Interesting Motorola 68K-like IC?

[mario]

Dear all,


I acquired recently a board that looks like an S-100 card, except it has 80
connectors instead of 100, and was made by tandy.

So, this board has, among other things, an IC that looks a lot like
theMotorola 68000 (64 CERDIP, 900 mils wide) and in fact, it sports the
Motorola logo, but this is what is written on it:

8040000
SC88019L
GN78302

I also got another board which appears to be some kind of memory card, but
again, the RAM ICs are some really strange beast: 16 pin CERDIP parts from
Motorola, with the following text:

8040665
BQD8346 (this number varies, as well as the first letter can be an "A")

These are intermingled with similar-looking ICs which however have the text:

MCM6665AL20
FQD8416 (this number varies)


I don't know what kind of bus do these cards plug into. Maybe a TRS-80?


many thanks in advance for any hint!


mario

 

[Franc Zabkar]

On Thu, 02 Sep 2004 17:54:46 GMT, "mario"
<gianmarioRE.scottiMO@nokiaVE.com> put finger to keyboard and
composed:

Dear all,


I acquired recently a board that looks like an S-100 card, except it has 80
connectors instead of 100, and was made by tandy.

So, this board has, among other things, an IC that looks a lot like
theMotorola 68000 (64 CERDIP, 900 mils wide) and in fact, it sports the
Motorola logo, but this is what is written on it:

8040000
SC88019L
GN78302

I also got another board which appears to be some kind of memory card, but
again, the RAM ICs are some really strange beast: 16 pin CERDIP parts from
Motorola, with the following text:

8040665

This site ...

http://www.vintagefunworld.com/items.asp?ID=14

.... claims this part is equivalent to a standard 4164 DRAM.

BQD8346 (this number varies, as well as the first letter can be an "A")

These are intermingled with similar-looking ICs which however have the text:

MCM6665AL20

My Motorola Master Selection Guide (1984) lists this as a 65Kx1,
200nsec DRAM, probably equivalent to a 4164. Yes, it does say "65K",
but I guess that's a typo.

FQD8416 (this number varies)

That's a YYWW date code.

I don't know what kind of bus do these cards plug into. Maybe a TRS-80?

"8040665" appears to be a Tandy part number. I suspect 8040000 is
also.

At least one web site states that the 8040665 was a "TANDY Original
Dynamic Ram Memory IC used in the earlier Tandy TRS-80 and Color
Computers (CoCo)".


- Franc Zabkar
--
Please remove one 's' from my address when replying by email.

 

[Michael Black]

"mario" (gianmarioRE.scottiMO@nokiaVE.com) writes:

Dear Franc,


read answers below:

"Franc Zabkar" <fzabkar@optussnet.com.au> wrote in message
news:ru0fj09cgh65vce496r81bkvetapbbn2k1@4ax.com...

8040665

This site ...

http://www.vintagefunworld.com/items.asp?ID=14

... claims this part is equivalent to a standard 4164 DRAM.
Yes, so it seems. I guess it would help if I coud find a really good Tandy
website/resource.

BQD8346 (this number varies, as well as the first letter can be an "A")

These are intermingled with similar-looking ICs which however have the
text:

MCM6665AL20

My Motorola Master Selection Guide (1984) lists this as a 65Kx1,
200nsec DRAM, probably equivalent to a 4164. Yes, it does say "65K",
but I guess that's a typo.
It should be equivalent to a 4164. The two ICs were randomly "mixed"
together, serving apparently identical functions. The reason I listed them
both is, I was hoping someone would recognize at least one of them. Tactic
which apparently worked.


FQD8416 (this number varies)

That's a YYWW date code.
I knew that, I just wanted to specify it for completeness (avoid questions
like "are you sure you didn't just copy the date of production?").

I don't know what kind of bus do these cards plug into. Maybe a TRS-80?

"8040665" appears to be a Tandy part number. I suspect 8040000 is
also.
I am more inclined now than before reading your post, to think the 8040000
is a Moto 68K, under another name.

Now, it remains to be seen which TRS computer was so advanced to accept such
a CPU.


If it's really a Tandy board, given the date codes it likely is a 68000.

(My first thought was that it wsa Motorola's first attempt at something
better than the 68000, which was the 88000 series, but that came later.)

Radio Shack had a couple of 68000 based computers in the early eighties.
They weren't intended for the home user, too expensive, but they did
run Xenix, a Unix variant. One model was like a retrofit on one of the Z-80
based models, while the other was a standalone.

Ask in comp.sys.tandy

Michael

 

[mario]

"Michael Black" <et472@FreeNet.Carleton.CA> wrote in message
news:ch8afj$b67$1@freenet9.carleton.ca...

Radio Shack had a couple of 68000 based computers in the early eighties.
They weren't intended for the home user, too expensive, but they did
run Xenix, a Unix variant. One model was like a retrofit on one of the
Z-80
based models, while the other was a standalone.
I think you are talking about the Model 16 and 6000.

I would really like it if I could find a place that documents the bus into
which these cards plugged in, as well as the cards.

Ask in comp.sys.tandy
I will. I hope it's still "alive".

Thank you, Michael, for confirming the IC model.