Rev A September 2022
This version was built and minimal tests were performed. The footprint for the DIN connectors is wrong. Don't put in the DIN connectors. The alternate footprints are fine, I used a cable with a JST connector on one side and a male DIN on the other.
Rev B will have a corrected footprint and maybe more IO connectors (serial, LCD connectors were left out due to routing headache)
You can quote me on this:
Triple check your footprints with the real things. Don't blindly trust a footprint diagram found on AliExpress - me
Yet another varion of the SD2IEC hardware device. From the wiki:
The SD2IEC is a mass storage device using an SD/MMC card and interfacing with the IEC bus. It is based on the ATmega644 microcontroller from the Atmel AVR microcontroller family. The most prominent use of SD2IEC is replacement of a Commodore-1541 disk drive for a C64. The hardware and the microcontroller sd2iec firmware are available as open source
Compatible with C64, C64DTV, C128 (no burst mode), C16, VIC-20, etc.
- Nothing fancy, there are 1001 version out there, it's just mine
- ATmega1284p
- more headspace
- Reset button
- only resets the drive, not the whole computer nor the other drives
- Full size SD slot
- ...which happens to be one I had on hand, so triple check the layout (holes and pads on the side) to see if it will fit with yours
- Prev / Next buttons
- Not even sure what they do, need to check the doc
- Device selection DIP switches (8-11)
- Red / Green LEDs for activity, red flash on error, etc.
- Voltage regulator
- MIC5504-3.3YM5 LDO regulator
- can probably be swapped with another regulator with same footprint
- don't put in more than ~6V (5.5 regulator max + diode drop)
- ...or less than 4V
- Powers from the 5V on the datasette connector (optional).
- Can solder alternate 5V power source on pads 1 & 2
- I'll put in an alternate pin header in RevB...
- MIC5504-3.3YM5 LDO regulator
- Two DIN connectors with passthrough, so you can daisy chain with another drive or more.
- The footprint for the DIN connector is wrong in RevA, don't use it
- Alternate footprint for the two IEC connectors: Can solder in 2.54mm pin headers instead of the DIN connectors
- I put a JST connector in there
- Again, don't use the DIN connectors with RevA!
- The IEC lines are switched with MOSFETS (AO3400A)
- ...which are not recommended for new designs and surely out of stock everytwhere (everything is at the moment). There are probably direct replacements
- Fancy tantalum capacitors which are surely overkill. Not sure what I was thinking. Don't put 'em backwards
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