RE: 8250 to 8050

From: Hoffmann-Vetter, Martin <*martinhv_at_arcor.de*> Date: Mon, 13 Dec 2010 16:31:37 +0100 Message-ID: <002401cb9ada$d5d20510$1b09a8c0@mhvnb10> · martinhv_at_arcor.de

Hello,

> Few weeks ago, I have seen a DOS command which turned the 8250 drive
> (double sided) into 8050 (single sided). This would be very useful for
> me in order to download some D80 discs. But I cannot find this code
> anymore. Can you help?

The logic board from a 8250 and a 8050 is the same. So you can switch between via a jumper. I think this is Pin 18 from the RRIOT (6530) of the DC (Disc Controller) at UK3 or UAB3. Have a look in the schematics on http://www.zimmers.net/anonftp/pub/cbm/schematics/drives/old/8050/. I think it must be E4?

I remember, this jumper was in my 8250 a switch. After i toogle this switch, i must reset the unit!

Greetings from Germany

Martin

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