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Category: 1541 Ultimate
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zip.png 1541 Ultimate Firmware v1.5 NEW

1541 Ultimate Firmware v1.5:

- Show all entries in a D64 when loading directory through software IEC- Show all entries in a D64 when loading directory through software IEC

Known issues:

- CD:/ of the software IEC mode is broken- MOUNT: is partly broken (1541-bug-workaround was removed because we forgot why wedid that! Temporary solution: Issue initialize command to 1541 after mounting a D64: @8, @I)

Fixed from 1.5beta

- The menu waits until you release the keyboard before exiting.

12-08-19 English Commodore 64 958.71 KB 6.00
zip.png 1541 Ultimate Firmware v1.6 NEW

1541 Ultimate Firmware v1.6

- Reads from the Ethernet chip have been fixed. The unit now correctly receives packets.

12-08-19 English Commodore 64 934.9 KB 6.00
d64 floppy.jpg 1541 Ultimate Firmware v1.7 BETA

1541 Ultimate V1.7 beta Firmware Download

Installation instructions: 

1) Make sure that in your current configuration, the "application to boot" is set to "appl.bin" (the default).

2) Unzip the zip file into the ROOT of an SD-card, of which you have made sure that the 1541 Ultimate can read it.

3) Place the SD-card in the 1541U, and make sure the 1541U is correctly inserted in a C64/C128 expansion slot.

4) Turn on the C-64 and watch the screen output.

5) Turn off the C-64 when the update is finished.

In comparison to 1.6, the following has been changed:

  • The freezer has been made more robust. (Needs more testing)
  • Minor fixes in the IEC interface (but not yet satisfactory)
  • SID player has been added
  • Epyx Fastloader cartridge has been added
  • Support for custom carts has been added (8K/16K, as well as existing carts)
  • Support for (custom) Ocean and System3 cartridges added.

This is a BETA release.

04-11-16 English Commodore 64 689.23 KB 187.00
zip.png 1541 Ultimate Firmware v1.72b [unofficial] NEW

1541 Ultimate Firmware 1.72b [unofficial] with WVLs config save flash indication and P00 support, patched with the Ultimate-freezercode from 2.0 firmware (demos like Another Beginning and We Are New now works) and added the (Blu)REU-imagesupport. by Tommi Lempinen

12-08-19 English Commodore 64 112.07 KB 7.00
zip.png 1541 Ultimate Firmware v2.4a NEW

As far as I can tell, this is the latest and last firmware update for the original 1541 Ultimate as of August 2019.  This firmware was released in 2012.

03-08-19 English Commodore 64 182.48 KB 13.00
zip.png 1541 Ultimate Firmware v2.5 [unofficial] NEW

1541 Ultimate Firmware v2.5 [unofficial] with KCS power cartridge support, 1 drive and sound

12-08-19 English Commodore 64 190.12 KB 10.00
zip.png 1541 Ultimate Firmware v2.6d [unofficial] NEW

Released in November 2013, this firmware for the 1541 Ultimate I is the latest unofficial firmware available.  More information on this firmware by Obliterator918 can be found here.

03-08-19 English Commodore 64 200.03 KB 17.00
d64 floppy.jpg 1541 Ultimate User Guide 0.15 (c3) HOT

Found this older user guide for Gideon Zweijtzer's 1541 Ultimate.  Not sure if there is a newer one, but this one has a LOT of good info in it.  If you have on of these awesome cartridges for the Commodore 64, you'll want this guide.

07-10-15 English PDF 4.41 MB 564.00