Well, it seems very odd that with the same rev1-6X motherboard that MITS would use two different IC's. I checked your pics of the motherboard and its the same...
Guys, I have plenty of 'plain' TTL 74123 IC's. Let me know, and I'll send you some. Just plug it into the socket (presuming it is socketed): Most likely, it...
I just got off the phone with Dan Yee of the University of Wisconsin Medical Electronics Lab. Shhhh! They are selling off their old chips, parts, etc. They...
Dan, Bob, Brian (and anyone who cares :-)) The 74L123 is listed in the schematic, I received assistance from Steve Shepard of AltairManuals.com. I have a 1-6X...
Hey man, I don't know which documentation you guys are reading, I suspected you had downloaded the 680b docs already. How can the 74LS74 can be mistaken for a...
... Bill, According to a book I have - "Basic Electronics Theory" by Delton Horn - the 74L uses a tenth of the power a standard TTL uses but gates at tenth the...
I'd prefer that we all limit sale / trade / wanted posts to items directly from ourselves, and to listings from elsewhere which are extremely noteworthy. Of...
Bill, Looking at the photo showing the missing chip, it appears that you may also be missing a few components in the O/I section. (or is that I/O? :-) ) I...
Bill, I have the TI TTL data book from that era which lists both L123 and LS123 one-shots. The timing formulas are a little different, but the parts are very...
No, spews says it's not listed. Besides, I did try from my work address as well. Can't get email to you either way. Besides, most blacklists immediately...
Bob, We greylist/blacklist here, your IP address is in spews.org as a spammer. You should check this out. If the problem persists, we can whitelist you to...
... Modifications needed... "Our second edition of that hobbyist convention (and the fourth VCF East event overall) will be held Saturday, June 9th, 2007 and...
I might, but won't know until I get home around 8 PM. Does it need to be an "L" part or would an LS work? BTW, I can't seem to email you directly... it bounces...
http://stores.ebay.com/MD9-Enterprises_Vintage-Computer-Apple_W0QQcolZ4QQdirZ1QQfsubZ8007313QQftidZ1QQtZkm Not mine or anything. Just thought I'd share....
I am learning a lot about the Altair 680. It appears that the memory is OK, but as you can see from the latest pictures... ...
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midatlanticretro@yaho...
Mar 1, 2007 8:11 pm
MARCH frequently asked questions -- last updated 3/30/2006 1. What is MARCH? MARCH is a user group for people who enjoy using antique/vintage computers. Our ...
Andy joined me today at InfoAge. We had a few visitors who seemed genuinely interested in what we're all about. We tinkered with the Altair, Kaypro II, a...
I will keep your email. I don't need it quite yet, unless you're giving it away because otherwise you'd be throwing it away. I have a number of other systems...
No, the MAU is for many network types, including Ethernet. See section 8.1.1 and 8.1.1.1 of IEEE 802.3. The AUI is discussed in section 7, but is basically...
Bob, Just to make sure we have our wires straight - MAUs are for TokenRing, not Ethernet. Some TokenRing cards have a D-connector that can look like an AUI...
Hi Andy, I was just going for the 'value' angle here. However, if you ever get a PI and want to trade it for a KK or a M2 - I'll be more than happy to hook you...
If you've got some connections to reasonably priced, rare Atari carts - you've got my attention! I've got over 200 carts, but none that are too rare. I just...
My friend's dad had a computer store in the early 80's and we made T-shirts to hand out as a promo. Luckily his dad had a good sense of humor [or he didn't...
