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Re: Microvision Emulation Status [Re: judge] #92619 01/29/14 08:02 PM
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Olivier Galibert Offline
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Originally Posted By judge
We should add a proper implementation of the lcd driver


I'm curious, what do you think that would entail?

OG.

Re: Microvision Emulation Status [Re: ssj] #92622 01/29/14 09:09 PM
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judge Online Content
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At least making it a reusable part so it can be reused if we find something else that uses the same chip.

Re: Microvision Emulation Status [Re: Robbbert] #92630 01/30/14 07:40 AM
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Originally Posted By Robbbert
For some reason, pinball and vegas slots output to the LCD in a different way from the standard.


Actually it is bowling, and vegas slots. But I cannot update the other post.

Re: Microvision Emulation Status [Re: Robbbert] #92636 01/30/14 11:32 AM
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seanriddle Offline
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Originally Posted By Robbbert
Originally Posted By Robbbert
For some reason, pinball and vegas slots output to the LCD in a different way from the standard.


Actually it is bowling, and vegas slots. But I cannot update the other post.

The TMS1100s in Bowling and Vegas Slots have a different O PLA than the other games. There are 8 O outputs, but they are decoded from the status latch and 4-bit O register. To complicate things further, the decoder only has room for 20 of the 32 possible values. The example in the Programmer's Reference Manual shows 0-F decoded to display on a 7-digit LED when SL=1, and the 4 bits transferring out unchanged when SL=0. The Microvision carts just transfer the O bits out directly, but Bowling and Vegas Slots reverse the order of the bits for some reason. Pinball's O PLA is different from the others, but works the same as Blockbuster.
www.seanriddle.com/blockbusteropla.jpg
www.seanriddle.com/vegasslotsopla.jpg
www.seanriddle.com/pinballopla.jpg


Re: Microvision Emulation Status [Re: ssj] #92709 02/04/14 08:46 PM
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seanriddle Offline
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I picked up an Alien Raiders cart and dumped the ROM. It has the same O PLA as Bowling and Vegas Slots, and it uses the paddle. It's pretty fun to play, but it's tough. www.seanriddle.com/alienraiders.bin

Re: Microvision Emulation Status [Re: ssj] #92712 02/04/14 10:11 PM
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PaulRobson Offline
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Having written MV code it is conceptually more difficult on the 'normal' (e.g. 1-1) wiring in the PLA and all the graphics are backward. You think automatically most significant bit is right most ; on the Blockbuster PLAs it's the other way round.

Re: Microvision Emulation Status [Re: ssj] #92713 02/04/14 11:42 PM
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Congrats Paul on your RetroChallenge award!

http://www.wickensonline.co.uk/retrochallenge-2012sc/

Are you planning to start working on the Entex Select-A-Game right away? I have a collection for this system as well.

http://mbmicrovision.blogspot.com/2014/02/next-up-this.html

I found a couple of pages saying it uses an MCU, but none of them identified it. Is this known? Also, I found this system manual if anyone is interested.

https://archive.org/details/manuals-handheld-games-Entex-SelectAGame

Re: Microvision Emulation Status [Re: ssj] #92715 02/05/14 05:51 AM
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seanriddle Offline
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Handheld Museum says the Space Invader 2 cart, at least, is a Hitachi HD38800: http://www.handheldmuseum.com/Entex/SAG.htm

Not surprisingly, a 4-bit MCU like the TI TMS1100 and Sharp SM510. It also has a TEST pin, but I don't know if it works similarly to the TMS1100.

I guess these carts aren't as inexpensive as the Microvision carts (meaning destructive ROM dumping is out)?

Re: Microvision Emulation Status [Re: ssj] #92716 02/05/14 09:52 AM
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I've fixed things so that bowling, vegas slots, and alien raiders display properly, and therefore can be played.

This site shows how some games should look like:
http://home.comcast.net/~eichler2/microvision/MicroBowlSim.htm
(and you can play the games in your browser).

I'm a bit confused about alien raiders, i can see to press C to start, and E fires what i guess is a laser, but the laser doesn't destroy the aliens, and the game ends when one of them reaches the left hand side. Is that correct?

Re: Microvision Emulation Status [Re: ssj] #92717 02/05/14 10:15 AM
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seanriddle Offline
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That's what makes this one tough smile You have to use the paddle to make the laser the right length to hit the enemy; too long or too short and it doesn't kill them.

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