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- The 1541 "Ultimate"
-
- (On this moment on a Xilinx developing
- board) The construction and future of the 1541 "Ultimate" At this time, some
- hard work is performed to replace the
- widespread 1541 disk drive.
-
- Our club member Gideon Zweijtzer has
- made an implementation of the 1541 disk
- drive in an FPGA, and demonstrated one
- of the first versions of this hardware
- emulation on Saturday December 16,
- 2006 in Maarsen. This prototype used
- a Xilinx development board. The
- prototype shows that it is possible to
- ?download? an image of a floppy disk
- from the PC to the 1541-emulator by
- means of Ethernet. This image is
- placed in a memory that the 1541-
- emulator has access to. The rotation of
- the disk and the stepper motor that
- moves the read/write head is mimicked
- accurately. The achieved compatibility
- is very high, because this
- implementation uses the original 1541
- ROMs. At this moment the emulator is
- perfection to the point that even
- difficult speed-loaders such as the one
- from the Final Cartridge III work well.
-
- Parallel to the implementation of the
- 1541 itself, work is being done on an
- interface to a SD-card, such that it
- should be possible to load .D64-files
- from there, rather than having to
- download them through Ethernet.
- These two functions together will
- appear soon on just one printed
- circuit-board; one that can be used as
- cartridge for the C-64. This cartridge
- will include the 1541-emulator, but
- will also implement another cartridge,
- such as the Final Cartridge III. With
- this cartridge it will be possible to
- select a floppy image and ?put it in
- the drive?, by means of a menu on the
- C-64 screen. For the purpose, the
- cartridge has a ?third button?. This
- button functions very similar to the
- freeze-function of other cartridges,
- but will be used to bring up a menu to
- select an image from the SD-card. When
- the user exists the menu, the Commodore
- will continue operation. To serve other
- Commodore users as well, other than
- C-64 users, the plan exists to have
- this cartridge operate as stand-alone
- unit as well. Since the on-screen menu
- will not be available in this case, the
- user needs another method to select the
- floppy image. There are several ideas
- to do this, but these ideas are not yet
- completely mature. The hardware is
- being developed such that new
- functionality can be added to the
- emulator system by simply putting
- some files on the SD-card. The first
- release will ?only? implement the
- cartridge and the 1541 in its purest
- form.
-
- Information used with permission and
- taken from
- http://commodore-
- gg.hobby.nl/innovatie_1541kaart_eng.
- htm
-
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-