RANA Systems RanaSystems 13-0010--001, User Manual

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ELITE SERIES USER MANUAL CP/M ENHANCEMENTS
The final "mount" message comes from the section
of SGLDRIVE which is left in memory as part of
the operating system (CP/M) after the bulk of
SGLDRIVE goes away. This extra little “resi-
dent” section of SGLDRIVE does not consume any
of the user’s memory. It is loaded into that
section of the operating system which is only
required if you have more than one drive. And,
since you don’t have more than one drive (other-
wise you wouldn’t he running SGLDRIVE), this
section of the operating system can he used for
other purposes.
Once this “resident” portion of SGLDRIVE is
loaded, CP/M as an operating system will begin
recognizing two different drives (A: and B:),
even though you only have the one physical drive
attached to your Apple. SGLDRIVE “fools” CP/M
into seeing another drive by constantly watching
which drive CP/M (and standard programs running
under CP/M, such as PIP) is trying to talk to at
any particular time. Whenever CP/M changes from
trying to talk to drive A: to trying to talk to
drive B:, SGLDRIVE displays the message:
Mount B:, Press <ESC>
This gives you a chance to remove the diskette
which CP/M thinks is the one in drive A:, and
insert the diskette which CP/M thinks is in
drive B:. Once you press:
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