Re: CMS/Gameblaster Rewrite and accuracy

Posted on 2015-10-19, 06:55

by

by Harekiet

in DOSBox Development

in DOSBox Development

Thanks to Keropi I've also got an sb2.0 with cms and gal chips going now! Hooked up the scope to confirm the frequency and it's indeed the 7 something mhz thing. I tried scoping out the actual output pins of the cms chip but it's some much higher frequency pwm output and it's passing through a bunch …

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Re: CMS/Gameblaster Rewrite and accuracy

Posted on 2015-10-05, 09:13

by

by Harekiet

in DOSBox Development

in DOSBox Development

@phil I think most of those have already have recordings on youtube, although some might have already been from dosbox. But you might see some effects of the low pass filter when just sticking to 1 channel doing a simple square wave. @keropi I have a sb2.0 without the cms and gal chips. Should have …

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Re: CMS/Gameblaster Rewrite and accuracy

Posted on 2015-10-05, 08:42

by

by Harekiet

in DOSBox Development

in DOSBox Development

Yeh I imagined it should have been mentioned before already somewhere but it's difficult finding things through all the posts. Overclocking the ISA shouldn't be problem since that clock line runs it's own crystal. As for recording some test samples you'd probably want some test program or wasn't …

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CMS/Gameblaster Rewrite and accuracy

Posted on 2015-10-05, 07:19

by

by Harekiet

in DOSBox Development

in DOSBox Development

I was busy rewriting the cms/gameblaster stuff a bit But I was wondering how accurate is the current implementation in dosbox. From what I see dosbox assumes the cms to run at 8mhz while the real thing should run at 7.1ish mhz using the same isa clock as the adlib uses. I'm lacking an actual …

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Re: Desoldering capacitors on motherboard

Posted on 2015-09-10, 16:06

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by Harekiet

in Milliways

in Milliways

Preheat the area of the board you wanna desolder with a heatgun, use a big tip, add some solder to your trip to increase heat transfer and even then the weller might just not have enough power.

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Re: Visual C++ community: effect of /MT?

Posted on 2015-08-29, 15:04

by

by Harekiet

in PC Emulation

in PC Emulation

That sounds about right yeh. Try a freshly installed windows in a virtual machine to test it out

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Re: Visual C++ community: effect of /MT?

Posted on 2015-08-29, 07:54

by

by Harekiet

in PC Emulation

in PC Emulation

I think the sdl dlls statically link the runtime at least so only link your own app statically as well and you shouldn't need the runtimes anymore. Still will need to copy the sdl dlls along with it

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Re: x86EMU emulator testers wanted

Posted on 2015-08-28, 20:24

by

by Harekiet

in Release Announcements

in Release Announcements

well the emulator would just crash since it couldn't find a sound device that was the biggest problem really.

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Re: x86EMU emulator testers wanted

Posted on 2015-08-28, 09:17

by

by Harekiet

in Release Announcements

in Release Announcements

should make static binaries, damn runtime requirements. oh well vs 2015 runtime installed It needs a nosound mode since I don't have a soundcard when running from remote desktop 😀

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Re: x86EMU emulator testers wanted

Posted on 2015-08-27, 12:06

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by Harekiet

in Release Announcements

in Release Announcements

You'll just have to do your own testing, no one wants to try a half working emulator

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

Posted on 2015-08-26, 11:08

by

by Harekiet

in PC Emulation

in PC Emulation

Well that code looks to horrible to even read it, really why not just use some temporary pointer to the active ata object instead of the endless copy and pasting. I think I just ignore the seek command and signal the irq that it completed, should probably check for it being within limits but …

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Re: Death in adventure games. Annoying or Entertaining?

Posted on 2015-08-26, 08:02

by

by Harekiet

in Milliways

in Milliways

I don't mind deaths but I hate unwinnable paths without any information that you're screwed.

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

Posted on 2015-08-26, 06:20

by

by Harekiet

in PC Emulation

in PC Emulation

Nah I think it's some bitmask register of different error states but just having the error bit set seemed fine

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

Posted on 2015-08-25, 13:49

by

by Harekiet

in PC Emulation

in PC Emulation

I just set the error code to 1 and the status bit for having an error.

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

Posted on 2015-08-25, 12:42

by

by Harekiet

in PC Emulation

in PC Emulation

Weird I made my ide emulation using the xtide bios and didn't really encounter anything strange. The only one I error out on is ATA_CMD_SET_FEATURES = 0xEF I just give an error for that one and the rest are seek/read/write/verify/identity commands pretty much

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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 2015-08-24, 13:50

by

by Harekiet

in PC Emulation

in PC Emulation

A 386 SX only has a 16 bit data bus so it won't even try to do any 32bit stuff and immediatly break them up in 16/16 or 8/16/8 A 386 DX has some extra line on the data bus so it can work with 16 or 32bit memory banks. Although I don't think there's any delays involved, it tries to access 32bit and …

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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 2015-08-24, 08:06

by

by Harekiet

in PC Emulation

in PC Emulation

Well considering the ISA bus is only 16 bit you'll only ever get 16 bit access to isa devices but PCI and VLB do allow for direct 32bit transfers With aligned transfers the cpu will requests a direct 32bit transfer if memory/bus fail to respond it tries for 16/16 bits. Unaligned transfers will have …

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Re: New emulator

Posted on 2015-08-24, 07:10

by

by Harekiet

in PC Emulation

in PC Emulation

Great effort, looks nice. And indeed it's much easier to just use the bochs and plex bios. A Some of the other bioses that pcem supports require more emulation of the controller chips for shadowing roms and mapping ram around. Although been toying with making another x86 emulator myself and it is …

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Re: Monkey Island demo crashes when Adlib is detected?

Posted on 2015-08-24, 06:40

by

by Harekiet

in PC Emulation

in PC Emulation

You'd use the emulated cpu or bus clock as the base of all your timing and timers if you hope to go for any kind of accuracy. DOSBox just records an internal timestamp generated from basetime and the amount of clocks done in the current cpu time slice. So save timestamp when adlib timer starts, then …

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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, 18:51

by

by Harekiet

in PC Emulation

in PC Emulation

If it's a properly aligned adress the bus logic first tries a word, if that isn't responded on by a device accepting the word bus request, it just does the bytes requests. Unaligned ones always get split up as far as I know.

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