https://github.com/jbilander/sdbox-v2

SDBox-v2 for Amiga, compatible with the new updated card-detect firmware
https://github.com/jbilander/sdbox-v2

Last synced: 5 months ago
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SDBox-v2 for Amiga, compatible with the new updated card-detect firmware

Host: GitHub
URL: https://github.com/jbilander/sdbox-v2
Owner: jbilander
License: gpl-3.0
Created: 2021-08-01T16:12:13.000Z (almost 5 years ago)
Default Branch: main
Last Pushed: 2021-10-11T09:03:42.000Z (over 4 years ago)
Last Synced: 2025-10-07T02:51:02.866Z (9 months ago)
Homepage:
Size: 23 MB
Stars: 47
Watchers: 3
Forks: 2
Open Issues: 11
Metadata Files:
- Readme: README.md
- License: LICENSE

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README

# SDBox v2
***
SDBox v2 for Amiga, hardware compatible with the new updated card-detect (insert/eject interrupt) firmware written by N.Ekström available here: https://github.com/niklasekstrom/amiga-par-to-spi-adapter
***

***

Here is a short video clip showing the new card detect feature:

https://drive.google.com/file/d/11R0idJcfvWwsGSfzbPFG1xpoupvCA6SC/view?usp=sharing

***

### Howto build the SDBox Rev2...

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Start by soldering the `U2` and `U3` ICs, then the passives, the card holder, micro-usb jack, DB25M and so on, nothing complicated, but do skip the 6-pin ICSP-header on the Nano if you're going to put this in a 3D-printed case...

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At this stage, before you solder the Nano down to the board, you should verify that `+5V` via the Micro-USB jack is ok...

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Now the Nano, validate `+5V` and `+3.3V` is ok on the Nano:

Powering the MicroSD card directly from the 3.3V-pin of the Arduino, are you nuts?

Well, maybe, but typical SD card current consumption is `~30mA` in SPI mode.
The Arduino Nano taps `3.3V` from the internal LDO `3V3OUT` supply of the `FT232RL` USB-chip, or in case of the clones the `CH340` USB-chip.

FT232RL: Up to 50mA can be drawn from this pin to power external logic if required.
CH340G: Maximum output current is 30mA, and that voltage stays rather stable up to about 30mA.
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Time to build and flash the firmware:

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And we need to 3D-print a case for it before we put the LEDs in, don't we?...

(STL-files available in the DSM folder)

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Final result:

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Comparison with `v1`, look at the difference in size:

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Now time to build the new `spisd.device` driver, add `+kick13` to the `build.bat` if default is set to build for AmigaOS 2.0...

(`VBCC` for Windows I downloaded from here (Thanks: Leffmann for the installer), https://eab.abime.net/showthread.php?t=83113 )

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### Howto get 5V from the Amigas external floppy port _(250 mA max)_, let's make a cable...

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I did't have a `DB23` Male connector so I used a `DB25` and cut it down to a 23 with a hacksaw. I cut on the left side (pin 1 and 14) so that the plug will clear the neighbouring RCA-jack when plugged into the A500 external floppy drive port.
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Remove pin 1 and 14, wiggle back and forth with a plier until they exhaust and snap then pull out the remains from the other side
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Cut and wirestrip the micro-usb cable. Verify polarity, normally black is GND and red is +5V but the cable mfg might have mixed up the wire colours so check with a multimeter to be certain. Pin 3-7 on the connector is GND on the Amiga, +5V is on pin 12. You could either Blob pin 3-7 together (requires quite a lot of solder) and then solder the micro-usb GND-wire to that Blob or do as I did below with 5 individual wires soldered and crimped together.
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Some shrink tube on, a bit overkill maybe but hey it's a guide, no shortcuts, I even crimped AND soldered the GND-joint :)
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Ready to go and it clears both the RCA-plug and the serial port connector. With this cable now plugged into the SDBox it'll be powered on as soon as the Amiga is powered on and vice versa.
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***

Happy Hackin'

ecosyste.ms

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https://github.com/jbilander/sdbox-v2

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README