first try DOSBox SVN

These are the DSP version values reported by DOSBox in its SB emulation:

1    case 0xe1:    /* Get DSP Version */
2        DSP_FlushData();
3        switch (sb.type) {
4        case SBT_1:
5            DSP_AddData(0x1);DSP_AddData(0x05);break;
6        case SBT_2:
7            DSP_AddData(0x2);DSP_AddData(0x1);break;
8        case SBT_PRO1:
9            DSP_AddData(0x3);DSP_AddData(0x0);break;
10        case SBT_PRO2:
11            DSP_AddData(0x3);DSP_AddData(0x2);break;
12        case SBT_16:
13            DSP_AddData(0x4);DSP_AddData(0x5);break;
14        default:
15            break;
16        }
17        break;

SB detection would be problematic in a significant number of games if the DSP versions were not reported correctly, so I suggest you look at what you may be doing wrong in reading the version data. It appears you're somehow using the minor version for the major version as well.

DOSBox does not install mixer ports for SB1 and SB2, so the mixer is absent for those types of emulated SoundBlasters, regardless of what you may be trying to infer from settings.

ripsaw8080 wrote:

These are the DSP version values reported by DOSBox in its SB emulation: […]
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These are the DSP version values reported by DOSBox in its SB emulation:

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1    case 0xe1:    /* Get DSP Version */
2        DSP_FlushData();
3        switch (sb.type) {
4        case SBT_1:
5            DSP_AddData(0x1);DSP_AddData(0x05);break;
6        case SBT_2:
7            DSP_AddData(0x2);DSP_AddData(0x1);break;
8        case SBT_PRO1:
9            DSP_AddData(0x3);DSP_AddData(0x0);break;
10        case SBT_PRO2:
11            DSP_AddData(0x3);DSP_AddData(0x2);break;
12        case SBT_16:
13            DSP_AddData(0x4);DSP_AddData(0x5);break;
14        default:
15            break;
16        }
17        break;

SB detection would be problematic in a significant number of games if the DSP versions were not reported correctly, so I suggest you look at what you may be doing wrong in reading the version data. It appears you're somehow using the minor version for the major version as well.

DOSBox does not install mixer ports for SB1 and SB2, so the mixer is absent for those types of emulated SoundBlasters, regardless of what you may be trying to infer from settings.

Do the emulated Sound Blasters types respond only to the DSP commands supported by the reported version, or do they respond to all?

Great Hierophant wrote:

Do the emulated Sound Blasters types respond only to the DSP commands supported by the reported version, or do they respond to all?

There are conditions that prevent processing of certain DSP commands on SB types that do not support those commands. See the DSP_SB2_ABOVE and DSP_SB16_ONLY defines.

Hello,

I don't think I'm doing anything wrong in my program, I double checked it, in doubt...

First I send the E1h command to the DSP, then I read twice one byte : first the major then the minor version.

Besides that, I can send DSP commands and hear sounds, no problem.

I'll try the SVN version too.

Thanks for these first answers !

Some years ago I made the attached C program to test DSP commands. It takes parameters of the SB base port and DSP command in hex and displays the response data. For example "SBDSP 220 E1" displays "04 05" for sbtype=sb16 in DOSBox. Perhaps you can compare the code to what you are doing to see why you're not getting the values you should be.

Eh, thanks, I will test that 😉

I forgot to mention I'm under Linux (Ubuntu Precise). Don't know if it makes a difference between the ports, I never tried to compile DosBox myself. Maybe I should have a look at the source code.

Mmmh... OK, my fault, it works now.

I wasn't using the right method to check if the DSP was ready to give an answer, ripsaw8080 your code helped a lot !

Now I can use the right commands for the right SBs, the Read_DSP portion of my code was only used for identifying --- the rest was working like a charm.

Thanks to you all.