toggle between rom chips?

glassonion914 · Post by **glassonion914** » Thu Sep 15, 2005 11:49 pm

I would be happy if my portable had only the 12 games from radica #1 and #2, do you think it's feasable to to wire the radica to a new board with roms from both radica 1 and 2 and toggle between them with the ground (1st position on the rom if i'm correct) instead of to a cartridge slot - or maybe a third toggle position for a cart slot...
I've sold all my genesis everything through the years, sadly, and I've bought radica's 1 and 2 for cheaper than 6 games.

matt

daguuy · Post by **daguuy** » Sat Sep 17, 2005 9:35 pm

this should work

incase you're wondering, the wires go to the ground spots on the chips and cart slot

Post by **gannon** » Sat Sep 17, 2005 10:14 pm

if there are multiple grounds on the cart slot you could build an auto-switch between int. and ext. games.

atkafighter · Post by **atkafighter** » Sat Sep 17, 2005 11:10 pm

Thats a really good idea! I might buy the Street Fighter , and Red versions and build one.

glassonion914 · Post by **glassonion914** » Sun Sep 18, 2005 4:41 am

I saw some talk on this topic in an earlier thread, but I want to get into it more.
Now I'm thinking leave rom 1 in there, solder wires from its leads to rom 2 shoved elsewhere and I'd only put a switch on their ground wires. Anyone who's actually done the soldering required for the cart slot ought to know if it would be difficult to separate chip 1 at the ground only (the first position on the rom) - in order to work in a switch... be it toggle or something automatic like 'gannon' was talking about.
Might as well throw a cart slot on as well... A lot of bulk though - if I can get get it as small as I want it I'll be happy with 12 games.

glassonion914 · Post by **glassonion914** » Sun Sep 18, 2005 4:43 am

are there multiple grounds on the rom chips?

daguuy · Post by **daguuy** » Sun Sep 18, 2005 7:56 am

there's a pinout for them in the downloads section. it looks like they have 2

glassonion914 · Post by **glassonion914** » Sun Sep 18, 2005 11:03 pm

you're right i see "gnd" at positions 13 and 32. can't remember where i read position 1 was ground, must be confusing it with something else. I wonder if it's necessary to interrupt them both...

Post by **gannon** » Mon Sep 19, 2005 5:16 am

it is, but they can be tied together.

Corscaria · Post by **Corscaria** » Sat Nov 12, 2005 9:25 am

?? umm.. wouldn't the proper way to be to tie your switch to the CE line... it is after all the Chip Enable Line

madc0w · Post by **madc0w** » Sat Nov 12, 2005 5:06 pm

SO OLD!! DONT BUMP TOPICS MORE THAN TWO WEEKS OLD!!!!

Xorealix · Post by **Xorealix** » Sat Nov 12, 2005 5:10 pm

The guy actually added relevant information to the topic, rather than just saying "Oh that's neat lol".

Leave him be.

soundwave · Post by **soundwave** » Sat Nov 12, 2005 6:27 pm

I wonder if that guys name is meant to be after the song by The Beatles...
(^Example of what not to say when bringing back a two months old thread)

Post by **gannon** » Sat Nov 12, 2005 6:35 pm

but by only switching the ce lines you might be increasing the total draw (probably by less than 10mA, but still

)

Post by **marshallh** » Sat Nov 12, 2005 7:46 pm

Corscaria are you on the camerahacking forums?