HP110+ upgrade DOS2.11 to DOS6

[time27]

Hi
Thanks for the thought

I looked at the software draw and I think the MS DOS is hiding in the main ROM.
To get to the that ROM I will have to take the HP45711 mother broad out and identify the ROM chip. I have 2 of those HP110+ computers.

Tried everything in way of loading an OS. so far but best option would be ROM based DOS5 as it has many extras such as ANSI.sys.

Alternative would be to create an edsk.sys command.com (DOS 5 ) and a path by creating a config.sys and autoexec.bat.

Many users of HP110+ have taken the path of creating a EPROM programs for images taken from a EDRIVE after trying software like "Pascal". If I can successfully boot from any other drive using config.sys and autoexec.bat creating an alternative path I can only imagen a success. I hope.

I noticed that after an alteration to memory size HP110+ reloads the DOS from B:\BIN\ directory...it also reads root dir of all the drives looking for config.sys before it loads the OS from a default location, If I can fool it once to use a different path I can perhaps load a command.com of DOS5. Alternative is fining a factory ROM on the motherboard and reprograming it.

Those are my thoughts on software before I am let loose on hardware with a soldering iron.
If you had hardware expereince with the HP110+ MB expereince is welcome.

Regards Nick