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LSD and 17bit Compendium Deluxe - Volume II.iso
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Text File
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1994-11-04
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5KB
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140 lines
empcd.device 1.1
by Nicola Salmoria MC6489@mclink.it
This device allows the EMPLANT Mac emulation to use a CD-ROM drive not
connected to the EMPLANT SCSI port. Only Mac HFS discs are recognized;
ISO-9660 and audio discs cannot be used.
The device also provides a double buffered prefetch cache which
dramatically increases performance when playing QuickTime movies
directly from a CD-ROM.
Installation
------------
- Copy empcd.device to DEVS:
- Drag the EMPCD icon into the DEVS:DosDrivers drawer.
- Now you have to modify EMPCD, selecting the appropriate device and unit.
Please note that the device name is specified on the Control line, since
Device is already used by empcd.device. Unfortunately, the Control field
is not parsed by the Mount command supplied with Workbench 2.x. You have
to either find a newer version of Mount (v39+) or manually edit
empcd.device using a hex editor: change "scsi.device" into your device
name. Of course if your device is really called scsi.device, you don't
have to change anything. Remember to terminate the name with a 0.
The Buffers field is very important for performance. The default value
of 25 seems to be the best on my system. Your mileage may vary.
Don't set it too low, don't set it too high.
If you have a Zorro-2 DMA controller used on a 32-bit addressing machine
(A3000, A4000, some accelerated A2000 with memory on the CPU card) set
BufMemType to 513 (which tells the device to use memory in the 24 bit
addressing range).
- Now reset (or just double click on the EMPCD icon), and load MacII.
- Click on EMPCD in the left list of the Devices control window, then
click on the EMPCD which will appear in the right list.
If you didn't have to set BufMemType to 513, turn off DMA restrictions.
Turn on Write Protection as well - it won't be noticed otherwise.
Installation should now be complete.
Usage
-----
Due to the way Amiga devices are used by the EMPLANT software, you have to
start the emulation with a disc in the drive, otherwise the Mac will tell
you that the disk is bad, and ask you to format it - and you will not be
able to use the CD-ROM afterwards.
To change the disc, drag its icon on the trashcan, change the disc, wait
for the drive to recognize it, and select "Re-Mount Ejected" in the
Emplant window.
Frequently Asked Questions
--------------------------
Q. Does empcd.device support ISO-9660 or audio discs?
A. NO.
Q. Will you enhance empcd.device to make it support ISO-9660 and audio discs?
A. NO.
Q. Can empcd.device be enhanced to make it support ISO-9660 and audio discs?
A. NO. Hope it's clear now ;-)
Troubleshooting
---------------
Remember that empcd.device is NOT a product of Utilities Unlimited, Inc.
It is an add-on written by me, Nicola Salmoria, and all comments should be
sent to me.
Problem: When I boot the Emulation with a CD-ROM in the drive, a requester
asking me if I want to initialize the disk appears, and the disc icon
doesn't appear.
Possible Cause: The CD-ROM is not a Mac HFS disc. Only HFS discs can be used
with empcd.device.
Problem: When I boot the Emulation with a CD-ROM in the drive, an Amiga
requester appears, saying that the device couldn't be opened.
Possible cause: You probably haven't set up correctly the name and unit of
the device in the EMPCD mountlist. Remember that the name of the device
controlling the CD-ROM must be put on the "Control" line. Also remember
that if you are using a Workbench version < 3.0 and the device name is not
"scsi.device" you must use a hex editor to modify empcd.device directly.
Problem: The CD-ROM icon appears and I am able to open it, but some of my
discs don't work as expected.
Possible cause: empcd.device doesn't emulate the SCSI interface. Programs
sending SCSI commands or relying on other CD-ROM peculiarities will not
work. If you can, try the disc using the EMPLANT SCSI port. If it works
that way, it is probably not compatible with empcd.device. If it doesn't
work even when used via the SCSI port, it could be a problem with your
system configuration. Try the usual things, like disabling INITs, running
the emulation in 24-bit mode, and so on.
History
-------
1.1 [empcd.device 38.7 (18.10.94)]
- Fixed a bug which caused some controllers (like the A3000 scsi.device) not
to work.
- Now pops up an error requester if the underlying device couldn't be
opened.
- Enhanced the documentation
Legal Issues
------------
This software is FreeWare. It is freely distributable as long as the archive
remains intact, and only a nominal fee is charged for its distribution.
This software is provided "AS IS" without warranty of any kind, either
expressed or implied. By using it, you agree to accept the entire risk as to
the quality and performance of the program.
EMPLANT is a trademark of Jim Drew & Utilities Unlimited, Inc.
Apple and Macintosh are registered trademarks and QuickTime is a trademark
of Apple Computer, Inc.