Table of Contents
Advertisement
Section A:
System interface
************************************************************************
*
*
*
71 -
Check Drive Ready
*
*
*
************************************************************************
On entry:
c
47H
DE
Drive Number
On return:
A
H
0
or
0FFH
Bit Vector
Possible logical errors:
- none -
Possible physical errors:
- none -
Differences to CP/M plus:
New function.
Differences to CP/M 2.2 resp. DiCOS:
New function.
The
drive
denoted
by register
E
is checked if it is
ready
for
data
transfer.
A
value of
0
corresponds to drive
A,
1
to drive
B,
and
so
forth up to 15 for drive P.
If the drive is ready, A is set to 0FFH and
the bits in
H
are set as follows:
Bit
7
set
Bit 6 set
Data carrier cannot be removed.
Drive contains two-sided diskette.
If
the drive is not ready,
A is set to 0.
undefined,
A
is set to
7.
If the drive parameters are
It
should be noted that no physical drive access is done,
so the
disk
format will not be determined.
Hence,
subsequent read/write operations
can lead to errors.
EOS System manual
Daeumling
& Zimmermann
Page 99
Advertisement
Chapters
Table of Contents
