I got the new batch of games today. On first impressions, there's some weird stuff in here.
Amidar uses an M81503-702SP which is similar to the chip on frogger, but is in a shrink dip package- a 56 pin sdip. This is an odd package size. I'm sure it probably dumps the same way so I most likely can extract it's programming goodness.
The other issue with this game is the VFD has the white "grid" pattern of amidar printed onto the filter. This is going to make vectoring it difficult because the lines obscure the VFD glyphs head-on.
I didn't even open Amidar or Jungler, but surprised they used different chips than Dig Dug...
What is the grid printed on? Directly on the glass, or on the color overlay? If it can be peeled off, you can go ahead and do that...
Bandai pair match has TWO HD38820's in it. One runs the game/VFD and the other does nothing except make sounds. Almost all of its IOs are NC. There's a 4 bit bus and 2 or so control signals between the two.
Yeah, that one surprised me when I opened it... But hey, at least the VFD is REALLY easy to vector.
Bandai zaxxon has a mirror above the VFD so that the two halves of the VFD are "overlapping" each other for a 3D effect. Half the VFD glyphs are reversed because of the mirror.
Yeah, that's done to create the illusion of 3D, half the glyphs are overlayed on the other half. Maybe for emulation that will have to be treated as two VFDs on top of each other?
Coleco Zaxxon is similar, but it really does have two VFDs. Using a mirror, your ship (all on one VFD) is super-imposed on everything else. These might be interesting to emulate... Not sure if that makes it harder, or just 'different'.
Bandai ultraman has a very difficult to vector VFD, I might have to let that one go, at least for now (or someone else is welcome to do it :-)
Haha, I warned you about that one! There's one more in that series too which is probably just as annoying... We can at least get it dumped, photographed and emulated... Figure out the graphics later, there's plenty more in the mean time.
I'll send some 'less interesting' ones next time around.