DOS Guest and LPT port

[trippingslowly]

I have a DOS 6.22 guest on Windows 10 host. I followed this guide to enable a LPT port on the VM: viewtopic.php?f=24&t=54187

Specifically (substituting my VM name in the quotes):

Code: Select all

VBoxManage modifyvm "My VM Name" --lptmode1 "LPT1:"
VBoxManage modifyvm "My VM Name" --lpt1 0x378 7

However, when I boot the VM, MSD reports 0 LPT ports. Using the same procedure on a WinXP guest does result in a LPT port appearing in Device Manager.

Has anyone had success installing a LPT port in a DOS guest?

[mpack]

I can't think why that should be. VirtualBox is a hardware simulator, not an OS simulator - the OS is real, and if one OS detects the hardware then any others should detect it too. I wonder if it's the type of parallel port that is the issue (e.g. legacy vs EPP vs ECP)? VirtualBox seems to emulate the latter, which is the newest variant. I know nothing about parallel ports, but I would have expected the register API to be backwards compatible.

[trippingslowly]

Thanks for the reply. I tried again and instead of MSD, I used NSSI and it did successfully detect the LPT port under DOS.