Re: SBEMU: Sound Blaster emulation on AC97
Posted on Today, 13:31
Is there any differences between the latest official "1.0-beta4" build and "UserBuild_2024.04.29_09-29" which is also dubbed "beta4" in the CHANGELOG.TXT?
Re: SBEMU: Sound Blaster emulation on AC97
Posted on Yesterday, 14:40
georgel wrote on Yesterday, 14:30: Then why some sound blasters are experiencing DMA cracking bug, others are not 😉 ? There are different versions of the DSP. Some of them have this bug, but other don't.
Re: SBEMU: Sound Blaster emulation on AC97
Posted on Yesterday, 10:51
Yeah, but I'm not surprised that SB16 is very well emulated, I just thought that CMI8738 SB16 emulated sound quality is worse than one of the original SB16 card because of the hardware. And it turned out that it is not :) I also wanted to check what the original hardware settings were on the SB16, …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on Yesterday, 10:05
Just for the experiment today I dug up my old ISA SB16 semi-P&P card (it is set trough jumpers, but needs DOS initializer/"driver"). Default settings through jumpers for this soundcard are IRQ 5, LowDMA 1, HighDMA 5, I/O address 220 and MPU-401 I/O address 330. Surprisingly to me the original SB16 …
Re: Xcom (for DOS)
Posted on 2024-04-29, 10:11
igna78 wrote on 2024-04-28, 16:35: A lot of time has passed since the last news given by the author of Xcom, the website is now unreachable: what happened? I think nobody here knows what happened. The Xcom's site just disappeared from the web space a coupule of months ago.
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-29, 08:18
BTW you can try the /SCFM1 to use hardware FM for the CMI instead of software FM emulation, it may get a performance boost and help with the choppy. But note that some CMI cards don't have HW FM, you may need to test it out. Great! I'll try this with the latest build. If I remember correctly the …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-29, 06:30
crazii wrote on 2024-04-29, 06:10: Do you mean the IRQ10 problem? Yes, they do. actually it's not CMI only, the emulation code has bugs on all cards. Yeah, the problem with interrupt and DMA. I'll test the latest github build later.
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-29, 05:34
PM sent, please check. I'm not sure if it is what you need/want. :D Thank you! Actually it is what I need. At least as a some starting point and guidelines :) I just saw that you have some newer builds from UserBuild_2024.04.27_03-42 on the girhub. Do they include the fixes for the CMI8738 chip …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-28, 07:00
I didn't do 'low-level' programming back in the day either. I read some beginner books on QBasic and FOXBASE+ in junior high, and later had fun with Turbo C - That was a time I was playing DOS games with little knowledge about sound cards or video cards. One of the most helpful was the built-in …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 14:31
wierd_w , I fully agree with your point. My current SBEMU on CMI8738 test system does not have any PCI or ISA NIC adapter installed, so I decided to use interrupt 5 over 7 for the SB16 emulation as it is completely free. If I add some NIC adapter I may switch to default interrupt 7 for the SBEMU. …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 13:01
Yes, that check is added just now, as previously noted here: EDIT: additional checks added if HDMA is less than 5, then Dx and Hx must be the same, in your case SBEMU will set H3 to H1. (or set D1 to D3 will work too). Great, but I meant some more detailed checks according to SB emulated card. As …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 12:17
Excuse me, wierd_w , for I'm a simple person and I can't recall all the correct SB DOS settings from about 30 years ago :) So far, good news with the latest SBEMU build UserBuild_2024.04.27_03-42 and "SET BLASTER=A220 I5 D1 H5 T6 P330" (I prefer interrupt 5 over 7, because on my test system 7 is …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 10:51
OK, H3 is 16bit data through 8bit channel. usually you should use 5,6,7 only for high dma. and it seems TR1 only recognize 8bit low DMA, when you set H5/H6/H7 it will detect D1 properly. if H3 (other than 5,6,7) is used, TR1 won't detect it as high dma H3, but low dma D3 and cause problem, so I …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 10:08
That's really strange, I tested the auto detection and it works as expected, and manual config also works. Do you set BLASTER env before running SBEMU? or after it? if so, what the settings? if no, what the BLASTER env set by SBEMU after it installs? FYI I didn't set BLASTER env before SBEMU, nor …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 09:38
crazii , so far no good news. And I'm too confused now. It seems like this last build got worse in terms of sound quality with CMI8738. Still no proper autodetection from TR1's SETUP.EXE - seems like there's improvement with interrupt detecting, but sill autodetects HighDMA (3) instead of DMA (0 or …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-27, 07:50
I just debugged with TR1, it assumes the card is SB16/AWE and read IRQ/DMA from the mixer registers (80h&81h), but mixer reset code doesn't set those two. You can try this build with the problem fixed: https://github.com/crazii/SBEMU/releases/tag/UserBuild_2024.04.27_03-42 I'll try this build today …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-26, 16:14
Who knows if the compiled executable will be compatible with P1 non-MMX, PPro or non-P1 MMX (for example AMD K6) CPUs when "march=pentium-mmx" flag is used.
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-26, 14:45
`JEMMEX NOVCPI` is needed AFTER installing SBEMU, probably set in autoexec.bat I'll investigate the problem with my CMI cards with TR1. Ok, I'll try with JEMMEX NOVCPI in the command prompt after all the DOS boot initializations, just before I run DOS/32A modified SETUP.EXE. I just found another …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-26, 13:08
crazii , I tried the SBEMU version form the github-link you gave me and unfortunately the problems with proper initialization of SB emulation in CMI8738 soundcard are same. Later I'll upload pictures with some explanations, but I'm thinking there are mainly problems with DMA channel and interrupt …
Re: SBEMU: Sound Blaster emulation on AC97
Posted on 2024-04-26, 12:58
DOS32A can be configured via command line switch or by other means too (its configuration utility) to use DPMI first. Unfortunately in DOS/32A version package which I have (one of the latest if not the last) ss.exe's option for selecting DPMI detection over VCPI is deprecated and non-functional: …
Page 1 of 30