drovak
Posts: 2
Joined: Thu Oct 11, 2018 1:49 am

DEC VT520 Emulation

Tue Oct 16, 2018 2:58 am

I noticed that there is a partial VT520 emulation in MAME at the moment. Does anyone know what the status is?

I am contemplating trying to more accurately emulate the VT220/VT3XX/VT4XX family. Having not studied the architecture(s) of each well enough yet, I'm not sure how much from the 520 can be leveraged against the others yet. Any thoughts?

shattered
Posts: 7
Joined: Tue Nov 11, 2014 7:51 pm

Re: DEC VT520 Emulation

Wed Oct 17, 2018 8:07 pm

VT520 is a "skeleton" - such drivers are not expected to function at all, and serve mostly to document the ROM dumps. VT220, VT320, VT420 are skeletal as well. Getting a driver out of skeletal state can be a lot of fun -- it helps if you've done that before, though. Getting the emulated device pass its POST is a major step -- usually you have to figure out the memory and I/O device map, and connect interrupt sources.

VT100 and VT240 is working, with minor graphics issues, you can start from there. Bitsavers have technical manuals for both.

drovak
Posts: 2
Joined: Thu Oct 11, 2018 1:49 am

Re: DEC VT520 Emulation

Tue Oct 23, 2018 8:54 pm

Thanks for the info. Is this the pertinent place to discuss development, or is there another place for that?

shattered
Posts: 7
Joined: Tue Nov 11, 2014 7:51 pm

Re: DEC VT520 Emulation

Mon Oct 29, 2018 8:55 am

Yes, https://forums.bannister.org/ and #mame-dev on freenode are more active.

(There's also http://www.mameworld.info/ubbthreads/po ... rogramming that's less active)

Return to “MAME Discussion”

Who is online

Users browsing this forum: No registered users and 1 guest