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.
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:
- JiffyDOS 64 KERNAL ROM Overlay Image
- 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.
The C64 for MEGA65 core needs two files, each of them needs to be exactly
16 kB = 16,384 bytes
in size.
- Download the C64 BASIC ROM
basic.901226-01.bin
from zimmers.net - Concatenate the C64 BASIC ROM with JiffyDOS: First the BASIC and then JiffyDOS
- Make sure that the resulting file is called
jd-c64.bin
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
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.
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
.
-
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
andjd-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