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Using JiffyDOS

The advantage of JiffyDOS is that you can load files from the simulated 1541 disk drive (*.d64 files) significantly faster. It also works with real hardware disk drives that you attach via the MEGA65's IEC port as long as you have installed the JiffyDOS ROM on those drives, too.

Learn more about JiffyDOS in the C64 Wiki. You will also find download links to the user's manual there.

Where and how to buy

JiffyDOS is commercial software. Here is a list of authorized Sales Channels:

https://www.go4retro.com/products/jiffydos/

Here is what you need to buy:

  1. JiffyDOS 64 KERNAL ROM Overlay Image
  2. JiffyDOS 1541 DOS ROM Overlay Image

Some shops offer variants such as C64C or 1541-II. Don't buy those.

The download packages are ZIP files. Unpack them. For performing the next steps, you only need the *.bin files.

Prepare the files

The C64 for MEGA65 core needs two files, each of them needs to be exactly 16 kB = 16,384 bytes in size.

C64 Kernal ROM: jd-c64.bin

  1. Download the C64 BASIC ROM basic.901226-01.bin from zimmers.net
  2. Concatenate the C64 BASIC ROM with JiffyDOS: First the BASIC and then JiffyDOS
  3. Make sure that the resulting file is called jd-c64.bin

Example for the macOS and Linux terminal

The following commands assume that you are in a folder that is empty with the exception of one file that is called JiffyDOS_C64_6.01.bin.

wget http://www.zimmers.net/anonftp/pub/cbm/firmware/computers/c64/basic.901226-01.bin
cat basic.901226-01.bin JiffyDOS_C64_6.01.bin > jd-c64.bin

Example for the Windows command prompt

The following command assumes that you are in a folder that contains the following two files: JiffyDOS_C64_6.01.bin and basic.901226-01.bin.

copy /b basic.901226-01.bin+JiffyDOS_C64_6.01.bin jd-c64.bin

Hint: Do not omit the /b (for binary) in the copy command above.

C1541 DOS ROM: jd-c1541.bin

The JiffyDOS download package contains two *.bin files. Take the one that is exactly 16 kB = 16,384 bytes in size and rename it to jd-c1541.bin.

Install and use JiffyDOS

  • Make sure the core is not started (for example: switch off the MEGA65)

  • Make sure you have a /c64 folder on the SD card that is active, when the C64 for MEGA65 core boots. Remember, that the SD card slot on the back of the MEGA65 takes precedence over the SD card slot at the bottom.

  • Copy jd-c64.bin and jd-c1541.bin to the /c64 folder of your SD card.

  • Start the core with the updated SD card

  • Select "JiffyDOS" in the "Kernal" submenu of the core's menu