RE: Upgrade 2040/3040 DOS 1 floppy drive to DOS 2?

From: Hoffmann-Vetter, Martin <>
Date: Sun, 1 Aug 2010 00:28:07 +0200
Message-ID: <001201cb30ff$a7c12d80$1b09a8c0@mhvnb10>

> By the way, would the power supply from a 8050 drive be compatible
> with the power supply in a 3040 drive, considering voltages and
> connectors?

Pin  8050    4040
---  ------  ------
 1   AC_5V   AC_5V
 2   AC_5V   AC_5V
 3   DC_5V   DC_5V
 4   Key     Key
 5   DC_12V  DC_12V
 6   AC_12V  AC_12V
 7   AC_12V  AC_12V
 8   GND     GND
 9   GND     GND

Pining for 8050 from schematic out of service manual 314011-03 Page 27

Pinnng for x040 from schematic 320806 Page 3

It must be totally the same. The PSU is also identical. They transform the
AC to DC and regulate it to 12V and 5V. The Pin DC_5V, GND and DC_12V, GND
are for the external capacitors near the transformer. AC_5V and AC_12V goes
to the transformer. I don't know the correct voltage of the transformer, so
i named it with the output DC voltage in the table above.


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Received on 2010-07-31 23:00:38

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