Re: keycaps / switches for Tek 4006
After a little more research on the net tonight: it looks like the keyboard in the 4006 was pretty much one of Cherry's standard "B70 ASR" models. The key mechs are known as M7 T-mount, and the caps look like the standard double shot ones supplied by Cherry in their mid to late 70's catalogs. A lot of the Tek terminals I've seen for sale seem to be missing a few teeth; I guess these caps didn't hold on well enough to weather the decades without a few from most keyboards getting lost along the way. It's probably worth working up some 3D models for these caps. Also, keyboard research turns up some sad, sad, things... B... :-( --FritzM.
Re: Resurrecting integrated circuits by cooking them.
On Wed, 2019-07-24 at 21:24 -0400, Pete Rittwage wrote: I did some lookup on the reflow temperatures for various solder materials because my gut told me 250 degrees is too low to do any good. Turns out this is so. 250 CELCIUS maybe, but Fahrenheit? not. https://www.google.com/search?q=melting+point+of+solder&tbm=isch&source=iu&ictx=1&fir=lNlL1odJeOshrM%253A%252Cdl2_5Te6VgKpAM%252C_&vet=1&usg=AI4_-kRutgIaitoyNNmWoI_dbqyF1P0xmQ&sa=X&ved=2ahUKEwi17--3_NXjAhUK2FkKHZhiCaIQ9QEwAHoECAEQAw#imgrc=lNlL1odJeOshrM : Here's a link to that information. It looks like 220 Celciums is about right. So if you were in Fahrenheit then that would explain the total failure of the experiment and make it worth retrying. RSVP YHOSvt. ** TNM ** > > > I tried this a year or two back with about 30 x SID, VIC, and PLA > chips > out of C64's. I heated them in the oven at about 250 for 15 minutes. > None of them showed any more signs of life than before I tried it, > unfortunately. >
Re: IBM 5160 with oddball MDA input/output card
On 7/26/2019 12:47 PM, Jules Richardson via cctalk wrote: > > That's an interesting beast. I did wonder if this was something along > those lines, too, i.e. a non-x86 processor card for the purposes of > emulating something else - but the only one I'm aware of is the XT/370, > and I don't believe that did any kind of video pass-through (that and I > think it was a three-board set, where this is two at most). > The XT/370 proper was a two board set: a processor card (P-Card) and a memory card (M-Card). The XT/370 also came with a 3270 coax terminal emulation card, which might be the card you are thinking of. (And no, the XT/370 did not have anything special, video-wise). The 3270/PC had a special setup where the keyboard connected to a special connector, which connected to a special keyboard card, and also to the normal PC keyboard connector -- but nothing like what you are describing (it was only a DB9 or 15). JRJ
