Category: 1541 Ultimate II |
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1541 Ultimate II Audio API Manual | |
The ‘Ultimate Audio’ feature is a new feature for the 1541 Ultimate-II module. It implements multichannel audio sample playback support from REU memory, and is an exciting addition to the possibilities this cartridge offers. |
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2016-01-13 English PDF 567.02 KB 709 | Download |
1541 Ultimate II Firmware 2.5a | |
1541 Ultimate II Firmware 2.5a |
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2016-01-15 English Commodore 64 799.77 KB 740 | Download |
1541 Ultimate II Firmware v2.4a | |
1541 Ultimate II Firmware v2.4a |
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2016-01-20 English Commodore 64 794.8 KB 708 | Download |
1541 Ultimate II Firmware v2.4c | |
1541 Ultimate II Firmware v2.4c |
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2016-01-15 English Commodore 64 695.22 KB 681 | Download |
1541 Ultimate II Firmware v2.5 | |
Version 2.5 includes some new features:
This version also includes some fixes for nasty memory allocation bugs that existed when using USB sticks. Removal of a USB device is now at least a lot safer. Also, some file system bugs were fixed. |
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2016-01-13 English Windows 702.13 KB 669 | Download |
1541 Ultimate II Firmware v2.5+ | |
Version 2.5+ includes some new features: The ‘plus’ version of 2.5 including a special 7-voice audio engine. This version is based on the same 2.5 with the bugfixes and a special FPGA build can it only supports ONE floppy drive, in favor of extra audio functionality. |
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2016-01-13 English Windows 694.53 KB 661 | Download |
1541 Ultimate II Firmware v2.5x | |
1541 Ultimate II-Firmware v2.5x |
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2016-01-15 English Commodore 64 696.44 KB 715 | Download |
1541 Ultimate II Firmware v2.6 | |
Version 2.6 includes some new features:
... and some important fixes, including:
Release notes:
Installation instructions:
Command Interface and Ultimate-II DOS See the documentation of the Command Interface module for knowing how to use it! See the documentation of the Ultimate-II DOS, to get to know what you can do with the Command Interface in this firmware release. |
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2016-11-04 English Commodore 64 709.29 KB 774 | Download |
1541 Ultimate II Firmware v2.6d | |
Release notes 2.6d:
See for additional information the download item of V2.6 |
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2016-11-04 English Commodore 64 711.14 KB 769 | Download |
1541 Ultimate II Firmware v2.6e Dual Drive [unofficial] | |
1541 Ultimate II Firmware v2.6e Dual Drive [unofficial] |
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2016-01-15 742 KB 662 | Download |
1541 Ultimate II Firmware v2.6g | |
1541 Ultimate II Firmware v2.6g |
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2016-01-15 English Commodore 64 689.11 KB 690 | Download |
1541 Ultimate II Firmware v2.6g w/1 drive and SID [unofficial] | |
1541 Ultimate II Firmware v2.6g w/1 drive and SID [unofficial] |
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2016-01-15 English Commodore 64 716.29 KB 654 | Download |
1541 Ultimate II Firmware v2.6h | |
Version 2.6h contains some small fixes on top of 2.6d. This build is a DUAL DRIVE version with NO SID emulation.
See for additional information the download item of V2.6d. |
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2016-11-04 English Commodore 64 729.91 KB 729 | Download |
1541 Ultimate II Firmware v2.6k w/audio | |
1541 Ultimate II Firmware v2.6k w/audio |
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2016-01-15 English Commodore 64 716.44 KB 710 | Download |
1541 Ultimate II Firmware v2.6k w/dual drive | |
1541 Ultimate II Firmware v2.6k w/dual drive |
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2016-01-15 English Commodore 64 708.87 KB 688 | Download |
1541 Ultimate II Firmware v3.0 Beta 4 | |
1541 Ultimate II Firmware v3.0 Beta 4 |
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2016-01-15 English Commodore 64 2.23 MB 693 | Download |
1541 Ultimate II Firmware v3.0 Beta 5 | |
A new version of the firmware for the interface 1541 Ultimate II is released. This version runs only on the 1541 Ultimate II cartridge (new fpga). Release notes 3.0 beta 5: Major:
Minor:
Release notes 3.0 beta 4 (first version released on Facebook):
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2016-01-11 English Windows 2.28 MB 842 | Download |
1541 Ultimate II Firmware v3.0 Beta 7 | |
3.0 BETA 7 Prepared for release 3.0b7 Some fixes: ------------------------------------------------------------------------ Fix wrong DDRA readback (typo) |
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2016-06-22 English Commodore 64 2.28 MB 750 | Download |
1541 Ultimate II Firmware v3.2 | |
** Contains firmware for both 1541 Ultimate II and 1541 Ultimate II+ Release notes 3.2 3.2
Installation instructions:
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2018-08-24 English Commodore 64 2.66 MB 839 | Download |
1541 Ultimate II Firmware v3.4c | |
1541 Ultimate II Firmware v3.4c Release Notes
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2019-09-01 English Commodore 64 1.79 MB 538 | Download |
1541 Ultimate II Firmware v3.6 | |
General Usability and Compatibility:
Improvements to the 6502 CPU for improved 1541 compatibility:
Various other bug fixes:
Dropped features:
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2019-10-20 English Commodore 64 1.81 MB 563 | Download |
1541 Ultimate II Firmware v3.7 | |
Added features since 1.24
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Website 2020-05-14 English Commodore 64 1.79 MB 540 | Download |
1541 Ultimate II Quick Guide (Firmware 2.6k) | |
This is the quick install / user guide for the 1541 Ultimate II running firmware 2.6k. |
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2015-05-26 English PDF 304.71 KB 736 | Download |
D71 - D81 Writer v1.1 | |
A Dutch user by the name of Wiebow (aka WdW) has made a small ultility to write D71 (1571 diskdrive) and D81 (1581 diskdrive) from image file back to the real drive. It uses the 1541 Ultimate II(+) api to do so. The 1541 Ultimate II (+) does not allow you to mount a D71/D81 image, but at least you can write it back to real disk and run it on your C64 and 1571/1581 hardware. |
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2018-08-30 English Commodore 64 28.71 KB 822 | Download |
Ultimate Audio MOD Player | |
Freshness released a new program for the 1541 Ultimate. The program can be used for playing audio MOD files with your 1541 Ultimate. The MOD file system was developed by Karsten Obarski in 1987 for tracker software on the Amiga computer. |
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2016-01-13 English Commodore 64 93.94 KB 708 | Download |
Ultimate II Command Interface Reference v1.0 | |
Command Interface Reference v1.0 (2013) by Gideon Zweijtzer - Although the title suggests this is only for the Ultimate II, this document is also valid for the Ultimate II+ and Ultimate 64. Here is the overview as quoted from the document: The ‘Ultimate-II command interface’feature is a new feature for the 1541 Ultimate-II module. It implements a way to communicate to the 1541 Ultimate-II programmatically from the Commodore 64, through the cartridge port I/O registers. The‘Ultimate-II command interface’is the communication layer between the C64 on one side and functional modules of the 1541 Ultimate-II on the other side. Such a functional module takes a command, and returns data and status back to the user program on the C64. This document was obtained from the 1541 Ultimate official Github repository and should not be considered the most current version. Please visit the Github project for updates and other related documentation. |
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2023-01-19 English PDF 738.02 KB 154 | Download |