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1993-07-19
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Path: menudo.uh.edu!usenet
From: mguthrie@cedar.az05.bull.com (Matt Guthrie)
Newsgroups: comp.sys.amiga.reviews
Subject: REVIEW: Commodore A2386SX Bridgeboard
Followup-To: comp.sys.amiga.emulations
Date: 19 Jul 1993 18:50:16 GMT
Organization: The Amiga Online Review Column - ed. Daniel Barrett
Lines: 325
Sender: amiga-reviews@math.uh.edu (comp.sys.amiga.reviews moderator)
Distribution: world
Message-ID: <22eqd8$4ag@menudo.uh.edu>
Reply-To: mguthrie@cedar.az05.bull.com (Matt Guthrie)
NNTP-Posting-Host: karazm.math.uh.edu
Keywords: hardware, emulation, IBM PC, MS-DOS, 80386, commercial
PRODUCT NAME
Commodore A2386SX Bridgeboard
BRIEF DESCRIPTION
(From the User's Guide:) "The Amiga Bridgeboard is an expansion
board that gives your Amiga IBM PC/AT compatibility, while retaining all the
Amiga's advanced features."
The bridgeboard comes with necessary floppy drive cables, a User's
Guide, a Commodore MS-DOS (ugh!) 5.0 Reference Manual, and the usual
warranty registration card and FCC Statement (at least here in the U.S.).
Mine also included a "Bridgeboard Addendum" stating that my bridgeboard was
shipped with an upgraded 386SX processor (a 25MHz model, rather than the
usual 16MHz or 20MHz). The 5 included floppy disks were: Amiga Janus, PC
Janus, and MS-DOS 5.0 (3 disks).
AUTHOR/COMPANY INFORMATION
Name: Commodore Business Machines, Inc.
Address: 1200 Wilson Drive
West Chester, PA 19380
USA.
(Commodore has different addresses outside the U.S.)
LIST PRICE
$999 (US) is the last list price I have seen, but no one is paying
more than $200-$250 here in the USA. I paid $208.30 (US) to have it
delivered to my door (after an 11-week wait).
SPECIAL HARDWARE AND SOFTWARE REQUIREMENTS
HARDWARE
The documentation states that the bridgeboard may be
installed in any A2000 or A3000 series Amiga. AGA machines
are not mentioned.
No minimum memory requirement is mentioned. The bridgeboard
uses its own RAM and comes with 1MB onboard (expandable to
8MB).
A hard drive is not required, although the documentation
states that running from floppy disks is slower, and
requires more frequent disk swapping (no kidding!). (Note:
the INSTALLATION section of this review assumes a hard drive
installation. If you don't have a hard drive, you're on
your own. Why didn't you buy a hard drive instead of a
bridgeboard?)
SOFTWARE
The bridgeboard works under both Release 1.3 and Release 2
of the operating system. (Again, AGA machines are not
mentioned.)
MACHINE USED FOR TESTING
Amiga 3000, 25MHz
2 MB Chip RAM, 4 MB Fast RAM.
2 internal floppy drives: 1 normal, 1 dual-speed.
2 internal hard drives: 52MB and 212MB.
AmigaDOS version: 2.04
Kickstart: version 37.175
Workbench: version 37.67
INSTALLATION
The hardware installation instructions are clear and have several
illustrations to help you. There are separate installation sections for
A2000's, A3000's, and A3000T's. It is important to follow the manual since
there are some jumpers on the bridgeboard that need to be set prior to
inserting it into your Amiga.
The trickiest part of the installation is deciding what your floppy
setup is going to be. You can use PC floppy drives in an internal bay, you
can declare Amiga floppy drives as "PC Only" or "Shared", and you can connect
external Amiga drives directly to the bridgeboard. There are several
combinations, but in any event, no more than 2 floppy drives are accessible
by the bridgeboard. I opted to declare my dual-speed floppy as shared, and
not connect the normal floppy.
Depending on your choice of floppy drives, you set the jumpers,
connect the cables, and plug in the board. It was a somewhat tight fit, but
I found that "see-saw"-ing the board (first one side, then the other) got it
in.
Installing the software comes next. The Amiga Janus uses the
standard Installer utility, and I had no problems there. You can create an
Autoboot virtual drive at this point or later; I chose later. Two programs
from the Amiga Janus disk are worth mentioning. PCPrefs is a utility to
define bridgeboard parameters. You need to declare at least your floppy
drive setup and video mode (monochrome or color) before you can boot the
bridgeboard. The manual explains the necessary options quite well. Flipper
is a utility that automatically detects whether the disk you insert is a DOS
or AmigaDOS disk.
The hardest part of the install for me was repartitioning my hard
drive. I had been using a dedicated partition with IBeM (a software PC
emulator); since the bridgeboard uses a virtual drive (one big file on the
Amiga side), I had to back up my partition to DOS floppy, delete the
partition, and then make the new virtual partition and restore all my
software. What a pain. Those of you moving up from software emulators, set
aside some time for this. Again, the instructions on making a virtual drive
are clear. The manual states that you should add 30 to 50 buffers per
megabyte of virtual drive size to the partition with the virtual drive.
This visibly speeds up performance. I made a 20MB partition and did not
create a JLINK drive, which is a non-booting virtual drive that grows as you
fill it (an Autoboot drive has a fixed size).
You then boot the bridgeboard and run the BIOS Setup utility. You
have now crossed over to the DOS domain (novice adventurers beware!). You
again have to declare your floppy configuration and video mode. If you have
additional RAM or a dedicated hard drive, you also declare those here.
Now comes the first real problem I ran into. The section of the
User's Guide that covers DOS installation tells you very little; it
frequently refers to the "DOS User's Guide" (I assume they mean the DOS
Reference Manual) and its instructions on using the DOS installation
utility. Well, the DOS Reference Manual is a straight reprint of the
Microsoft one, and Microsoft publishes the installation instructions in a
separate booklet, "Getting Started with MS-DOS," which Commodore does not
include with the bridgeboard. Fortunately, I have done this several times
before. After you exit the BIOS setup, the bridgeboard reboots. If you
hadn't inserted the first MS-DOS diskette yet, do so, then give the
bridgeboard the DOS variant of the 3-fingered salute to reboot:
Ctrl-Alt-Del. DOS is then booted from floppy. Now you must format your
virtual hard disk. The manual states that FDISK and FORMAT are run by the
DOS installation utility automatically; I ran them myself. They are both
straightforward to use, and explained in detail in the DOS Reference
Manual. To install DOS, just type "install" at the DOS "A>" prompt. It
walks you through.
I also had problems installing the PC Janus software. It doesn't
completely install if you follow the instructions in the guide, which tell
you to enter "xcopy a:\janus c:\janus". After typing that, you must also
type "xcopy a:\dos c:\janus" to get the rest of the Janus files to your hard
drive. Appendix E shows that all of the DOS files are supposed to be in the
Janus subdirectory, but in fact, the following four files are in the \dos
subdirectory: keyboard.com, keyboard.sys, emm.sys, and bbsetup.com.
REVIEW
Since the bridgeboard is so versatile, I will not spend much time in
this REVIEW section. I have not tried many things that others will;
hopefully some other people will post their experiences. Some notes about
expansion, though:
RAM -- the bridgeboard uses 80ns page mode ZIPs. (The 16MHz model
can use 100ns ZIPs.) It comes with 2 of the 4 banks filled with 256Kx4
chips; you can add 1MBx4 chips 1 bank at a time, or replace the 256Kx4 chips
with 1MBx4 chips.
Hard disks -- you can add a dedicated PC hard disk, which supposedly
runs much faster than the virtual drives. Using the ADISK utility, you
can even have an Amiga partition on the PC hard drive.
FPU -- you can add an 80387 numeric coprocessor to the board.
Video adapters -- the Amiga supports MDA (monochrome) and CGA modes
through the native display. If you add a video adapter board, you must hook
up a monitor directly to the adapter card. In my opinion, this woul