3 Sep
2012
3 Sep
'12
6:37 a.m.
Does anyone know if Motorola ever made 6809s that could function
either as 6809 or 6809E depending on some external signal, or perhaps
depending on how they were bonded out?
The reason I ask is that I've been playing with an SBC designed around
a 6809E. While working on writing the monitor on the first prototype,
it died with what looked like a bad CPU. So I ordered a replacement,
and while I was at it, ordered the parts to populate another board.
Both the board with the replacement CPU and the other freshly
populated board behaved the same way. After a little digging it
appeared that the E and Q clock signals that should be externally
driven for a 6809E were being driven by the CPU like for a 6809. I
took a chance and rewired it like a 6809 and sure enough it's working
now. But after numerous double checks, the chips definitely say
MC68B09E/00TA6/HEQB0014. Has anyone seen anything like this? Did I
end up getting a couple of chips that were mismarked? Is there a way
to make them behave as 6809Es?
Thanks in advance,
BLS
3 Sep
3 Sep
8:42 a.m.
On 09/02/2012 10:37 PM, blstuart at bellsouth.net wrote:
Does anyone know if Motorola ever made 6809s that
could function
either as 6809 or 6809E depending on some external signal, or perhaps
depending on how they were bonded out?
I don't think so. They used different mask sets for the 6809 and
6809E. Possibly only the metal mask differed, but I haven't verified that.
For the 6809, I've seen masks P6F, T5A, CW3, and C65P.
For the 6809E, I've seen masks T6R and EN6, but I'm pretty sure there is
one earlier and one later one.
The one oddball I've seen was marked MC6809ELDS, with an MB2 mask and
8417 date code. I've never found out what the deal is with the "LDS"
suffix, or the oddball mask code.
But after numerous double checks, the chips definitely
say
MC68B09E/00TA6/HEQB0014. [...] Did I
end up getting a couple of chips that were mismarked?
Seems likely that it's mismarked. Is the part in a plastic DIP?
Normally all "E" parts would have a second letter for the package, so
it's possible that this was a non-E part where the mismarking error was
to use "E" as a package code instead of "P" or "L".
On the other hand, I haven't seen a TA6 mask code before. Based on the
date codes, it could be that the TA6 mask set for the "E" part might
correspond to the C65P mask set for the non-"E".
Is there a way to make them behave as 6809Es?
Doubtful.
Eric
7:08 p.m.
For the 6809, I've seen masks P6F, T5A, CW3, and
C65P.
For the 6809E, I've seen masks T6R and EN6, but I'm pretty sure there is
one earlier and one later one.
...
Seems likely that it's mismarked. Is the part in a plastic DIP?
Normally all "E" parts would have a second letter for the package, so
it's possible that this was a non-E part where the mismarking error was
to use "E" as a package code instead of "P" or "L".
On the other hand, I haven't seen a TA6 mask code before. Based on the
date codes, it could be that the TA6 mask set for the "E" part might
correspond to the C65P mask set for the non-"E".
I figured mismarking was the most like scenario. But just to make
things even a little more confusing, the 68B09E that I had been using
before it gave up the ghost, and that was quite happy with externally
generated E and Q, has a mask code of C65P. It's date code is
QETD0148. All 3 are plastic and none have a suffix beyond the E.
The good news is that the only reason I had designed the boards to use
the E parts was that they were easier to get. So pulling the 74LS76
and adding a few patch wires is easy enough to get them working. It
makes me think if I do another turn of the board, I should add some
jumpers to let one use either.
BLS
4 Sep
4 Sep
9:12 a.m.
I wrote:
The one oddball I've seen was marked MC6809ELDS,
with an MB2 mask and
8417 date code. I've never found out what the deal is with the "LDS"
suffix, or the oddball mask code.
Checking an older datasheet reveals that in this case "L" is the usual
ceramic package designation, "D" is level 2 reliability screening, which
is a 168 hour burn-in at 125C, and "S" is level 1 screening, which is 10
temp cycles from -25C to 150C, and a high-temp test at max Tamb. "D"
and "S" may be used separately, or combined. The "S" in this position
is should not be confused with an "S" package code, which is Cerdip.
Someone sent me a link to a photo of a plastic "DS" suffix part.
It's still odd that this particular part had an MB2 mask with 8417
datecode. I haven't ever seen the MB2 mask on another 6809E, and
Motorola was using the EN6 mask from at least 8232 through 8633, so it
is strange that they would have made the same part with a different mask
set in the middle of that date range.
Eric
3 Sep
3 Sep
2:56 p.m.
On 09/03/2012 12:37 AM, blstuart at bellsouth.net wrote:
Does anyone know if Motorola ever made 6809s that
could function
either as 6809 or 6809E depending on some external signal, or perhaps
depending on how they were bonded out?
The reason I ask is that I've been playing with an SBC designed around
a 6809E. While working on writing the monitor on the first prototype,
it died with what looked like a bad CPU. So I ordered a replacement,
and while I was at it, ordered the parts to populate another board.
Both the board with the replacement CPU and the other freshly
populated board behaved the same way. After a little digging it
appeared that the E and Q clock signals that should be externally
driven for a 6809E were being driven by the CPU like for a 6809. I
took a chance and rewired it like a 6809 and sure enough it's working
now. But after numerous double checks, the chips definitely say
MC68B09E/00TA6/HEQB0014. Has anyone seen anything like this? Did I
end up getting a couple of chips that were mismarked? Is there a way
to make them behave as 6809Es?
Thanks in advance,
BLS
In a word, NO.
Most cases the solution is either the right part of supply the clock
externally
and create the E signal.
Allison
4613
days inactive
4614
days old
4 comments
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participants (3)
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ajp166＠verizon.net -
blstuart＠bellsouth.net -
eric＠brouhaha.com