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Intellivision RTO-MultiCart - new multicart


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An importart note for who wants made the RTOCart himself: in the previous kicad project published in GITHUB were listed by mistake 74LS245 ICs instead the right ones 74LVC245: be sure to use the right level shifter!!!

Thanks to Alberto who pointed me on the error! ;)

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  • 2 weeks later...

Some users found a bug in RTO-Cart i didn't found because i use composite or HDMI output:

pin 8 in the cart's slot (video-ext input) has to be connected to GND, or you'll have a very disturbed video in RF TV output!

This is the simple patch:

rf-out_mod.thumb.jpg.96717b5df6fcd5aecd5f487f73122a50.jpg

 

I'm working at a new versione of the cart with Reset handling and a "back" buttons, i'll update the github with all the fix and new feature as soon as i'll finish it.

 

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6 hours ago, Caleb Garner said:

Is this something someone is making for sale or something people are just making for themselves?  I'm certainly glad to see new multicart options surface.  

I'm working on making these available. Hopefully an update in a couple of weeks or so, as boards and parts arrive.

 

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On 1/22/2023 at 12:58 PM, aotta said:

I'm working at a new versione of the cart with Reset handling and a "back" buttons, i'll update the github with all the fix and new feature as soon as i'll finish it.

I see you're adding another chip. I guess I was a bit early in ordering a prototype. Oh well, I guess I can wire it up manually, at least to test the new features... .

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Yes, i can't reset the console fine, so I'll test grounding reset line while checking /msync signals. With a fourth 74lvc i could use one in input and the other in output in the same time.

I'm waiting for the pcb for test and coding so it's probably a bit early for ordering the prototype.

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5 hours ago, aotta said:

Yes, i can't reset the console fine, so I'll test grounding reset line while checking /msync signals. With a fourth 74lvc i could use one in input and the other in output in the same time.

I'm waiting for the pcb for test and coding so it's probably a bit early for ordering the prototype.

Sounds good. With my v1.0 board, with 3rd switch, I'll be able to do all the sizing and fitting, and test most of the functions. Then I'll wire in the reset/msync and 4th chip, to test v1.1 and beyond, until ready.

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16 hours ago, aotta said:

Yes, i can't reset the console fine, so I'll test grounding reset line while checking /msync signals. With a fourth 74lvc i could use one in input and the other in output in the same time.

I'm waiting for the pcb for test and coding so it's probably a bit early for ordering the prototype.

I had another board I needed to order anyway, so now I've got some v1.1 boards ordered at the same time as the v1.0 ... I was able to combine shipping with the previous order, so at least I don't have to pay that twice.

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