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Switching flashdrive
To switch to using a flashdrive, you can use the following command:
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%DRIVES
This will unmap all existing flashdrives and re-detect your flashdrive, automatically mapping any drives back
again as it would do on boot. Your BASIC program and all other data will be unaffected by this process, so it's a
very useful command for transferring files from one flashdrive to another.
Note that once your flashdrive is initialised, ResiDOS stores its details (about cylinders, heads, sectors etc) on the
flashdrive itself, so when swapping flashdrive there is no need to set these details again.
Entering ResiDOS Commands
ResiDOS commands are easy to enter under any version of BASIC, from the standard keyword-driven 48K
BASIC to the more recent versions such as SE BASIC and Gosh Wonderful, which allow commands to be
entered letter-by-letter.
For all commands, the % characters shown on this website are completely optional. They're only required if the
command would otherwise be accepted by BASIC (eg, in most BASICs, LOAD "name" would load a program
from tape, so you need to use LOAD %"name" to load a program from flashdrive). For BASICs which use
keyword entry (eg standard 48K BASIC), it's also usually convenient to start commands which don't have a
keyword with %, simply to take the Spectrum out of K mode and into L mode. On single-character-entry
BASICs like SE BASIC or Gosh Wonderful there's no need to bother with the leading %.
Additionally, commands which are not present as Spectrum keywords (such as LOAD and SAVE) may be
entered as upper or lower-case (or a mixture), although they are always shown in capitals on this manual. If you
are using a single-character-entry BASIC, then they will usually accept keywords in lower-case as well.
Finally, commands can be abbreviated, to save you from having to type in the entire command name. This is
done by adding a "." character to the partial command name. ResiDOS will make a guess at the command desired
and fill it in for you.
As an example of the flexibility of the system, here are a number of ways to enter the same command (which
lists the partitions on your flashdrive):
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%PARTITIONS
PARTITIONS
partitions
%Partitions
%PAR.
p.
Entering functions
From v1.81, ResiDOS contains its own built-in functions, that can be used as parts of expressions in the same
way as other functions. They are entered as if they were user-defined functions, as the FN keyword followed by
the function name and a list of parameters in brackets. Optionally, you can use a % sign between FN and the
function name. A couple of examples of using ResiDOS functions in expressions are:
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6
GOTO FN ERL()+1
PRINT 100*FN %ERR()