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Need baud rate generator circuit for an 8251 USART

C

Commander Dave

Jan 1, 1970
0
Hello again all,

This is really a repost of the thread "Adding Serial I/O on a vintage Z80
system", but thought being specific in the title might get me an answer. I
didn't realize that finding a schematic with parts for a serial port would
be so problematic. :p

What I need:

I have an old schematic of a complete serial port using an 8251, but the
only piece missing is the baud rate generator clocks. I have received
general information on how to make one, but I need some actual schematics
and parts list (my electronics training hasn't got to crystals and such
yet).

My baud rate requirement is modest as it will just be driving a terminal on
a 1.78 MHz Z80 type system. 9600 baud would be plenty.

I have posted the schematic that I have for the serial port to
alt.binaries.schematics.electronic, so if you would like to see what I want
to build, just check out that posting. It will be the same title as this
post.

Thank you all for your help,
-Commander Dave
 

KD5VMF

Jan 16, 2009
2
Joined
Jan 16, 2009
Messages
2
Baud rate generator.

Try this circuit.
 

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