Re: 2031LP 75161 wiring question

From: Mike Stein <*mhs.stein_at_gmail.com*> Date: Sat, 4 Aug 2018 14:42:01 -0400 Message-ID: <54355497037849B7B32C0D396C1B515E@310e2> · mhs.stein_at_gmail.com

----- Original Message ----- 
From: "William Levak" <wlevak@SDF.ORG>
To: <cbm-hackers@musoftware.de>
Sent: Saturday, August 04, 2018 1:48 PM
Subject: Re: 2031LP 75161 wiring question

On Sat, 4 Aug 2018, William Levak wrote:
...
> I opened up my 2031. The chips are TI SN75160N and SN75161AN. The only 
data sheet I could find was for the SN75161B, which apparently has a 
different pinout.
--------------------------

FWIW, my 2031LP and HP drives both use TI SN75160AN and SN75161AN ICs.

As far as I can tell, in the LP pins 11, 12 and 19 of the '161 are all n/c.

What's different in the pinouts? At a fast glance the '161B data sheet seems to match the 2031 p.12r schematic exactly; did I miss something?

m