90x0, was: New user

90x0, was: New user

From: ruud.baltissen_at_apg.nl
Date: Wed, 15 Apr 2009 07:53:20 +0200
Message-ID: <3FAF2D74FB701448B997B2CB7A0076C20F4C0A64@winsv116.office01.internalcorp.net>
Hallo allemaal,

@ Hervé: Bien venue!

Ethan> ... and restored them.

What did you have to do?

Three years (?) ago I received three 9060's and one 9090 from Jaj Janssen (Duisburg, Germany) for repair, whom on its turn got them from Anders. After hearing this http://www.dienstagstreff.de/ gave me another 9060 to repair as well. I managed to get only one 9060 to life again :( Three harddisks were broken but this was not a problem as I found out that I could use Seagate ST-225's as replacement. Four DOS boards were brooken but I managed to repair two. The other two are repairable as well IMHO. But the biggest problem were, what I call, the "middle boards". These bords have been placed between the harddisk and the DOS board. They are equiped with a lot of, partly unknown, logic around a CPU like AMD-IC. They convert the SASI interface from the DOS board to the MFM interface of the harddisks. And I still wonder why C= designed things in this way. 

I have been trying to figure out how the SASI interface worked but without any good info on SASI and without any good source listings, I gave up: I needed the time for, IMHO, more important projects. But I intend to use the info gathered with my 1541IDE project to replace this middle board and MFM-HD with an IDE-HD.

    / __|__
   / /  |_/     Groetjes, Ruud
   \ \__|_\
    \___|       URL: Ruud.C64.org

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Received on 2009-04-15 08:00:57

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