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From: hase@netmbx.UUCP (Hartmut Semken)
Newsgroups: comp.sys.atari.st
Subject: Re: PC-Speed
Message-ID: <3075@netmbx.UUCP>
Date: 15 Jul 89 16:16:24 GMT
References: <221@nikhefh.hep.nl> <930@pedsga.UUCP>
Reply-To: hase@netmbx.UUCP (Hartmut Semken)
Organization: netmbx Public Access Unix, Berlin, West Germany
Lines: 35

In article <930@pedsga.UUCP> mikes@pedsga.UUCP (Mike Shulman,SPCSYS,7586) writes:
>In article <221@nikhefh.hep.nl> l86@nikhefh.hep.nl (Hugo Burm) writes:
>>all ran immediately. They had some problems with copy-protected games
>                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>(as expected) and non-Atari hard disk drivers (they are working on the
> ^^^^^^^^^^^^^
>>latter).
>
>Why is it expected that the emulator should have problems with
>copy-protected games? I would think that if you can read an IBM
>disk correctly, the program should run... By the way, can you
>hook up a 5 1/4 drive to PC-Speed?

The problems are with the different floppy controller: the WD 1772
(Atari) and NEC 765 (PC) are equivalent in reading/writing standard
floppy disks (9 sectors of 512 bytes per track). They are not the same
in recognizing copy protection shemes...

Of course it is possible to connect a 5 1/4 inch drive to the ST.

The ST has a standard Shugard bus (with nonstandard connector :-).

It is easy to install a 80-Track 5.25 inch drive.
There is a problem with 40-track drives: the ST issues a step impulse
every 3 milliseconds. 40 track drives need about 6 millisaconds for a
step.

The seek time can be changed by patching the drive parameter blocks, but
the adress varies from TOS version to TOS version...

hase
-- 
Hartmut Semken, Lupsteiner Weg 67, 1000 Berlin 37 hase@netmbx.UUCP
If there is something more important than my Ego, I want it caught and shot.
Now! (Zaphod Beeblebrox)