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Question: Which peripheral would you most like for the Videopac7000/Odyssey2?
Trackball
Mouse
Printer
High score save device
Pause game device

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Author Topic: Add on's  (Read 28704 times)
Rene_G7400
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« Reply #105 on: December 29, 2009, 12:22:34 PM »

In the case of the examples yes. But if other leds could be on at the same time, it could be more usefull. For example someone decides to make a new game like Cosmic Conflit where you can see with the leds where are located the enemies out of screen, or  a game where some leds on will indicate the items the player is carrying.

If only one LED needs to be on at the same time it's easy (electronically), requiring 4 or 5 small IC's for a maximum of 127 LEDs (8-bit latch: 74LS377, 4-to-16 decoder: 74LS159, 3-to-8 decoder: 74LS138, inverting buffers: 74LS240, and maybe one IC with a few gates.)

Letting the 8048 do the multiplexing will be impractical, so if more LEDs need to be on at the same time it will be more difficult, requiring a small RAM chip instead of the latch, and an oscillator, a counter, a data selector (for the address bus), and a 3-state buffer (for the data bus).
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Seob
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« Reply #106 on: December 29, 2009, 04:24:05 PM »

Yep, here is somebody talking in binary code to me.
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Rafael
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« Reply #107 on: December 29, 2009, 04:53:04 PM »

Yep, here is somebody talking in binary code to me.

Same to me Smiley
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Rafael
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« Reply #108 on: December 29, 2009, 04:54:44 PM »


If only one LED needs to be on at the same time it's easy (electronically), requiring 4 or 5 small IC's for a maximum of 127 LEDs (8-bit latch: 74LS377, 4-to-16 decoder: 74LS159, 3-to-8 decoder: 74LS138, inverting buffers: 74LS240, and maybe one IC with a few gates.)

Would you like to try it Huh?
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Rene_G7400
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« Reply #109 on: December 29, 2009, 08:04:03 PM »

If only one LED needs to be on at the same time it's easy (electronically), requiring 4 or 5 small IC's for a maximum of 127 LEDs
Would you like to try it Huh?

Do keyboards like that already exist? Because I don't like to solder 127 LEDs...
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Rafael
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« Reply #110 on: December 29, 2009, 08:50:04 PM »

No, just a experience with an existent game. Tutankan for example?

I was making a led matrix research and for some reason I loved that Cheesy

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Rafael
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« Reply #111 on: December 30, 2009, 12:39:48 AM »

 here?s a quick scheme how Moto Crash could work.
It?s like a 80?s GPS Wink
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Rene_G7400
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« Reply #112 on: December 30, 2009, 06:15:38 PM »

I was making a led matrix research and for some reason I loved that Cheesy

Very nice display!!  Smiley

I've found a more simple display which will be suitable for experiments, I'll just need two of those for a 16x8 LED matrix.


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Gorf
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« Reply #113 on: December 31, 2009, 08:25:38 PM »

Hey guys!

Sorry I've been away for a while. Im glad to see some of you still rolling along with add on ideas and projects.

Hey Rene, The last message I read was about how you got that ROM lookup circuit to actually work.
It seems the link to the pic is broken. I since had a few HD crashes and other problems keeping me away.

I've been workin of some 7800 games in the mean time but would love to get back to some simple O^2
games again.
Well Happy New Year every one and I hope to pop in more often.

Gorf
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Rene_G7400
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« Reply #114 on: December 31, 2009, 10:56:37 PM »

Hi Gorf, great to see you're back!
My homepage provider has changed it's name, so in my links you should replace "hetnet" by "kpn".

I suppose this is the pic you were looking for?

http://www.ozyr.com/rene/Download/O2-table-rom_CE.gif
« Last Edit: December 31, 2009, 11:06:16 PM by Rene_G7400 » Logged
Gorf
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« Reply #115 on: January 01, 2010, 02:41:28 AM »

Hi Gorf, great to see you're back!
My homepage provider has changed it's name, so in my links you should replace "hetnet" by "kpn".

I suppose this is the pic you were looking for?

http://www.ozyr.com/rene/Download/O2-table-rom_CE.gif


Yep! that's the one!

I still want to add a new graphics chip to the O^2 add-on. Im thinking along the lines of a TI
TMS9928. IT would be nice to have all those sprites and graphics capabilites. I know you guys
love your G7400 but Im not too impressed with the lack of sprite expansion. Shoot, I may throw
a Z-80 out there just to help make the graphics more easy to deal with so the 8048 can conen-
trate on game logic and AI. Im also disappointed in the inability for characters to overlap each other.
this really puts a damper on games with more than 24 objects moving on screen.







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Rene_G7400
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« Reply #116 on: January 01, 2010, 04:08:04 AM »

TMS9928 and Z80, that sounds familiar. Colecovision and MSX both use these chips. Have you already written games for these consoles/computers?
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Gorf
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« Reply #117 on: January 01, 2010, 05:55:06 AM »

TMS9928 and Z80, that sounds familiar. Colecovision and MSX both use these chips. Have you already written games for these consoles/computers?


No but there are plenty of development tools to help us. Hey, we might have an easier time
porting some of those old MSX titles to the O^2. However, I was not considering worrying
about MSX compatibility....I was thinking of using the z80 soley for a VDP control processor
so the only burden it would ever have is graphics rendering while the 8048 did all the game
logic an AI. This would make it rather more powerful than an MSX in that the z80 would only
be used for a single task...heck we could even throw out some nice simple sound chip for it to
manipulate as well, then the 8048 can just concentrate on the game side of things and simply
signal the z80 to do any gfx/sfx.
« Last Edit: January 01, 2010, 05:27:12 PM by Gorf » Logged
Rafael
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« Reply #118 on: January 01, 2010, 02:24:04 PM »

...heck we could even through out some nice sound chip for it to
manipulate as well

Hi Gorf, nice to see your back Wink. Sound is in my opnion the weak part o f the Ody, so it could be great.
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ANDYRYALS
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Oh Bollocks can I afford that Ebay item?


« Reply #119 on: January 01, 2010, 03:59:53 PM »

welcome back Gorf!
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I have 12"
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