Re: "Mystery" 1571.

From: Nicolas Welte (
Date: 2000-08-06 13:42:40

Martijn van Buul wrote:
> Somehow, I don't understand how a "1570" board ends up with a new ROM..

I have at least two of those boards, and all were in 1571 drives. All my
1570 drives came with a board labeled "1571" ;-)

If you examine the "1570" board closely, you will see that all the
traces that have to be cut for the 1571->1570 conversion are already
open, the points where the wires have to be connnected to have white
arrows and so on. To make that board work in a 1571 again, all that has
to be done is put bridges over the open traces. One nice change is that
diode that is always connected to one of the transistors near the R/W
head plug: They put it into the board layout, finally. Oh, I forgot: The
1570 doesn't have the transistor for 5V/12V selection on the stepper
motor. But this is also just a manufacturing option, like the jumper
wires and the different ROM.


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