[Coco] OT: 63B09

Louis Ciotti lciotti1 at gmail.com
Thu Oct 20 13:01:20 EDT 2011

The controller is not functioning.  It is a SCOM 5K repeater controller.
The socketed 63B09 appears to function, fine, all the other pins I get a
nice clean data signal.  The microprocessor is connected to an HD6340 via
the pins that are noisy.  My original investigation showed that these pins
were low in voltage (i.e. the data pulses were between 0 on 1.2 rather than
the expected 0 to 5).  I pulled the HD6340 and the levels when to the
expected 0 to 5, but had this extra noise on it.  I was able to obtain a
replacement for the 6340, but now I believe the noise is significant enough
to make the 6340 not function correctly.  Additionally last night while
looking at other portions of the circuit I found 3 74HCXXX ICs that had
various outputs that were not functioning at all (i.e. one of 4 OR gates in
one IC has no output even though the inputs are there).  I think there must
have been a spike somewhere that caused all of this.

On Thu, Oct 20, 2011 at 12:29 PM, <hhos at st-tel.net> wrote:

> What problem(s) are you having with the controller? Is it dead, or just a
> bit twitchy? Is the CPU socketed? If so, reseat the CPU in the socket.
> > I have a radio controller from circa late 80s that uses a 63B09 that I
> > think
> > may be bad.  What can I use in its place and is there a source?
> If it is indeed a 63B09, and not a 63B09E, then look here:
> http://www.ebay.com/itm/2pcs-IC-HD63B09P-IC-DIP-40-HD63B09-/190573696563?pt=LH_DefaultDomain_0&hash=item2c5f13d633
> Before you buy a 63B09 from Hong Kong make sure they know the difference
> between the E and plain versions of the chip. The E version requires an
> external clock. And I think it also has static internal registers. The
> plain 63B09 may have dynamic registers to save on power consumption.
> I bought some "E" version chips once that turned out not to have an E in
> the number on the chip. They worked just fine in my CoCo1, which was a
> surprise to me. They ran much cooler than my Motorola chip so that made me
> think they might be the plain version. They actually ran though, so it may
> be that they were actually E chips, just labeled incorrectly. I never
> tested them any further than that. I complained to the vendor about the
> uncertainty and they returned my money.
> If there is an E on the end of the number on your chip and you have a
> CoCo1 you can try the chip out in the CoCo. Otherwise, for a replacement,
> look here:
> http://www.ebay.com/itm/HD63B09EP-Hitachi-8-bit-Microprocessor-New-Old-Stock-/220783770322?pt=LH_DefaultDomain_0&hash=item3367bcfad2
> Or here: http://www.cloud9tech.com/
> > The problem I am seeing is RN6(Pins 24-31) has some "noise" on the line
> > and
> > the waveform is not exactly square like the rest of the data lines when
> > observed with an oscilloscope.
> Are you observing the waveform directly on the CPU data bus lines? If so,
> you may be introducing the noise you are seeing. A better place to check
> might be on a buffer chip output, if present.
> HH
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