[Coco] Max baud rate for 68681 in MM/1?

[Kip Koon]

Hi Joel,
This is a link for the MC68681 datasheet.  
< http://pdf1.alldatasheet.com/datasheet-pdf/view/4164/MOTOROLA/MC68681.html>
The maximum speed is 1Mbps.  That should have been a lower case 'b'.  

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon


> -----Original Message-----
> From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Joel Ewy
> Sent: Sunday, January 31, 2016 4:34 PM
> To: coco at maltedmedia.com
> Subject: [Coco] Max baud rate for 68681 in MM/1?
> 
> I read ambiguous information about the 68681 on the MM/1's I/O board.
> Does anybody have a definitive word?  Page 2-5 of the MM/1 technical manual claims that it can be run at "1 megabytes per second"
> (seriously 8M bits/sec?), but the table on page 9-2 and the text on 9-2 state that the maximum baud rate is 34,800.  Is this a pragmatic
> maximum based on the CPU's ability to service the DUART's on-chip buffers without interrupt-masking trickery, is it the real hard
> maximum for the 68681, or is it a hard maximum imposed by the MM/1's hardware?  Anybody have any insight?
> 
> JCE
> 
> 
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