Awesome! I was just about to order a bunch of your parallel sound-cards for a project (writing sound code for a dos game, and I need to travel light). I'm really looking forward to this one. 😊

Any news on a release date for this? I’m holding off a couple of other purchases while I wait.

lvader wrote:

Any news on a release date for this? I’m holding off a couple of other purchases while I wait.

Hey, don't hold your breath !
Hardwarewise I have some prototypes ready, with the new 'muting at bootup' feature.
but still needs more TSR debugging and testing.
Feel free to PM me if you are interested in early access.

whats the difference beetween the new and my old prototyp ? 😀 maybe i can add the "change" to the pcb.

matze79 wrote:

whats the difference beetween the new and my old prototyp ? 😀 maybe i can add the "change" to the pcb.

The new PCB has an optocoupler for interrupting the power to the chip, until it is initialized by the TSR.

so the new tsr will still work with my prototyp ? 😀

time to try it 😁

EDIT: TSR loads, silencing works. but then no sound anymore.
i used EMM386. Seems EMM386 is still not working ? 😀

Now trying QEMM.
EDIT: QEMM is still fine 😀
But still slow on LowSpec Computers.

-> 386SX 16/20/25

https://www.youtube.com/watch?v=66oqgOt0BSw

Tandy LPT Soundcard running with QEMM386 free Driver, still Experimental.

There still glitches, some delays.

QEMM386 free TNDLPT Driver is in works, but its still experimental:

https://github.com/JKnipperts/TNDY

TNDLPT revision on its way, with huge thanks to Matze79 for the help with a muting solution !

preliminary device view : https://youtu.be/70jKmkNw2Wo
brief test (not final) : https://youtu.be/G-YbB-ANSp0

If you developed software for TNDLPT, please add this initialisation :
Pin CE must be 0 and Reset must be 1 for at least 100ms at init, to unlocking the mute state after startup.
This should be backwards compatible with older TNDLPT.

Can you summarize the overall programming technique for the TNDLPT?
Most importantly: How do I enable it and how do I write a byte?

Benedikt wrote on 2020-03-07, 20:25:

Can you summarize the overall programming technique for the TNDLPT?
Most importantly: How do I enable it and how do I write a byte?

For what development environment ?
Maybe should make a small 'programmer's guide' (it will take some time)

I am mostly interested in the sequence of instructions that is equivalent to "out 0c0h,al" on a Tandy, because that is presumably the biggest difference.

Benedikt wrote on 2020-03-07, 23:13:

I am mostly interested in the sequence of instructions that is equivalent to "out 0c0h,al" on a Tandy, because that is presumably the biggest difference.

The equivalent is something like this:

1  int lpt_stat = lpt_port + 1;
2  int lpt_ctrl = lpt_port + 2;
3  outp(lpt_port, cmd_byte);
4  outp(lpt_ctrl, 0x0C);
5  int wait = 24;
6  while (wait > 0) {
7    if ((inp(lpt_stat) & 0x40) == 0) {
8      break;
9    }
10    wait--;
11  }
12  while (wait > 0) {
13    if ((inp(lpt_stat) & 0x40) != 0) {
14      break;
15    }
16    wait--;
17  }
18  outp(lpt_ctrl, 0x09);

(It's long, because we need to explicitly wait until the sound chip is done processing the command. That's hidden and implicit on the Tandy.)

For unlock, Pin 17 and Pin 1 should be in this state:

I using ATTiny13 AVR for unlocking/muting and control LEDs.
Muting is done by using ByPass Pin of LM386.

As I try to follow through threads here
I really wish folks would never use 3rd party hosting, half the threads are incomprehensible because of this image in place of every photo

yeah that really sucks, it would be great if vogons disables external images and forces users this way to upload them here.

Easy unlock for new TNDLPT:

debug.exe
-o 37A E5

pdw wrote on 2020-03-08, 14:31:

The equivalent is something like this: […]
Show full quote

Benedikt wrote on 2020-03-07, 23:13:

I am mostly interested in the sequence of instructions that is equivalent to "out 0c0h,al" on a Tandy, because that is presumably the biggest difference.

The equivalent is something like this:

Copy code to clipboard

1  int lpt_stat = lpt_port + 1;
2  int lpt_ctrl = lpt_port + 2;
3  outp(lpt_port, cmd_byte);
4  outp(lpt_ctrl, 0x0C);
5  int wait = 24;
6  while (wait > 0) {
7    if ((inp(lpt_stat) & 0x40) == 0) {
8      break;
9    }
10    wait--;
11  }
12  while (wait > 0) {
13    if ((inp(lpt_stat) & 0x40) != 0) {
14      break;
15    }
16    wait--;
17  }
18  outp(lpt_ctrl, 0x09);

(It's long, because we need to explicitly wait until the sound chip is done processing the command. That's hidden and implicit on the Tandy.)

That looks simple enough. Thank you!

a small amount of TNDLPT solder kits will be available soon,
pm me if interested, to receive one of the first kits.

Here's a photo of the most recent TNDLPT prototype.

Now I am waiting for the black color pcb's to arrive

Fancy.