Re: Complete Information on MM5740 Keyboard Decoder Found!

["Bill Garber" <willy46pa@comcast.net>]

"mwillegal" <mike@willegal.net> wrote in message news:262539
01.5.1329278176052.JavaMail.geo-discussion-forums@vbbbm3... 

> and if you have a keyboard with one of these encoders, 
> try this trick: 
> 
> type and hold down M, then N, then B (holding all the 
> keys down) - you'll see another character come in. 
> There are many other 3 character combinations that will 
> cause extra characters to come in.  True  N-key rollover 
> keyboards require diodes in the matrix in order to work 
> correctly.   Datanetics/Apple left them out. 
> 
> It's possible later encoders/keyboards will have similar 
> behaviors, but I'll leave that to someone else to check out. 
> 
> Regards,
> Mike W. 

Found the book on a mirror site, much easier to navigate. 

http://www.mirrorservice.org/sites/www.bitsavers.org/pdf/national/_dataBooks/1977_MOS_LSI_databook.pdf 

Bill