roger@banzai.UUCP (Roger Florkowski) (04/24/89)
Ok netlanders, here is a picture describing something unique about my 3b1. There I was installing a new motherboard, and I noticed something about the back metal plane that I hadn't seen on any other 3b1 I had taken apart. The back plane was extended across on the right hand side (underneath the floppy drive), and it contained a large cut out. Normally the back plane drops down as I show on the left side. Now, this cut out cannot be seen when the cover is on because the fan grate covers it. Has anyone else seen anything like this? The machine has a 67 meg drive and a high serial number. Under the cover there is writing dated April 1986, so that puts it towards the end of the production run of these machines. A funny coincidence is that I was planning on adding a second hard drive this summer. All that I have to do for cabling is cut away the fan grate and drop in a socket! phone parallel serial UNKNOWN screw jacks port port screw CUTOUT!! |-------------------------------------------------------- ________________| o [_][_][_] [____________] [_______] o [__________] | | | -------------------------------------------------------------------------- | Expansion #1 | Expansion #2 | Expansion #3 | | | | | -------------------------------------------------------------------------- -- Roger Florkowski {uunet!uvm-gen, attmail}!banzai!roger The People's Computer Company `Revolutionary Programming'
thad@cup.portal.com (Thad P Floryan) (04/26/89)
In re: Roger Florkowski's comments about a cutout in his 3B1 ... Mine has the same thing. It is EXACTLY the correct size for a 50-pin Centronics SCSI connector! :-) Even has the slots for the two screws. Since the 3B1 doesn't have a fan in that location, it would seem that the International cover would be the thing to get. In fact, looking at the drawing of the back of the International section of the UNIXPC Reference Manual, there is a metal plate there with two screws fastening the plate to hide the cutout. The cutout is immediately to the right of the TTY000 RS-232-C port connector and the rightmost (of the two rear plastic cover screws) fastens right smack dab between the RS-232 and the "other" cutouts. That cutout is just NOT documented. But it's there. A perfect location for a SCSI connector. Now, just to locate "International" covers. :-) If anyone (in N.Calif) wants to bring their 3b1 to the May meeting of the Bay Area AT&T Computers Users' Group, we can open it up. I intend replacing the clock battery in one member's 7300 with a socket and replacement battery right there in the meeting (takes about 20 minutes), so we can open up UNIXPCs "just to see what's there" while I talk about uucp and the UNIXPC. Thad Floryan [thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad]