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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 would suck.
- I have heard vague accounts of switchers that will allow you to use one
- monitor with two RGB inputs. If I get a VGA board, I will certainly invest
- in one of these. Another drawback is that you cannot see the PC screen on
- the Workbench (or use Amiga-M to toggle screens) because you must disable
- the MDA/CGA emulation if you install an adapter board.
-
- Printing -- the bridgeboard can use the Amiga's serial or parallel
- ports for printing. On the Amiga side, you run a program which gives
- control of the PAR: or PRT: device to the bridgeboard.
-
- Modems -- you must install an internal modem card or a serial card
- for the bridgeboard to use; it cannot use the Amiga's serial port for
- modem access.
-
- I use the bridgeboard to run Quattro Pro and PAF (Personal Ancestral
- File, a genealogy program). For DOS programs such as these I find the
- bridgeboard works quite well. You may quite logically argue that a '386
- is overkill for such applications. In the future I plan to add a
- multipurpose board like the Cardinal SoundVision and run Windows or Linux.
- I also plan to try some (S)VGA games. (When I do, I will post a followup
- review.)
-
- Here are some performance numbers from Norton's SI utility, both for
- the bridgeboard and my '386/33 at work (by the way, a rating of 1.0 is
- equivalent to an 8088 XT):
-
- Bridgeboard (in CGA mode) PC
-
- CPU speed: 18.9 36.0
-
- Hard disk: 4.6 7.2
- Avg seek: 0.0 14.86 ms
- Track-track: 0.0 3.60 ms
- Xfer rate: 348.8 KB/sec 747.3 KB/sec
-
- Overall: 14.1 26.3
-
- Note: When running on the bridgeboard, Norton warned that an
- "advanced disk controller" was found. Apparently, such controllers are
- often designed such that they only move the heads when data is actually
- read/written (so the seek times are invalid -- as if you couldn't tell). It
- also warned that all numbers for the hard disk are probably better than
- actual. I suppose you really want a dedicated hard disk if you are doing
- disk-intensive work.
-
-
- DOCUMENTATION
-
- Included documentation is the A2386SX Bridgeboard User's Guide and
- the Commodore MS-DOS 5.0 Reference Manual. The MS-DOS Reference Manual is
- straight from Microsoft, so it is as good (or bad) as anything that
- Microsoft does. The bridgeboard user's guide is professionally printed,
- easy to read, and, aside from the errors noted in INSTALLATION, accurate.
- The appendices contain handy technical information.
-
-
- LIKES AND DISLIKES
-
- The ability to run programs like Quattro Pro and have the system keep
- up with my keystrokes is nice ;-). My software-only emulator dragged
- terribly.
-
- I can finally access 1.44MB floppies! IBeM with the MSH filesystem
- couldn't handle these. (Of course, I could have bought CrossDOS or AmigaDOS
- 2.1, but I hate buying commercial software unless I really have to, and I'm
- waiting for AmigaDOS 3.1.)
-
- AREAD and AWRITE are cool. They allow you to copy a file from an
- MS-DOS filesystem (hard drive or floppy) to any Amiga volume.
-
- The Flipper program that detects whether you inserted a PC or Amiga
- floppy in a shared drive is a little slow. Having installed *numerous*
- multidisk software packages on PC's, I like to hit the Return key as soon as
- I have inserted the next disk. You can't do that with my setup; you have to
- wait about 2-3 seconds for Flipper to react. Otherwise, the read is
- corrupted, and you have to reinstall. The solution, of course, would be to
- have a PC only floppy drive. Oh, well. At least I can listen to a MOD
- while installing DOS software.
-
- The method of partitioning a hard drive for MS-DOS use is more
- intuitive to me than the bridgeboard's method of using one big file as the
- DOS filesystem. I would think it would be faster, too, but who knows? It
- would have been nice to avoid the hard disk reorganization, but that is a
- relatively minor complaint.
-
- My ego would be greatly bolstered if my bridgeboard had faster Norton
- numbers, but I suppose the decrease is due to communication between the
- Amiga and the bridgeboard. It is unrealistic to suppose that the
- bridgeboard will be as fast as a straight PC with the same processor.
-
- Colors can be a problem. When I first started Quattro Pro, I was
- running in mono mode, and I couldn't see anything. I switched to CGA and it
- worked fine. Other DOS programs may have similar difficulties.
-
-
- COMPARISON TO OTHER SIMILAR PRODUCTS
-
- I have used IBeM, a shareware software-only emulator. It boots much
- faster than the bridgeboard, but of course, runs much slower. The IBeM
- documentation claims approximately XT speed on a 3000/25 setup such as
- mine. (I could never run Norton's SI -- I got a division by zero error,
- due, I presume, to IBeM's not implementing the real-time clock. I wonder
- what the numbers are like on CrossPC.)
-
-
- BUGS
-
- The only bugs I've found were in the documentation, as I mentioned
- in INSTALLATION. Of course, there are many things I haven't tried yet.
-
-
- VENDOR SUPPORT
-
- I've never contacted the vendor for support, but I did send email to
- Dave Haynie once.
-
- I'm not affiliated with Commodore in any way, but I'm thinking about
- buying stock and joining the "Oust Irving Gould" campaign.
-
-
- WARRANTY
-
- There is a one year warranty on manufacturing defects; it is
- non-transferable.
-
-
- CONCLUSIONS
-
- The bridgeboard does everything it purports to, so far as I can tell.
- As I said before, I plan to post followups when I expand the PC side of my
- Amiga.
-
- I would enjoy hearing from other bridgeboard users, especially those
- who have installed expansion boards or other peripherals, *or* alternate
- operating systems. My email address is m.guthrie@bull.com.
-
-
- COPYRIGHT NOTICE
-
- This review is freely distributable, as long as the content remains
- unchanged.
-
- Matt Guthrie, mguthrie@cedar.az05.bull.com
-
- ---
-
- Daniel Barrett, Moderator, comp.sys.amiga.reviews
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