🚀 go-pugleaf

Can anyone email me, or point me to a datasheet for the Motorola
MC146818 Real Time Clock chip used in IBM AT type computers?

What I'm most looking for is a table of the possible values for bits 3:0
of "status register A" -- the "rate selection bits".  The documentation
I have says that the IBM BIOS initializes these bits to 0110, thus
selecting a 1024 Hz square wave.  Unfortunately, it doesn't bother to
document what the other 15 combinations mean.  If you have only a
printed datasheet, let me know if you're willing to type in that table.

I suspect there's a lookup table in the chip, and that there might be
different versions of the chip with different lookup tables.  Any
further information or warnings about that would be appreciated.

If I receive an online datasheet I will make it available to others;
send me a request now (via email).  I do not intend to post it -- the
concept of a "summary" of a datasheet doesn't seem to make much sense...

Thanks in advance!

Bela Lubkin  * *  //  filbo@deeptht.santa-cruz.ca.us    ZURC ATNAS morf EVIL!
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R Pentomino  * \X/  Filbo @ Pyrzqxgl +1 408-476-4633 and XBBS +1 408-476-4945