Interfacing an Atom to a Raspberry Pi Pico

emulators, hardware and classic software for atom + system machines
Prime
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Re: Interfacing an Atom to a Raspberry Pi Pico

Post by Prime »

Am I correct in assuming that Lower case on the Atom should replace the black text on green characters with the lower case green text on black?

Might need to do some twiddling as the Dragon would want to replace the green on black with the lower case black on green.....

Basically what the two machines considder "inverse" is inverted :)

Cheers.

Phill.
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cjm
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Re: Interfacing an Atom to a Raspberry Pi Pico

Post by cjm »

Prime wrote:
Fri Jun 04, 2021 4:44 pm
Am I correct in assuming that Lower case on the Atom should replace the black text on green characters with the lower case green text on black?
As far as I know the Atom never had lower case. But lower case green text on black was a deliberate choice - maybe the GODIL version does something different?
Prime wrote:
Fri Jun 04, 2021 4:44 pm
Basically what the two machines consider "inverse" is inverted :)
So normal on a dragon is black text on green?! :shock:

Chris
Atom + YARRB + Noise Killer + HDMI adapter + Homebrew RPi-MMC AtoMMC V4
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roland
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Re: Interfacing an Atom to a Raspberry Pi Pico

Post by roland »

Upper case on the Atom is green (or white, depending on your monitor) on a black background. Lower case is black on a green (white) background.
Screenshot 2021-06-09 at 23-11-31 Acorn Atom Emulator.png
The Godil can use different character sets, some of them have real lower case characters.
FPGAtom: 512 KB RAM, Real Time Clock and 64 colours
MAN WOMAN :shock:
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cjm
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Re: Interfacing an Atom to a Raspberry Pi Pico

Post by cjm »

An interesting project idea would be to redesign the pico vga board using an RP2040 in place of the pico. It is a bit easier now that JLCPCB stock the chip.
jlcpcb.PNG
https://twitter.com/JLCPCB/status/1408343801865728002
Atom + YARRB + Noise Killer + HDMI adapter + Homebrew RPi-MMC AtoMMC V4
Prime
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Re: Interfacing an Atom to a Raspberry Pi Pico

Post by Prime »

cjm wrote:
Fri Jun 25, 2021 7:57 pm
An interesting project idea would be to redesign the pico vga board using an RP2040 in place of the pico. It is a bit easier now that JLCPCB stock the chip.

jlcpcb.PNG

https://twitter.com/JLCPCB/status/1408343801865728002
Possibly, but at the numbers we'd be talking about for Atom (or even Dragon/CoCo) adapters could it be done for less than the price of a Pico, remembering that it already contains the external flash, vreg, crystal etc. Also the RP2040 isn't a perticually hand solder friendly part :) TQFP would have been better but there's still the big GND pin on the bottom :) Mind I guess if you put a big diameter VIA there you could solder it from the other side....

Cheers.

Phill.
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