Home Page Forums MAME MAME 80186 emulation

Hi all,

Can anyone tell me if the 80186 CPU emulation also emulates the built in periperal chips such as the DMA controler, timer/counter and address select unit ?

Or does it only emulate the processor core ?

Cheers,

Phill.

No, it emulates just the processor core, and iirc the version you are referring to is the AM186-EM / AM188-EM?

The peripherals were part of the original Intel 80186.

A good chunk of the peripherals are implemented in mame/audio/leland.c. Using that as a starting point would be a good idea.

That code looks very like the code in the mess compis driver, which I saw after posting my original query. I used that as a base.

I'm trying to reverse engineer the RM Nimbus 186 based PC, unfortunatly I don't have any documentation for the hardware, fortunatly I do have 2 working machines

Cheers,

Phill.

Awesome! I've actually been looking for an RM Nimbus to dump the roms from as I used many when I was at school.

They are kinda PC compatible but not fully, I remember them running a version of windows 3.1 for workgroups, a port of access and some RM logo app.

I guess I can call off the search now, thanks

Yes, the code was copied from the leland driver. However, it should have been cleaned up and also separated to a 186/188 module.

***AND*** It should have meaningfull variable names in update_interrupt_state and handle_eoi for example, using i and j for the loops only serves to obscure the function of the code where something like priority and int_no would make much more sense.

Cheers.

Phill.

Feel free to fix it. I defer to your superior coding style.

I have in the rm driver

Phill.