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- NOTICE: This article originally appeared in the February issue of Atari
- Interface Magazine and may be freely distributed or reprinted in non-profit
- User Group publications as long as the article's author and Atari Interface
- Magazine are credited AND this notice is reprinted with the article. All
- other publications must obtain written permission from Unicorn Publications,
- 3487 Braeburn Circle, Ann Arbor, MI 48108, Phone: (313) 973-8825 before using
- this article.
-
- Phantom Drives and the SH204
-
- Or...How My Hard Drive Did Funny Stuff with TOS 1.4
-
- Glenn Dulin (COAC)
-
- I had proudly, and with enthusiastic anticipation, installed TOS 1.4 in my
- 1040ST. I turned on my hard drive and then the computer -- and oooooh! -- I
- was impressed with TOS 1.4 and its new goodies. I like it! I like it! But
- wait...I noticed I was able to access a ramdisk that wasn't there (I had a G:
- icon on the desktop). I noticed DBman was accessing this drive that wasn't
- there. No errors! Uh oh! What are these ROMs doing to me? I just spent
- all
- this money for a BIG BUG! Were just MY ROMs faulty? I hadn't heard anything
- about this.
-
- Later, I talked to a friend, Bob Kanski, who is in the club. He asked if I
- had tried just booting from floppies. No, I hadn't. He had TOS 1.4
- installed
- and, using floppies, it didn't show any signs of this malady. I then booted
- off floppy -- no problem, no phantoms. That's fine, but I wanted to use my
- hard drive.
-
- In the meantime, Bob called another club member, David Powers, who had an
- SH204. When Bob got back to me, he taunted me and refused to tell me about
- some new information he got from Dave until he had extorted a promise that I
- would buy him a Coke. After I gave in to this extortion, he told me Dave had
- had the same symptoms when he had upgraded to TOS 1.2. Hmmm! I took my
- computer to Bob Stiles, who has a 50meg ICD and everything worked fine...no
- bug.
-
- So, what's the cure? It turns out that Atari's SH204 has a faulty chip with
- the insidious and devious name of AMPAL written on it. Even without a new
- TOS, this chip does not report errors back to the operating system correctly.
- You may do writes that didn't write correctly and no error would be reported.
- It may do incomplete seeks or corrupt formatting or have uncorrectable data
- reads. It just so happens that this chip also allowed the phantom drive
- syndrome. I could have G: on the desktop but not installed, and whenever I
- pulled up the file selector, I also got drives F: and H: that were not
- installed or on the desktop. And, yes, you could get a directory off of
- these
- drives. It was, however, a directory of a real drive, usually the last real
- one you accessed.
-
- Enter Berkeley Microsystems and the ADE (Atari Drive Enhancement). On Dave's
- advice, who cured the problem with the ADE, I sent for the chip, and with
- about ten minutes of work I had it installed in the SH204. The installation
- is easy, TOS 1.4 works like it should and the three of us are now living
- happily ever after.
-
- Even if you don't get your TOS upgraded, I would recommend getting this chip
- for your SH204. It's cheap insurance against a possible corruption of the
- drive.
-
- ADE Chip $19.95 + $2 S&H
- Berkeley Microsystems
- P.O. Box 20119
- Oakland, CA 94620
- (415) 547-2191
-