Re: 1541 Assy# 250442

From: William Levak <*wlevak_at_SDF.ORG*> Date: Tue, 22 Nov 2016 05:35:09 +0000 (UTC) Message-ID: <Pine.NEB.4.64.1611220533090.25332@sdf.lonestar.org> · wlevak_at_SDF.ORG

I have the schematic for 250442.  UD4 is a 9602. Sams Photofact says to 
use a NTE9602 or ECG9602.

On Mon, 21 Nov 2016, silverdr@wfmh.org.pl wrote:

> Do we have correct schematics for this 1541 board?
>
> It uses 74LS123 in place of DM9602 but all the schematics I found refer to the 9602 mulitvibrator, which - as Ruud noticed here:
>
> http://www.baltissen.org/newhtm/1541a.htm
>
> seems not to be a drop-in replacement. Also I found that:
>
> http://www.zimmers.net/anonftp/pub/cbm/schematics/drives/new/1541/boards.txt
>
> says: "1541A2   250446-01   A 74LS123 replaces the 9602 at UD4" but all 250442 I have are already equipped with '123
>
>
> -- 
> SD!
>
>
>       Message was sent through the cbm-hackers mailing list
>
>

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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