20 Dec
2007
20 Dec
'07
4:57 a.m.
Does anyone know what a speedgrade an amd9016e DRAM chip is ?
Google gives one million resellers and no datasheets.
Suggestions as to why replacing said am9016epc with a mcm4116bp20 does not work,
are also welcome.
Jos
20 Dec
20 Dec
3:47 p.m.
Jos Dreesen / Marian Capel wrote:
Does anyone know what a speedgrade an amd9016e DRAM chip is ?
Google gives one million resellers and no datasheets.
Suggestions as to why replacing said am9016epc with a mcm4116bp20 does not work,
are also welcome.
It doesn't resolve your question, but IC Master (1982) lists the following max
Access Times:
AMD 9016D: 160ns
AMD 9016E: 200ns
MCM4116B-20: 200ns
AMD 9016D: 250ns
AMD 9016C: 300ns
(Yes, the D is listed twice, perhaps 160 should to be F (?))
4:23 p.m.
Jos Dreesen / Marian Capel wrote:
Suggestions as to why replacing said am9016epc with a
mcm4116bp20 does not work,
are also welcome.
Should have mentioned this previously, but are all the power supplies there?
The info I have says the MCM4116BP20 requires +5,?5,+12. It isn't clear as
to what the 9016 requires but there are other 16K*1 DRAMs listed as requiring
only +5.
21 Dec
21 Dec
3:46 a.m.
New subject: AMD9016E speed / lilith memory
Brent Hilpert wrote:
Jos Dreesen / Marian Capel wrote:
It is a three power device, all voltages are there. The IC is part of the Lilith memory,
which are 4 pcb's with 32 x amd9016 devices each. 16 bit wide for r/w, 64 bits wide
for instruction fetch and video output.
The machine functions, but the defective IC shows up as a white stripe on the display
since it is part of the video frame buffer. Changing the IC did not help, of course also
the 4116 replacement I used could have been defective.
The graphic board is OK, since (WARNING : board swap !) using another memoryboard solves
the problem.
I ordered some exact replacements and will continue when they arrive.
Jos
Suggestions as to why replacing said am9016epc
with a mcm4116bp20 does not work,
are also welcome.
Should have mentioned this previously, but are all the power supplies there?
The info I have says the MCM4116BP20 requires +5,?5,+12. It isn't clear as
to what the 9016 requires but there are other 16K*1 DRAMs listed as requiring
only +5.
4:29 a.m.
New subject: AMD9016E speed / lilith memory
Jos Dreesen / Marian Capel wrote:
Brent Hilpert wrote:
.. try swapping two 9016 chips on the one memory board to see if
the problem moves with the chip? (or are the chips soldered in?)
Jos Dreesen / Marian Capel wrote:
It is a three power device, all voltages are there. The IC is part of the Lilith memory,
which are 4 pcb's with 32 x amd9016 devices each. 16 bit wide for r/w, 64 bits wide
for instruction fetch and video output.
The machine functions, but the defective IC shows up as a white stripe on the display
since it is part of the video frame buffer. Changing the IC did not help, of course also
the 4116 replacement I used could have been defective.
The graphic board is OK, since (WARNING : board swap !) using another memoryboard solves
the problem.
I ordered some exact replacements and will continue when they arrive. Suggestions as to why replacing said am9016epc
with a mcm4116bp20 does not work,
are also welcome.
Should have mentioned this previously, but are all the power supplies there?
The info I have says the MCM4116BP20 requires +5,?5,+12. It isn't clear as
to what the 9016 requires but there are other 16K*1 DRAMs listed as requiring
only +5.
4:41 a.m.
New subject: AMD9016E speed / lilith memory
On Fri, 21 Dec 2007, Jos Dreesen / Marian Capel wrote:
The machine functions, but the defective IC shows up
as a white stripe on the
display since it is part of the video frame buffer. Changing the IC did not
help, of course also the 4116 replacement I used could have been defective.
What about a broken copper trace, defective data or address buffer/driver
or mux/demux? I had a similar fault on the graphics adapter in the IBM
5110, one bit of a multiplexer was bad.
Christian
23 Dec
23 Dec
12:08 p.m.
New subject: AMD9016E speed / lilith memory
From: cc at corti-net.de
On Fri, 21 Dec 2007, Jos Dreesen / Marian Capel wrote:
Hi
It could also be a problem in the address decoder. I've also seen
interaction with another RAM on the same line as causing such
problems as well.
In the case of another RAM, it is ususally the previous RAM
accessed. It tends to stay selected a little longer than it should.
My bet is on the address decoder not selecting that RAM.
Dwight
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The machine functions, but the defective IC shows
up as a white stripe on the
display since it is part of the video frame buffer. Changing the IC did not
help, of course also the 4116 replacement I used could have been defective.
What about a broken copper trace, defective data or address buffer/driver
or mux/demux? I had a similar fault on the graphics adapter in the IBM
5110, one bit of a multiplexer was bad.
Christian 
21 Dec
21 Dec
6:58 p.m.
New subject: AMD9016E speed / lilith memory
It is a three power device, all voltages are there.
The IC is part of th=
e Lilith memory, which are 4 pcb's with 32 x amd9016 devices each. 16 bit=
wide for r/w, 64 bits wide for instruction fetch and video output.
Very like a PERQ, then...
The machine functions, but the defective IC shows up
as a white stripe on=
the display since it is part of the video frame buffer. Changing the IC =
Can the processor correctly read and write that location, or does it show
errors?
did not help, of course also the 4116 replacement I
used could have been =
defective.=20
The graphic board is OK, since (WARNING : board swap !) using another mem=
oryboard solves the problem.
I wonder if the IC is fine ,and the problem is actually a data buffer
to/from that IC. I asusme you have a logic probe. If so, are you seeing
traisntion o nthe data in (pin 2) and data out (pin 14) pins ofthat chip?
those pins may or may not be connected together externally, my first
guess is that they are not.
-tony
6057
days inactive
6060
days old
8 comments
5 participants
participants (5)
-
ard＠p850ug1.demon.co.uk -
cc＠corti-net.de -
dkelvey＠hotmail.com -
hilpert＠cs.ubc.ca -
jos.mar＠bluewin.ch