What a day!

In case tomorrow I get hit by a bus I have already published everything on GitHub. It was quite difficult to find both C128 and 1571 DolphinDOS firmware parts. Now there is one more place that preserves them together.

The README file will be gradually updated with proper links and pictures.

https://github.com/ytmytm/c128dcr-DolphinDOS3

#commodore128 #c128 #dolphindos #kicad

Just how fast is it?

31 times as fast as stock 1541. Faster than DD3 on 1541 (23x).

Here are the full benchmark results from both 1571 mode (U0>M1) and 1541 mode (U0>M0) using 64'er benchmark program from https://www.c64-wiki.com/wiki/Comparison_of_fast_loaders

#commodore128 #c128 #dolphindos

Great success - it works! The biggest surprise is that the file name of the only DolphinDOS 3 1571 drive ROM I found suggested it's for a standalone 1571. However after testing in VICE it worked in C128DCR. This finally confirms that indeed that ROM is good for 1571CR.
That is a bit strange because both original Commodore DOS ROMs as well as JiffyDOS images have different versions for standalone 1571 and 1571 from C128DCR.

#commodore128 #c128 #dolphindos

Parallel cable was the next step. The IDC connector end doesn't have strain relief because then I wouldn't be able to push it through user port opening while the mainboard is in.
The connector is easy to make, but with symmetrical plugs I'm never sure what am I looking at on the drawing. Photo for reference (also for me). Side with one wire is up, side with 9 wires with red on the left is bottom.

#commodore128 #c128 #dolphindos