[vcf-midatlantic] Looking for BR1951-L05 chips

Richard Cini rich.cini at gmail.com
Mon Nov 6 08:53:27 EST 2017

Thanks Jeff. I dug through my parts box last night and found a COM5016 and a few AY5-8116 chips. As you point out the 8116 is pin compatible (I didn’t know that before) as is the 5016.

The L06 chip apparently has a higher error rate (3%) at 9600 and 19200 baud than the L05, attributed to the divisor (x32) and the input clock.

I’m going to design the board with a few jumpers to allow for the power supply differences too and see how it goes. If I wind up needing them I’ll let you know.


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From: Jeff Galinat via vcf-midatlantic <vcf-midatlantic at lists.vintagecomputerfederation.org<mailto:vcf-midatlantic at lists.vintagecomputerfederation.org>>
Sent: Monday, November 6, 2017 8:44 AM
Subject: Re: [vcf-midatlantic] Looking for BR1951-L05 chips
To: <vcf-midatlantic at lists.vintagecomputerfederation.org<mailto:vcf-midatlantic at lists.vintagecomputerfederation.org>>
Cc: Jeff Galinat <jgalinat at optonline.net<mailto:jgalinat at optonline.net>>

On 11/5/2017 7:13 PM, Richard Cini via vcf-midatlantic wrote:
>                 Does anyone have a cache of these WD baud rate generator chips? I just mistakenly bought three of the L06 versions but it turns out I need the L05 version, the difference being the divisor (I think) and the crystal. I’m going to re-create a Seattle Computer board and it uses the L05 version, and the software relies on the right divisor.
>                 If anyone has spares, please let me know. Thanks!
Hi Rich,
  I couldn't find a datasheet for the WD BR1951 only a BR1941 part. I
checked what I have and I have a number of SMC COM8116 baud rate
generators which appear to be pin compatible with the BR1941 parts
except they only require a 5v supply.  Here is a link to the data sheet
found on the web.


You can let me know if they will work in your application and I can get
a few to you.


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