
5/19/86
Rob Horning

I updated my Math board schematic to match the new PC layout.  I also added
HP part numbers so that I can use Russes' program to check the material 
list.  I also updated the parts placement fro the design rule checker.

The Math board is layed out and they are almost done digitizing it.  I
should get tapes to check today.

I talked to the CA chip designers this week to get updated and to get some
information.  Of the the 3 chips that they have, only one does DMA.  It is
likely that ours is a bad chip.  They could check ours out, but we want to
keep it because we are using it in RFI testing.  They said that I should
not ground the heat sink because in the future they may connect it to
-2 volts.

We tested the AP card and everything seemed to work.  We used FP clock
and FP data to talk to it.  We could disable it with the key.  We reset the
machine with the terminal.  We could turn on the yellow LED when remote
was enabled.

I have started to look at the RTC crystal.  One thing that I discovered is
that the frequency changes about 12 ppm when the voltage is changed from
5 volts to 2.5 volts.  We will have to make sure that it is calibrated with
2.5 volts applied.

I got 6 RAM's from Stantel.  They are supposed to be 30 ns parts.  I gave
some to Brian Sharpe to test.  He still does not have his test working.

I wrote up a list of things that are changing on the Math board for Arnold.
He is keeping track of things that change with each rev.

