This universal circuit board uses the Commodore CBM serial bus protocol to emulate a Commodore 1541 drive and a 1530 (C2N) cassette drive.
Note: There is no "IEC" bus, nor an IEC C64 floppy drive. IEC stands for "International Electrotechnical Commission" and, in relation to the Commodore 64, is a fabricated misnomer used by some hobbyist projects dealing with the 1541 drive. This can also be verified on Wikipedia. Therefore, the correct term is Commodore Serial Bus, or briefly: CBM-S.
Using this board, a small universal 1541 drive including a TAPE drive can be easily and inexpensively connected to the Commodore 64. It can be operated directly at the TAPE port or as a standalone device with external power supply. It is also prepared for direct use on the uEliteBoard64, with the board plugged directly into the uEliteBoard64.
The firmware also includes a small file browser that can be loaded with LOAD"<-",8. Through this file browser, PRG, P00, T64, D64, and TAP files can be launched. It is also possible to delete files and create a D64 disk via the browser. Games that load multiple D64 files from a single D64 disk directory also function correctly.
The integrated 128x64 pixel OLED display shows the loading progress.
Additionally, even in the smallest version using the ATMega328P, EPYX Fastload support is already included, enabling very fast file loading (~200 blocks in 8 seconds).
The board offers three possible upgrade stages:
- ATMega328P
- ATMega644
- RP2040 Zero
Depending on which processor is used, additional functions become available.
Availability Note: "To ensure the high quality of this Public Domain project, the source code and hardware designs are currently being prepared and finalized for release. Full access to the data will be made available to the public (and thus to all customers) free of charge in the course of 2026 (as usual on the wiki page). The hardware itself is, of course, already fully functional and ready for use."
Manufacturer and Safety Information
Manufacturer InformationDipl. Inf.(FH) Matthias Lorenz
c/o Online-Impressum.de
Europaring 90
53757 Sankt Augustin
www.uni64.com
E-Mail: webshop@uni64.com
WEEE-Number: DE94821459
Responsible Person for the EU
See manufacturer information
Product type: Unpopulated printed circuit board (PCB) for further processing.
Product IdentificationProduct: CBM-S 1541 + TAPE 2 SDCard
Art.-No.: 7555
This product must not be disposed of with household waste. Please hand it in at a municipal collection point.
Safety Instructions:- This product is not suitable for children.
- PCBs may have sharp edges or corners due to manufacturing. Handle with care.
- Designed exclusively for use in low voltage electronic circuits (max. 12V DC). Further processing (assembly/soldering) must only be carried out by qualified personnel.
In Stock (delivery in 3-5 days *)