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Matej

A800 Raspberry PICO?

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Yes, just like the Zero. Install Raspbian. apt-get install atari800, and you're good to go! Or install RetroPie.

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On 2/18/2021 at 12:24 PM, ivop said:

Yes, just like the Zero. Install Raspbian. apt-get install atari800, and you're good to go! Or install RetroPie.

The Pico is a microcontroller, there is no Raspbian or apt-get. 😎

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2 hours ago, gozar said:

The Pico is a microcontroller, there is no Raspbian or apt-get. 😎

Yeah, sorry. I thought the Pico was a smaller Zero for a while, but I see it's a different beast.

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12 hours ago, Wrathchild said:

The UNO Cart can do such things

The demos on your YouTube channel using the UnoCart as an accelerator of sorts is amazing. It buy another UnoCart to use for that purpose...if I knew how to utilize it :) 

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I mod'd by board to use pins rather than the receptacles that it normally came with, but so long as you can knock up a cable to attach to them, re-programming via an ST-LINK USB dongle or a cheap dev-kit board, e.g. NUCLEO-F411RE 

 

image.thumb.png.e6e32222828132c20601c3d70ffacd71.png Bottom/Back of PCB when inserted in Atari

 

I have seen there is also this on Ebay from Slovakia so wonder if the power and 2 lines on this is enough for an external programmer, is the manufacturer on Atariage (seller=laco0042)?

So in the same way people have added an adapter to the AVG Cart board for the SIO, the same could be done here for a re-programming cable.

 

image.png.53c6e692ece83e40abb77c9b9a8501bd.png

 

(I like too that its a full SD, not micro)

 

 

Regarding the Pico, it runs as 133MHz which is not enough for the bus-sniffing (stm32f407 runs at 168MHz and over-clockable higher than that)

Edited by Wrathchild
added example dev-board
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2 hours ago, Wrathchild said:

Regarding the Pico, it runs as 133MHz which is not enough for the bus-sniffing (stm32f407 runs at 168MHz and over-clockable higher than that)

I'm pretty sure the document I read said the Pico can be over clocked too, not sure to what, but I'm sure someone will do it and let us know.

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6 hours ago, Wrathchild said:

Regarding the Pico, it runs as 133MHz which is not enough for the bus-sniffing (stm32f407 runs at 168MHz and over-clockable higher than that)

Instead of bus-sniffing in software you should be able to offload that to the programmable I/O (PIO) state machines - a really nice feature!

 

so long,

 

Hias

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Does look nice, getting my brain to think that way is akin to the effects of drinking a Pan Galactic Gargle Blaster though :D

 

Also a side effect utilised by the bus-sniffing is that it doesn't respond when the ARM is busy off doing other things and so generally the bus reads high as the A8 needs its answer the cycle's window.

So having a FIFO approach could confuse things. But if someone can pull that off then we could have a cheap solution.

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...evidently the PICO has lots of overclocking headroom. The guys at the Raspberry Pi forums are saying it will hit 436Mhz 😳 

 

Thank you for the info on how to prepare the UnoCart board for low cost programming :) 

 

The biggest issue for me is that I have no clue how to interact with the accelerator version of the UnoCart. I understand where in memory regular carts are mapped, TRIG3, etc., but I wouldn’t what to do from there. 

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What's the thinking on using the round hole connectors? All my connector cables are the square (DuPont (?)) type, and I either have to unsolder the shipped connectors and put pins in like @Wrathchildhas, solder together some sort of round pin to square pin bridge, or track down some cables that have round pins at one end that I can use with an ST-link USB dongle? Am I missing an easy way to do this?

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I've put together code for a NES emulator for Raspberry Pi Pico as well.
In my project it can run several ROMs using Mappers 0, 1, 2, 3, 4 and 7 (90% of the games).

It can do 60 frames per second on VGA and emulates APU and PPP perfectly well.
It uses a PS/2 Keyboard as controller (I have no NES controller here with me).
Sound is very impressive and there no glitches on video and backgound game music.


Is it of interest of this community to have an Atari 800/5200 emulated on this board as well?
I'm pretty sure I could get it done in a couple of months or so..

It's very impressive for such a small ARM Cortex M0+ microcontroller.
Video of Castlevania demonstration can be foud at

 

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