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. 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. 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. 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 the time so I used it anyway, but I also bought into the 20-pin part, since that was still available. I've come to regret that, however. It didn't matter, since management killed the project, but that was the last time I bought any of the MOT MCU's. My experience has been that they don't tell the truth about supply, and they won't support you at volumes under 100K parts per week. They use distributors who won't supply you at levels like 200 per week, either, so most of my clients are screwed with MOT parts. Consequently, I haven't used, or even considered, a MOT part of any sort since '94. Dick ----- 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 ? parts $60.

see below, plz. Dick ----- Original Message ----- From: "Tom Uban" &lt;uban(a)ubanproductions.com&gt; To: &lt;classiccmp(a)classiccmp.org&gt; Sent: Tuesday, January 22, 2002 8:59 AM Subject: Re: windowed MC68HSR705J1ACS ? not 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. trying die. programmer 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. the <snip> these electronics. show