Plus can't really be considered a sequel but more of a software upgrade to the
original. Assault Plus was only released in Japan and it is assumed that
it came as a kit. I've never seen an Assault Plus cabinet or marquee to
think any differently but who knows. There aren't many resources about
this game on the web.
Additionally, on the "Namco Museum Volume 4" for the Sony Playstation there is
an un-lockable that allows you to play Assault Plus. Check out the
Assault Home World
for additional info and screen shots.
There is a a
limited-edition soundtrack album for Assault (Namco Video Game Graffiti Vol.3 -
VDR-5278) that was released in 1988.
Assault Plus Upgrade
If you have an Assault PCB,
replace Assault's AT2MP0B and AT2MP1B with Assault Plus MPR0 and
can burn these chips very reasonably and installation is easy.
Intro now has music
Enemy Strengths and Colors were changed
2 Skill Levels of play are now available
Zero point glitch has been corrected
Cocktail Table Mode