Distro SuSE Linux 9.3 Eval copy.
Installed on: DELL desktop, works fine
Toshiba Tecra M2 double boot XP/Linux
The notebook installation seems to work fine except for the printing. The printer is a HP LaserJet 4L on the parallel port. Works fine in XP. Linux doesn't detect the printer. With the port set to ECP in the BIOS there is a message that CUSP doesn't accept jobs. Changing the port setting to standard biderectional all error messages disappear but no printer is detected. The print job is launched o'kay but nothing happens at the printer.

Try configuring the printer in Yast - Hardware.

I have done that setting the port to 0x378

The solution is as follows.
At boot enter BIOS with CTRL+ESC, which is not documented in the Tecra manual that comes with the machine (I found it on the net). Go to the parallel port setting. There are four alternatives:
a) NOT USED
b) LPT1(378H/IRQ7/CH3)
c) LPT2(278H/IRQ5/CH3)
d) LPT3(3BCH/IRQ7/CH3)
The factory setting is NOT USED. That doesn't affect Windows XP (the machine is dual boot) but Linux never sees the printer. Changing the setting to alternative b) I could configure the printer HP Laserjet 4L in Yast. The test printings I have made worked correctly. There is no apparent adverse effect, when booting up in XP. System information doesn't report any irq conflict, irq7 is not listed as used and the printer works normally here too.

Glad you found your problem, thanks for sharing the solution. I never would have thought of that. Unless it saves battery, it make no sense and is a guaranteed support call.