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Specification 1541U-II PDF Print E-mail

1541 Ultimate-II


  • Full, cycle accurate emulation of two real Commodore 1541 diskdrives.
    • Uses .D64 and .G64 files stored on MicroSD card or USB stick
    • Supports .G64 files as well (Read/Write)
    • Configurable IDs
    • Configurable ROM (1541/1541C/1541II or custom)
    • RAMBOard memory expansion (up to 40K)
  • MicroSD or USB storage device (stick, card reader, and even HD)
  • FAT/FAT32 support, with sub-directories and long filenames
  • ISO9660 support with Joliet, for reading .ISO files and access external CD/DVD drives through USB
  • Supports SD V1.1 cards as well as SD V2.0 in High Capacity mode (SDHC)
  • Battery backed up Real Time Clock
  • Command Interface module with UltimateDOS
    • Accessible module through I/O space that allows direct commands to Ultimate-II
    • Ultimate-DOS, I/O space driven direct file access to SD/USB
  • Dual SID implementation, optionally 8 voices each
  • Ultimate Audio module
    • Up to 7 voices of sampled audio simultaneously
    • Accessible through I/O space
    • 8- or 16-bit samples
    • up to 48 kHz sample rate
  • Built-in SID player; plays SID files on either 'real' SID or emulated SID.
  • C64 cartridge emulation:
    • Final Cartridge III
    • Action Replay
    • Retro Replay
    • Super Snapshot
    • Turbo Assembler w/ Codenet
    • Epyx Fastloader
    • Custom 8K/16K carts
    • Custom Ocean / System3 carts (up to 512K)
  • Commodore 1750/1764 REU
    • REU Compatible
    • Size selectable from 128K up to 16 MB
    • Can be combined with Retro Replay and SuperSnapshot compatible roms
  • Flexible freezer menu
    • select, mount, create D64 images, browse disk images
    • create new directories, delete files
    • Ultra fast DMA load of single file programs (.PRG files on SD/USB, inside .D64 or .T64)
  • Configuration screen, with resident settings
  • Tape emulation, through 6-pin header on the bottom of the board*
    • Load .TAP files to C64
    • Capture tape data from C64 to .TAP file
    • Capture tape data from a datasette and store it as .TAP file
    • Write .TAP files back to tape, using a Commodore tape deck
  • Totally rewritten firmware, for easier expansion and maintenance


* Tape emulator cable is an accessory, which is needed to work with tap files.



- Board size: 62 x  84 mm

- Sturdy plastic case, enforced with glass fiber

- 700k-gate FPGA

- Full size 6-pin DIN connector (IEC)

- 2 MB Flash ROM


- MicroSD card compatible slot

- USB host port (supports Mass storage class only)

- Stereo audio output

- 6-pin expansion pin-header for connection to tape port (for C2N emulation), or other future features.


Last Updated ( Monday, 17 March 2014 19:44 )
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Design by go-vista.de and augs-burg.de