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SD2IEC

Rev A September 2022

Basic Tests: works, with flaws

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

Description

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.

Features of this version:

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...

Comments

SD2IEC

Rev A September 2022

Basic Tests: works, with flaws

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

Description

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.

Features of this version:

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...

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SD2IEC

Basic Tests: works, with flaws

Description

Features of this version:

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SD2IEC

Basic Tests: works, with flaws

Description

Features of this version:

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Schematics (pdf)

PCB Images (svg)