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