SD2iec internal for Commodore 64

SD2IEC is an open source development created by Shadowolf and published at Forum64.de in 2008, which allows to emulate a Commodore 1541 disk drive by communicating through the Commodore IEC bus, present in several 8-bit models (VIC-20, 64, 128 and 264 series).

It uses SD cards as mass storage media and is based on the Atmega 644 or the larger Atmega 1284P microcontroller.

image SD2iec internal for the Commodore 64, an integrated all-in-one

Original Commodore 1541 disk drive

ATMEGA1284P-AU | AVR Microcontroller 8bit 16 kB RAM, 128 kB Flash, TQFP 44 pins 20MHZ

Atmega 1284p microcontroller

What are the possibilities of SD2IEC?

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SD2IEC is compatible with JiffyDOS, a C64/128 optimised disk operating system that allows higher speed and commands than the Commodore 64's factory DOS.

It allows the use of the most common fastloaders such as Speeddisk fastloader or GEOS Fastloader.
Supports reading and writing of .D64, .D71, .D81, .M2I, as well as .PRG and .P00 and partially .REL files.
Supports SD and SDHC cards with FAT12, FAT16 and FAT32 file systems
Compatible with multiple file managers: CBM FileBrowser, CBM-Command, Vic-20 Disk Menu, SD2IEC Dir Plus, ?

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CBM Filebrowser for C64/C128

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CBM Command for C64/C128

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SD2IEC DirPlus (264 Series)

It allows a device number to be permanently assigned in the SD2IEC EEPROM by two simple commands, allowing any other Commodore disk drive (1541,1541-II,1551, 1571) connected to the IEC bus to be used simultaneously with a different device number.

For example, to configure SD2IEC with unit number 9, currently configured for 8, we would type:

OPEN1,8,15,?U0>?+CHR$(9):CLOSE1 <- Assign device 9 to SD2IEC

OPEN1,8,15,?XW?:CLOSE1 <- Store the new value in the EEPROM of SD2IEC

SD2IEC models

Being an open source development, multiple versions of SD2IEC exist and have evolved over the years.

SD2iec External

Traditionally SD2IEC has been associated with external devices, which are connected via a 6-pin DIN cable and draw power from the user port or cassette port or an external power supply.

These devices, although versatile, require wiring when in use and in some cases prevent the use of other devices at the same time (datasette in cassette port or another device in user port) if the connector does not have a port expander, as well as adding a few more cables to the Commodore setup, in case there were not enough.

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TFW8d

sd2iec-amazon — SD2iec internal for Commodore 64, an integrated all-in-one 24

SD2iec for sale on amazon

sd2iec-jgilcas — SD2iec internal for Commodore 64, an integrated all-in-one 25

SD2iec external design by @jgilcas

From Hobbyretro.com we propose an internal SD2iec, specially adapted to the first generation Commodore 64 model (Panera or Breadbin) which includes: