulation and disabled the feedback that's still not working, to get decent sound (tested with The Secret of Monkey Island). Can someone please verify if it's running without the …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-27, 21:09

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by superfury

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My latest version: x86EMU_20150827_2256.zip - Fixed IDE LBA updating and IRQs. - Simplified locks for faster lookup. - Fixed BIOS settings loading and added security to the loading process. - Optimized CPU ModR/M retrieval. - Optimized adlib. - Optimized memory mapped I/O. - Implemented output …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-27, 14:58

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by superfury

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Well one thing that it supports (although the PSP version is currently broken (It's hanging when initialising the video support)), is a good Danzeff-inspired OSK and gaming mode(direct mapping of the PSP buttons (about 12 buttons) with full menu-based setup on the PSP (setting are changed while …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-27, 09:17

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by superfury

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It's simply because I don't know if the emulator is working or not (nobody replies if it's working with any games, software etc.), so I keep asking for replies.

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-26, 20:01

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by superfury

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OK. Here's the link from the current version: https://bitbucket.org/superfury/x86emu/src/509edd9ec7408610d07b4fedbb3ee68212daf8cd/hardware/ide.c?at=master Can you see why it keeps resending the SEEK command infinitely? From debugging it executes the seek and raises the IRQ, but for some reason the …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-26, 19:02

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by superfury

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My latest build: x86EMU_20150826_2051.zip - ATA device further build (still incomplete, so hard disks won't work yet, unless with a strictly ATA-1 commands only BIOS/driver(without Vendor Specific commands)). - Fixed BIOS external ROMs (u18/19 etc.) detection. These will now run, instead of causing …

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-26, 08:32

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by superfury

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It seems to hang with sending the same command again and again (SEEK): //ATA-1 harddisk emulation #include "headers/types.h" //Basic types! #include "headers/bios/io.h" //I/O support! #include "headers/hardware/ports.h" //I/O port support! #include "headers/emu/timers.h" //Timer support! #include " …

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-25, 19:40

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by superfury

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Isn't that a bad sector error?

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-25, 12:53

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by superfury

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How should my emulation handle that 0xFC command? Ignore it?

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Re: Free ATA-1 BIOS to use with my emulator for hard drive support?

Posted on 2015-08-25, 11:29

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by superfury

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I've managed to get the Western Digital IDE SuperBIOS v2.0 implemented in the Super PC/Turbo XT BIOS for Intel 8088 or NEC "V20" Motherboards. It now gives my ATA controller (at I/O address 0x320 by default, set in the BAR0, other bars are 0 by default) a 0xFC command. It is mentioned in the ATA …

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Re: x86EMU emulator testers wanted

Posted on 2015-08-24, 19:32

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by superfury

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My latest build: x86EMU_20150824_2044.zip - Fixed various CPU-related bugs (timing, adlib detection, IN/OUT/INS/OUTS instructions with 16/32-bit access. - Implemented basic IDE ATA-1 controller for emulated harddisks and CDROMs (you'll need a XT BIOS with PCI support to use it, the XT-IDE BIOS will …

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Please help me fix my ATA-1 disk controller emulation.

Posted on 2015-08-24, 18:15

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by superfury

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I'm using the Generic Turbo XT BIOS v2.5 with an ATA-1 controller and PCI mapping in my emulator. Anyone knows a IDE BIOS that will work with the ATA-1 hard disk controller? The XT-IDE Universal BIOS doesn't seem to work (it executes some non-ATA-1 commands and hangs trying to execute one of them.

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Re: Monkey Island demo crashes when Adlib is detected?

Posted on 2015-08-24, 07:12

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by superfury

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There was indeed a bug in the PIT timer: It only supports command code 0x36, but the demo sets it to a different value, which causes the PIT to ignore the values written to port 0x40.

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Re: Monkey Island demo crashes when Adlib is detected?

Posted on 2015-08-24, 01:00

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by superfury

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According to my debugger, it doesn't change the IRQ0 speed (it's still at 18.2Hz at the point of the divide by 0). Is this a bug in my timer, or is it actually not updated from 18.2Hz(counter set to 0) at all? Btw, does monkey island update the entire timer value, or only the low 8-bits? My timer …

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Re: x86EMU 4-color CGA mode fails retrieving graphics pixels completely?

Posted on 2015-08-23, 22:51

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by superfury

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My emulator essentially uses the equivalent of your 'graphicsModeScanline4LoRes' function on 4 planes (packed shift mode). The write/read functions look fine. We have the same VRAM layout (index SHL 2 OR plane). My planar VRAM access is in vga_vram.c, memory mapped i/o is in vga_mmu.c and graphics …

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Re: What happens when a port is read/write 16/32 bits at a time to an I/O port on a x86 processor?

Posted on 2015-08-23, 20:04

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by superfury

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What happens when a dword is read/written to/from an I/O port? Is unaligned access and with no response immediately split up to byte read/writes to the four ports, or is a word in/out performed on port X and X+2, which execute byte I/O when unaligned or no hardware response? So it's: Word->byte and …

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