My M8189 came with unlabeled 2716 EPROMs. I don't know what version
that was. I don't think it could boot from MSCP. That would match
what Pete says.
Unless I missed it all of the M8189 versions listed here are 8K
versions, not 2K versions:
http://www.dunnington.u-net.com/public/DECROMs/ROMlist
I updated my M8189 to the 23-380E4 / 23-381E4 M8189-BG (or -BH)
version. The only trick is you need to find 24-pin MCM68766 8KB
EPROMs, which aren't as common or cheap as most other EPROMs.
-Glen