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