digger wrote on 2025-04-01, 08:26:

So how is a parallel port registered to be accessible on device name LPT4 in DR DOS and Novell DOS, if the BDA can't facilitate that?

Hi, that's what I've found so far..

"LPT4 is an optional built-in driver for a fourth line printer supported in some versions of DR-DOS since 7.02."

https://en.wikipedia.org/wiki/DOS#Reserved_device_names

"LPT4 (some versions of DR-DOS 7.02 and higher only[8])
Enables, defines count and logical order and configures I/O address and timeout for LPT4: device."

https://en.wikipedia.org/wiki/CONFIG.SYS#LPT4

"Further, it provided optional support for a LPT4: device and allowed to configure the built-in COMx: and LPTx: devices as well as to change the PRN: and AUX: defaults."

https://en.wikipedia.org/wiki/DR-DOS#After_Novell

New revision finally ready and available :
Limited Purple PCB 'Vogons Edition'

Very nice! I plan to alter the AIL2 driver for Tandy, so it supports the TNDLPT directly (no need for TSR's).

And i have some even better news, but that on its own thread....

Now also the 3d printed case is ready

dreamblaster wrote on 2025-08-12, 17:29:

Now also the 3d printed case is ready

Got mine! Thank you for making these again 😀

Recently I bought TNDLPT and I wonder there is any way to mute TNDLPT in Windows XP or higher.
I found TNDLPT output unwanted sound (noise) when booting until loading driver or running TNDRESET.EXE.
(When power-on there is no sound at first but it starts to output noise when starting to boot DOS until loading TSR or running TNDRESET.EXE)
For DOS, it has little problem. Noise can be stopped in very short time by loading driver or running TNDRESET.EXE in AUTOEXEC.BAT
But TNDRESET.EXE does not run in Windows XP or higher. I wonder if there is any way to reset TNDLPT in Windows XP or higher.

Thanks

I’m glad to say there’s now an AIL2 (TANDYLPT.ADV) dedicated driver for the Serdaco TNDLPT parallel port device. It eliminates the need for redirection TSR and it also does device initialisation.

I also started experimenting patching some games, and managed to patch 2.917 AGI interpreter, and one Tandy driver for SIERRA SCI0 engine.

Alas, patching games for the TNDLPT, is quite a bit more impractical than what i did for Tandy ISA cards. Not only an OUT routine for the parallel port is more involved, it also requires maybe using a separate tool (like pdw’s TNDRESET) to initialize the device. Including initialization for each game would take even more space, so honestly the INT C0h trick and a INT handler is the more elegant solution in this case

carlostex wrote on 2020-10-05, 12:11:

Everything uploaded to the Tandy repo at ftp.oldskool.org. Readme was updated too.

The games-section is for the ISA tandy-sound card and not for tndlpt (without tsr) right?
http://ftp.oldskool.org/pub/TandySoundPatches/Games/

The games section are the old patches that need redirection. You can use them for TNDLPT but you need the TSR utility.

If you back to the previous directory you'll find the tndlpt directory that outputs directly to TNDLPT.

As you know my setups avoid or do not support emm386 (PS/2E and EuroPC/XT), so no TSR.
Is it easier to start from scratch to try to port games to PICOVOX (opl2/cms/tnd) or are the already routed games to ISA-tandy sound device the better starting point ?
tndlpt is "only" AGI and I already patched them to PICOVOX-tnd-mode on my EuroPC. (278h) I have to figure out if my setting on the PS/2E (LPT2 afair) also 278h is or something else. We will see.
I was also thinking about CMS support on some games... If the AI was clever it could do it...

Best solution for you is the INT C0h trick. Direct patching for TNDLPT requires a lot of bytes and that is just impossible. AGI is possible because it has enough space for it. 99% of games do not.

OK thank you, the project is on halt. the machine is broken, if the PS/2E can be repaired is unclear, because I did not find the error that prevents the machine from booting anything.
thanks Carlostex for your support, I really appreciate it.