
5/12/86
Rob Horning

I finished the design changes to the Math board and tested them.  I have
made most of the changes to the schematic.  The PC layout is almost done.
It should go to digitize early this week.

I took a closer look at the SRAM arrays.  In general the signals look good.
The ringing never gets above about .5 volts and the signals have about the
right fall times.  The one problem that I found is that some of the pins on
Toshiba RAM's have an input capacitance as high as 10 pF (the spec is 5 pF).
They are working to correct this problem.  We are also going to mix up the
address lines on the array to even out the capacitance.

I met with IDT last week and they plan to have a 25 ns 2k x 8 part this fall.
They are projecting a price of about $10 for early next year.  I told them
that there was a good chance that we would still be qualifying parts at
that time.  Toshiba is now saying that they will not have parts until August.

We decided to build 17 more 8 Mbyte RAM boards.  I ordered 1225 more 1 Mbit
DRAM's from Toshiba.  They will take from 4 to 6 weeks.  I will get my first
RAM's in 2 or 3 weeks.

We ran out of SRAM's and would not have been able to build the eleventh
CPU board.  Cypress sent us 88 parts Federal express and so we should be
ok until bulk of the parts arrive in the next couple of weeks.

We turned on an Indigo 5 Mbyte array board in Firefox.  It seems to work ok.
We could only get UNIX to run when we told it there was 7 Mbytes.  It seems
like a software problem and so we sent it to California.

I gave Richard a list of about 20 pins that he could change to power pins
on the Math board without causing problems.

