Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ULKYVX.BITNET!WSCART01
From: WSCART01@ULKYVX.BITNET
Newsgroups: comp.sys.atari.st
Subject: Mega2 hardware questions...
Message-ID: <8907250426.AA12717@jade.berkeley.edu>
Date: 25 Jul 89 04:20:00 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: University of Louisville
Lines: 35


Help! That sums up the mood i'm in.

I bought a mega2 about 4 months ago. (Yes, out of warrenty.) I've had some
disk compatablitiy problems. Nothing big, but it seems that my RPM is a bit
on the high end of the scale. I've adjusted drive speeds before, but I
couldn't on the Mega2. I couldn't find a control pot for the motor. There
was a small variable pot but it seemed to be hooked to the stepper moter.
(I tried it anyway, but it didn't make any difference.) There was a bunch
of resisters on the board, i'd hate to think that the speed is hard wired.
Tell me is isn't so! (If it is, which one controls the speed?)

SIDENOTES:

 There was a little magnet along with, i guess, a magnetic sensor. What is
this for? (Is the drive speed, chip controled?)

 I noticed spaces for 1 meg memory chips. (2 megs worth) Other than the
holes being soder filled, and missing the corresponding compacitors; is the
computer upgradeable to 4 megs just by putting in the 1 meg chips and the
compasitors? (What type of compasitor should be used? Also what speed of
meg chip is preferable, 120ns or 100ns?)

The 68000 is soldered to the board.

4 empty sockets wait for tos 1.4

Nice open bus waits to be used. (Anyone know of anything that makes use
of it? Kisses to Atari for haveing it an open bus.)



Stuart Carter
University of Louisville
Physics Dept.