Subj : Re: Making a .d71 out of two .d64 images
To   : Tristan Miller
From : Andreas Kohlbach
Date : Fri Jan 31 2020 14:06:48

On Fri, 31 Jan 2020 12:41:00 +0100, Tristan Miller wrote:
>
> I'd like to play Ultima V in VICE.  This game came on four double-sided
> disks, which entailed a lot of disk-swapping.  But if memory serves, the
> C128 version of the game supported up to two drives, and if the drives
> were 1571s, the game would automatically read the correct side of the
> disk for you.  So with two 1571s, instead of one 1541, you could cut the
> number of disk swaps by factor of 4.
>
> The problem is that the only disk images of the game I have are .d64
> images of the eight individual sides.  Is there any way of combining two
> .d64 images into a single .d71 image?  Or is my only option to buy a
> floppy drive capable of reading double-sided disks and the requisite
> imaging software, and then manually re-image all the physical disks?

The 8bitguy on YouTube just released a video about Commodore disk
drives. The 1571 head two heads, thus could read both sides of a floppy
without turning it around, if made for the C128.

It also could read C64 (.d64) disks. But in the 1541 you would turn
around a disk to read the other side. That means that a 1571 could not
read the second side as the rotation of the disk would be the wrong way
(you would not turn the disk around as on a 1541). Thus I don't think
it's possible to run a double-sided 1541 disk on the C128 using a 1571
drive.
--
Andreas

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