!CE and the Radica

Post by **gannon** » Tue Jun 13, 2006 8:14 pm

Just wondering if other people think it's plausible to use the extra ground lines in a cart and a 4066 to toggle !CE on the cart slot and rom chip. Just thinking of ways to keep the chip in the radica to have games without a cart too

Post by **marshallh** » Tue Jun 13, 2006 8:23 pm

If you're the one asking the question, I don't think you'll get much of a response, considering you're way ahead of most everyone else...

But why not use a physical switch? a 4066 seems kind of redundant. All you're doing is toggling the chip enable, right?

For those who are wondering what a 4066 chip does:
http://www3.sympatico.ca/lloyd.gordon3/images/4066.pdf

Post by **gannon** » Tue Jun 13, 2006 8:31 pm

well, because this is automatic!
And that's always better, not only do I have to remember to flip the switch, but I'd also have to mount it

G-force · Post by **G-force** » Tue Jun 13, 2006 8:35 pm

You could always have the cartridge hit a lever switch when you insert it. Thats what I did with NES p0cket to switch from built-in games to cartridge, and it worked great.

Post by **gannon** » Tue Jun 13, 2006 9:30 pm

oh yeah, and here's a schematic of what I'm thinking:

timmeh87 · Post by **timmeh87** » Tue Jun 13, 2006 9:46 pm

so wait... is this chip just a bj transistor array, or is it using relays or fets or something?

why not just use a mosfet? smaller. cheaper?

Post by **gannon** » Tue Jun 13, 2006 9:55 pm

I have 4 4066 chips, and they're only 14 pin dips. Also, they're only $0.35 each on jameco.

vskid · Post by **vskid** » Wed Jun 14, 2006 7:01 am

G-force wrote:You could always have the cartridge hit a lever switch when you insert it. Thats what I did with NES p0cket to switch from built-in games to cartridge, and it worked great.

I think thats what the GBA does to tell that you put in a color game.

Post by **Skyone** » Wed Jun 14, 2006 8:35 am

vskid wrote:
G-force wrote:You could always have the cartridge hit a lever switch when you insert it. Thats what I did with NES p0cket to switch from built-in games to cartridge, and it worked great.
I think thats what the GBA does to tell that you put in a color game.

No, they use a CMOS chip.

Here's my idea:

Since there are multiple Vcc points on a cart, only apply Vcc (3.3v/5v) on one pin on the cart slot. On another Vcc pin on the cart slot (that's not being used, not attached to anything,) there will be 0v if a cart is not inserted, and 5v if a cart is inserted, right? Somehow intergrate that with a CMOS switch or transistor switch.

vskid · Post by **vskid** » Wed Jun 14, 2006 8:42 am

Skyone wrote:
vskid wrote:
G-force wrote:You could always have the cartridge hit a lever switch when you insert it. Thats what I did with NES p0cket to switch from built-in games to cartridge, and it worked great.
I think thats what the GBA does to tell that you put in a color game.
No, they use a CMOS chip.

Well, what does the switch do then?

Post by **Skyone** » Wed Jun 14, 2006 3:58 pm

vskid wrote:Well, what does the switch do then?

What switch?

vskid · Post by **vskid** » Wed Jun 14, 2006 4:24 pm

Skyone wrote:
vskid wrote:Well, what does the switch do then?
What switch?

On the GBA cart slot, it is only pushed down with GBC carts.

Post by **Skyone** » Wed Jun 14, 2006 4:29 pm

Woah! Never noticed that! Thanks for pointing that out!

vskid · Post by **vskid** » Wed Jun 14, 2006 4:33 pm

Skyone wrote:Woah! Never noticed that! Thanks for pointing that out!

Now that we know what each other are talking about, I'm still clueless as to what it does.

Post by **Skyone** » Wed Jun 14, 2006 5:02 pm

The switch is simply a physical switch that changes the loader. Take a pencil and press down on the switch. While holding the switch down, turn on the GBA/SP. It starts up the GBO/GBC dashboard.