Instruction manual

Page 6 Installation Instructions: AM-212-20 3-1/2" Floppy Diskette Drive
PDI-00212-20, Rev. A01
Modifying the System Initialization Command File
In order to use your diskette drive, you must define it in the system initialization file. First use the
COPY
command to make a copy of your current system initialization command file, calling it
TEST.INI
. For
example:
LOG SYS:
COPY TEST.INI=AMOS32.INI
Then edit
TEST.INI
using the AlphaVUE text editor, making the modifications discussed in the
following sections.
WARNING! NEVER modify the system initialization command file directly. Always make a
copy and modify the copy. If you modify your
AMOSL.INI
or
AMOS32.INI
file directly and
make a mistake, your computer may not boot! If you make a copy, you can test your changes
using the
MONTST
command, as described below, then rename the test command file to
AMOSL.INI
or
AMOS32.INI
only when you know it works correctly.
The following sections describe the steps required to define a diskette drive in your system initialization
command file.
Modifying the Device Table
The first thing you need to do in your
TEST.INI
file is add a new
DEVTBL
statement. In the system
initialization file,
DEVTBL
tells
AMOS
which devices to look for on the computer. The
DEVTBL
lines
in bold below define 3.5" diskette drive formats.
DEVTBL DSK
DEVTBL FLH0 ;AM-SCSI format high density diskette
DEVTBL FLD0 ;AM-SCSI format double density diskette
Adding a BITMAP statement
The next step is to add a
BITMAP
statement for the diskette drive.
BITMAP DSK
BITMAP FLH,179,0 ;bitmap for high density AM-SCSI
BITMAP FLD /P:89 ;paged bitmap for double density AM-SCSI
This is only an example. Make sure the
BITMAP
statements you add use the correct device names
and bitmap sizes for your diskette formats.
The following gives the correct bitmap sizes for the supported diskette formats: