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A1200HardFAQ.txt
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1995-03-03
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A1200 Hardware Frequently Asked Questions
Version 1.0
-----------------------------------------
Copyright © 1995 by Warren Block.
Distribution
------------
This document is FreeWare. It has been copyrighted to assure its availability
to everyone. Fred Fish and the Aminet are explicitly allowed to include this
document in CD-ROM or floppy compilations; others should ask first.
Disclaimer
----------
The information contained herein is a crock. It's full of dangerous errors,
omissions, and outright lies, and is not guaranteed to do anything other than
take up disk space. Not for internal use. Keep out of reach of demo coders.
Introduction
------------
After putting together a much fancier document for the A4000 (the Amiga 4000
Hardware Reference Guide), it was suggested that a something similar was
needed for the A1200. Additionally, I kept seeing the same questions asked
over and over in comp.sys.amiga.hardware, and it seemed like a FAQ might help
both those asking and answering the questions. Maybe it'll just change all
the answers to say "Read the FAQ, you moron." Nah. Amiga people are more
polite than that. They'd say "PLEASE read the FAQ, you moron."
Introductory Questions
----------------------
Q. I have a problem with my A1200. Can I email or call you for help?
A. I'd rather you ask any questions that aren't answered here in a public
forum in comp.sys.amiga. That way, you can draw on more experience than
just my own (which is admittedly somewhat limited with the A1200), and the
answers can benefit others with similar problems.
Q. Hey! You left out many details on some of these topics.
A. That was intentional; some of these answers have been simplified, both to
keep this document relatively short, and to avoid confusing the issues.
Please remember that this is an introductory document, and not a technical
reference guide, and is intended merely to answer the most common
questions. Nyah.
Q. Hey, FAQ boy, you screwed up, and some of this information is wrong, or
you just didn't include something that was completely obvious! Can I send
you email with the correct information?
A. Yes, please do. I am:
Warren Block
602 St. James
Rapid City SD 57701
(605) 342-1632 Voice
wblock@silver.sdsmt.edu
Thank you for your interest, and good luck with your A1200!
------------------------------------------------------------------------------
Power Supply
------------
Q. I want to build a "super power supply" for my A1200. What are the pinouts
of the power supply connector?
A. Look on the power supply itself, where the pinouts are specified.
Q. Can I use an Amiga 500 power supply with my A1200?
A. Yes. The connectors and voltages match perfectly.
Q. What about the higher watt rating of the A500 supply? Won't all that extra
power melt and/or blow up my A1200?
A. No. The watt rating of a power supply only describes the absolute maximum
amount of power it can supply. The A1200 will only draw as much of this as
it needs to operate.
Floppy Drives
-------------
Q. Can I use an IBM high density drive on an A1200?
A. Not easily, simply, or reliably. There are some hacks that allow this,
but, as of this writing, they all still have problems, and can be
considered experimental. If you're determined to try, there are several
plans in the hard/hack section on Aminet.
Q. Can I read and write Amiga diskettes on a PC clone?
A. No. The floppy controller hardware on the clones is incapable of reading
or writing the Amiga disk format. To transfer files on disk between a PC
clone and an A1200, use 3.5-inch low-density floppies formatted in the
720K MS-DOS format. The A1200 can read and write these using CrossDOS
(included with 3.0).
Q. Can I use high-density floppies with the A1200's normal disk drive?
A. Not reliably! Writing high-density disks with a low-density drive will
result in erratic operation of those disks. They may work fine for hours,
days, or weeks, only to fail when you need them most. The low-density
drives just can't write reliably to high-density disks. Use low-density
disks with Amiga low-density (880K) drives, like the one built into the
A1200.
Hard Drives
-----------
Q. Why doesn't my A1200 boot off the hard drive when I first turn it on?
A. Many hard drives don't spin up fast enough to be ready when the A1200
is ready to boot. If you can reset the A1200 after it comes up with the
purple "insert floppy" screen and it will then boot from the hard drive,
this is the case. The easiest solution is to just live with it by
resetting the machine when you first turn it on. If this really bothers
you, you could replace the drive with one that spins up faster.
Q. How hard is it to install a hard drive inside my A1200?
A. It's not hard. You need a few things: a 2.5-inch IDE hard drive (commonly
used for notebook computers), a short section of special 44-pin ribbon
cable to fit the drive (this cable is spaced more tightly than normal
ribbon), and, preferably, the Commodore Install disk. First, you install
the drive, then use the Install disk to partition it and place the system
software on it. That's it. The toughest part is obtaining the Install disk
and the special cable.
Q. When should I low-level format the hard drive?
A. On both IDE and SCSI drives, an initial low-level format has been
performed at the factory. You should never need to low-level format them
again. After partitioning, you *do* need to "high-level" format a hard
drive with the AmigaDOS Format command; when used with hard drives, you
can specifiy the QUICK keyword with the Format command to speed up this
high-level formatting immensely.
Q. Can I use a 3.5-inch hard drive inside my A1200?
A. Not without hacking it in there. Physically, it can be made to fit;
but problems can arise from the extra power consumption of the 3.5-inch
drives, coupled with the anemic stock power supply of the A1200. Obtaining
a cable to adapt the 44-pin high-density IDE cable to the 40-pin
normal-density IDE connector can be difficult, too.
Q. Can I use an "EIDE" or "Fast ATA" hard drive with the A1200?
A. Yes. These drives are merely refined IDE drives.
Q. Will large-capacity (500M and up) drives work with the A1200?
A. Yes. The 500M capacity "limitation" originates from the PC clones, and is
only a problem with them. For the Amiga, you can safely go up to a 2G
(~2000M) hard drive, provided you can find (and afford) one that large in
a 2.5-inch IDE or EIDE format.
Q. What is MaxTransfer?
A. MaxTransfer is a value (set in HDToolBox) that limits how much data can be
transferred to or from the hard drive in one "gulp."
Q. Why is MaxTransfer needed? Shouldn't the drive move as much data at one
time as possible?
A. Yes, it should, but some hard drives have arbitrary limits on how much
data they can move at one time. On the Amiga, if you have problems
transferring files of 100K or larger to or from the hard drive, this is a
likely cause of the problem.
Q. I have have no idea what the MaxTransfer value should be for my drive.
What value should I use?
A. For unknown drives, the maximum "safe" value is 0x0001FE00.
Q. What drives are known to need the "safe" MaxTransfer values?
A. As of this writing, some Maxtor drives need the maximum safe MaxTransfer
value of 0x0001FE00.
Q. What is Mask?
A. Mask is a value (set in HDToolBox) that determines what type of memory
(Chip or Fast) can be used to buffer data transfers to or from the hard
drive. Unless you have a good reason to change it, leave it at the default
setting in HDToolBox.
Q. What 2.5-inch IDE hard drives are known to work with the A1200?
A. Most do, although you may have to adjust the MaxTransfer value (see
above). I personally dislike the Seagate drives included with many A1200s
(I consider them the Kraco of hard drives), but they work fine for many
people. My own Toshiba works fine, although, like many drives, it has the
"slow spin-up" problem.
CD-ROM Drives
-------------
Q. What SCSI CD-ROM drives work with