This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
LOAD (SAVE, RENAME, etc.) work very much as in DOS 3.3.; so, you can use
Slot and Drive parms to specify the target volume. However, to get the most
from ProDOS you will usually be working with volume names and folders. (or,
"directories").
If GAME3.PIC is a binary file in a directory named "PICS" on a volume
named "NARF", you could load it into memory starting at address $2000 via
BLOAD /NARF/PICS/GAME3.PIC,A$2000
or, in BASIC
100 PRINT CHR$(4)"BLOAD /NARF/PICS/GAME3.PIC,A$2000"
So, in ProDOS, you can access a disk (or volume) by name ...
RUN /GAMES/CHINA.SEA
will find the disk (volume) named "GAMES", then, find, load, and run CHINA.SEA.
You can, also, refer to a disk by its location ...
CAT,S6,D1
will do a short-form catalog of the main directory of the diskette in DRIVE 1
connected to SLOT 6.
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