22 Jan
2002
22 Jan
'02
10:28 a.m.
see below, plz.
Dick
----- Original Message -----
From: "Tom Uban" <uban(a)ubanproductions.com>
To: <classiccmp(a)classiccmp.org>
Sent: Tuesday, January 22, 2002 8:59 AM
Subject: Re: windowed MC68HSR705J1ACS ?
I'd recommend you build an adapter that uses a currently available part and
uses a currently available programmer. I think you're out of luck, or at
least looking at a hard time, both with getting the windowed J1A, and with
making the K1 programmer work with the J1A. Keep in mind that the programmers
that MOT sold were quite different, and both were firmware based, using an OTP
J1A on the board.
the
<snip>
these
At 08:26 AM 1/22/02 -0700, you wrote:
>These parts have been discontinued by Motorola for about 5 years, so I'm
not
surprised
you're having difficulty finding them. That "SR" in the part
number
disturbs me somewhat as well, as it's not on
any of the windowed parts I
have,
and I don't think they made two 20-pin
windowed parts. I'm also not sure
what
the MC68HC701J1A has to do with any of this. The
'701 is a much older part
that never came in a 20-pin version, and, I don't think ever came in an 'HC
version either.
Oops, my mistake. I said 705 in both the subject and all but one place in
my message. I did not mean to type 701...
Perhaps the nomenclature is screwing up your
search. I'm not sure what the
correct part number for the ceramic windowed package is, but I'm not at all
sure that MC68HC705J1ACS is it. I could go look, I suppose, but it's an
easter-egg hunt, so it might take some time. If you find the right
parts-search engine, it will turn up a supply of these parts, but not at
"cheap" prices. I found 'em a couple of weeks back, after getting a spam
from
a "new" parts-search site. I have them
look for Z84C0020 and MC68HC705J1A
just to see what they turn up, and I was surprised to find that they had
pointers to supply of both, not that I want to buy either.
I am only using the ACS suffix for the windowed part as that is what the
motorola web page says for ordering information:
http://e-www.motorola.com/brdata/PDFDB/docs/MC68HC705J1A.pdf
It may be that the AS or AVS is correct as well. All that I care is that
it is a 68HC705J1A in a ceramic DIP windowed 20-pin package.
>If you're really determined to use the 20-pin part, there are a couple of
>current 'HC805 and 'HC908 parts that might work for you. Mot has been
trying
>quite actively to kill off the 'HC05 series,
but it seemingly refuses to
die.
My project is to re-program an existing board which uses the 'HC705J1A, but
if I have to, I can switch to a similar and available part. I don't plan on
making a product with the part, so availability is not a big deal. I just
want to change the program in an existing board. I have a 'HC705K1
programmer
which I am hoping will program the 'HC705J1A part.
The only difference seems
to be the number of I/O pins.
The one thing on which I'm quite certain you can rely is that the 'K1
programmer won't deal with the J1A. If the 'K1 programmer would have done the
job, I'd not have bought the J1A programmer/emulator. It should be quite
obvious, however, since the K1 is a 16-pin part and the J1A is a 20-pin part.
While the voltages may possibly be the same, though I doubt it, (there was
also a different programmer/emulator for the K1A) the pins to which they've
got to be applied are not. The size of the program store is also different.
Since the software that does the dirty work comes from a third-party through
MOTOROLA, and since they get paid for making DIFFERENT devices, I'd not rely
on any similarities, particularly in the [rpgramming software.
I remember the MOT guys discouraging me from using
the 'HC705K1 (16 pins)
back
>in '94. They didn't have a 16-pin replacement from the 'HC805 series at
Dick
--tom
>----- Original Message -----
>From: "Tom Uban" <uban(a)ubanproductions.com>
>To: <classiccmp(a)classiccmp.org>
>Sent: Monday, January 21, 2002 10:59 PM
>Subject: Re: windowed MC68HSR705J1ACS ?
>
>
>> I'm after the 20-pin DIP ceramic windowed part vs. the OTP part. The part
>> number that I indicated (MC68HC705J1ACS) should be the one which matches
>> what I am looking for. No one seems to have them, including the places
>> that you reference, at *any* price.
>>
>> --tom
>>
>> At 09:10 PM 1/21/02 -0700, you wrote:
>> >I'm not at all convinced I know what you're after. The 20-pin
68HC705
>parts
>> >with which I'm familiar are the MC68HC705J1A which comes in a number of
>> >packages, one of which is the ceraminc windowed part. I don't think
>> are
>> >unavailable in distribution, though I've never gotten one for less than
>$60.
>> >I think the last place I saw them for sale was Future-Active
electronics.
>> >www.future-active.com, though things
change, and a quick look didn't
show
that
part. ISTR that DigiKey had the windowed parts
too at one time.
Dick
----- Original Message -----
From: "Tom Uban" <uban(a)ubanproductions.com>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, January 21, 2002 7:11 PM
Subject: windowed MC68HSR705J1ACS ?
> I am looking for a source for a MC68HSR705J1ACS Motorola 20 pin DIP
> with window (erasable) MC68HC701J1A microprocessor. I have only been
> able to find the OTP versions, but would like to find an erasable
> one for development. Does anyone know of a source, or have one (or 2)
> that you would be willing to sell me?
>
> --tnx
> --tom
>
>