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   Message 56 of 190
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   Re: C128D  more options
   
   
   Author:   Nicolas Welte
   Email: welte@chemie.uni-konstanz.de
   Date: 1998/12/29
   Forums: comp.sys.cbm
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Cameron Kaiser wrote:
> Non-addressable storage bit? I thought that a Speicher was an attic, though :
-)
>
> I'll save you some trouble -- the 1581 manual, at least in the U.S., doesn't
> even break down the command parametre. As far as it's concerned, you get all
> eight bits -- doesn't say anything about bit 7 being reserved.

Have a look at chapter 7.1., there is an example that deals with the
REVCNT variable. Here is the English version from Project64:

EXAMPLES:

  To  see  how many tries the disk will make to read a particular
sector,  and  whether  "bumps"  to  track  one  and  back will be
attempted before declaring the sector unreadable, you can use the
following  lines.  They  will read a special variable in the zero
page  of  disk  memory,  called  REVCNT.  It  is  located  at $30
hexadecimal.

And here's the German translation from my manual:

Beispiele:

  Das folgende Programmbeispiel kann verwendet werden, um sich anzeigen
zu lassen, wie viele Versuche das Laufwerk unternimmt, um einen
bestimmten
Sektor zu lesen und, ob versucht wird, auf Spur 1 und der
Diskettenrückseite
nicht adressierbare Hilfsspeicher anzulegen, bevor der Sektor für nicht
lesbar
erklärt wird. ...


The whole translation of that manual into German is bad, but errors like
these render the manual completely useless. Not only that they
translated 'bump' with that 'nichtadressierbare Hilfsspeicher', they
also translated 'back' with 'Diskettenrückseite', which is completely
stupid in this context. One or two pages later the same error is made
again in another example. The translation of the 1571 manual was _much_
better.

In the description of the M-W command, there is another mistake, but
this time its in the English version as well. The say that bit 7 of
REVCNT is responsible for the bump, the lower 6 bits represent the retry
value and that the maximum number that can be stored in 6 bits is 31.
That's not true, you can store numbers up to 63 in 6 bits. Bit 6, which
was used for the retry on halftrack feature in the 1541/70/71, is not
used anymore in the 1581. Therefore a bitmap of the REVCNT variable in
these drives would look like:

bit 76543210   of memory location 106
    BHRRRRRR   5,25" drives, B=bump,H=halftrack,R=retries
    BXRRRRRR   3,5"  drives, B=bump,X=don't care, R=retries

Nicolas
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