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Looks like the chip on Mr. Do is a different pin count as well as different maker. I'm kind of surprised they didn't use the same chip on it.

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Huh, you're right... Didn't even think to count the pins, just kind of assumed... smile

Now I have to look at BMX Flyer and Thomas the Tank Engine to see what they look like...

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These things are all over the place...
BMX Flyer looks to be the same chip as Mr. Do:

But Thomas is using yet another chip, Oki M6502B-15

Looks like there's at least info on that one... 4-Bit CPU with built-in LCD driver.

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I found the datasheet for the MSM6502 (stupid OKI, reusing "6502") and the good news is it has no less than FOUR test pins. looks like 2 in, and maybe 2 out. The docs don't say a whole lot about it, but it does have a complete opcode listing with hex values so there is that.

It's a later sheet (1986) so it cuts out most of the more interesting parts, but I think there's enough there to go on.

Connecting to the QFPs is a pain because you have to make custom adapters- there's no ZIF sockets for most of these non-standard sized chips unfortunately.

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That was pretty weird to name it 6502! And 4 test pins is odd. Good luck!

I posted pics from the TMS1000 out of a Big Trak - www.seanriddle.com/tms1000.html

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When I decapped Electronic Talking Battleship, the die got stuck in the top plastic and I toasted it pretty badly trying to get it free. Unfortunately, Whink didn't clean it up very well. The ROM bits look like they are possibly a little small for me to read anyway. It looks like 8K of ROM. Here are a couple of 5Kx5K GIMP files:
www.seanriddle.com/electalkbshipmetal.xcf

www.seanriddle.com/electalkbshipacid.xcf

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I re-dumped Coleco Galaxian. The ROM matches the existing dump.

I also finished vectoring a couple more games.

The new games are here:

http://blog.kevtris.org/blogfiles/Handhelds/Mattel%20Starhawk/
http://blog.kevtris.org/blogfiles/Handhelds/Mego%20Breakfree/
http://blog.kevtris.org/blogfiles/Handhelds/Tandy%20Caveman/
http://blog.kevtris.org/blogfiles/Handhelds/Tomy%20Scramble/

Looks like I got around 11 more games left to do after this.

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Nice! =) +thanks for double-checking Galaxian.

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hap: no prob. what does galaxian do? it just doesn't run?

btw galaxian does something neat with the VFD. when something blows up, it will stop scanning the grids and turn the grid on that is over the object that is blowing up, and hold it there for awhile. this makes it light up really bright for 100-200ms.

so far this is the only game that does that.

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Galaxian: sprites flicker, sound zooms/glitches, and eventually it resets itself and does the same again. Unable to start the game.

The brightening trick is pretty common on LED games. =)

sean: what hw revision Big Trak is yours? Or will you post that in a hw/pinout info txt later?

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