Stuffing boards with pulled QFP chips

I'm down to the last few P112 boards for sale and am pondering another run of them because demand is steady. One of the biggest challenges for the last run was getting the QFP-packaged 100-pin chips[1] in a state such that the pick-and-place robot wouldn't throw a fit about slight

Re: Cross-talk square-wave?

> Don't trust ANYTHING! Recent Xilinx FPGAs have permanent "weak > keepers" on all pins, they can not be turned off. > What this is is a non-inverting receiver on the pad, that is driving > back to the pad with about a 50K Ohm resistor. > Plays hob with analog stuff like crystal oscillators.

Re: Cross-talk square-wave?

> From: Brent Hilpert > I don't have a full enough picture of the circuit and circumstances to > provide a definitive suggestion but, some principles: > ... > It's not clear C-coupling is what's going on here (the wave shape looks > pretty sharp for what I understand of

WTB: DEC VR241 or HP 6000 670H (or 670XP)

I'm looking for two items: A VR241 to use with my DEC 380 as a colour head (even better if you have the cable and a spare LK201, since I'm down to my last working keyboard). The VR201 isn't cutting it anymore and I don't think I can use my VR260 with this. An HP 6000 670H hard disk (the big one

Re: Trip to CHM - Hotel/Restaurant Advice

On 3/30/17 9:29 PM, Chuck Guzis via cctalk wrote: > In the late 70s, on Evelyn in Sunnyvale, near Wolfe, I believe. That would be the original Halted location, Evelyn and Wolfe Halted moved to roughly laurence and central, then moved to 3051 Corvin last year. The previous building was

OT: PCI Ethernet or USB 2.0 ethernet?

Friends, I have an instrument that has an intel motherboard with 400 MHz FSB PCI (not PCI-e). It has a 100 mbps Ethernet card and it would be very useful to get faster networking. The chassis of this instrument is such that I cannot fit a traditional PCI 1GB Ethernet card (I've tried). So I

Re: Trip to CHM - Hotel/Restaurant Advice

On 03/31/2017 11:17 AM, Al Kossow via cctalk wrote: > > > On 3/30/17 9:29 PM, Chuck Guzis via cctalk wrote: > >> In the late 70s, on Evelyn in Sunnyvale, near Wolfe, I believe. > > That would be the original Halted location, Evelyn and Wolfe > > Halted moved to roughly laurence and central,

Intellivision reset switch

Can anyone who's been inside an Intellivision confirm that there's supposed to be a little foam disc beneath the reset switch plate? I picked a system with a box of cartridges up earlier, half expecting the machine to be dead (I was figuring it was going to be a blob of

Re: Cross-talk square-wave?

On Thu, Mar 30, 2017 at 07:41:25PM -0400, allison via cctalk wrote: > *Vonada's Engineering Maxims* are a group of pithy observations about > computer engineering There's too much hard-learned truth in all that, to be funny. mcl

Re: Trip to CHM - Hotel/Restaurant Advice

On Thu, Mar 30, 2017 at 5:05 PM, Rich Alderson via cctalk < cctalk@classiccmp.org> wrote: > and what there are are not > easily within walking distance of good food (In 'n' Out does not qualify). > Them's fightin' words!

Re: Trip to CHM - Hotel/Restaurant Advice

> Remember Haltek in Mountain View? (wasn't it at the dead end of Linda > Vista? I bought my Tek 465 there.) You don't mean Halted Electronics, do you? That should still be around. I was passing through Sunnyvale on my way back south and picked up some useful doodads at Weird Stuff, though it

RE: Trip to CHM - Hotel/Restaurant Advice

I thought the Vintage Computer festival west link might have recommended hotels but I couldn't find anything for you. I did a similar trip but needed to be quite a few hours south for my actual destination. I didn't find a very cheap hotel either, and the under $100 one I did find near long

Re: Apple 1, Commodore 65, Enigma Machine, Inventor of C++

Original message From: Christian Corti via cctalk Date: 3/29/17 3:29 AM (GMT-06:00) To: Evan Koblentz >On Tue, 28 Mar 2017, Evan Koblentz wrote: >> "What do an Apple 1, Commodore 65, >>Enigma Machine, and the inventor of C++ >> all

Re: Stuffing boards with pulled QFP chips

On 03/31/2017 06:32 AM, David Griffith via cctalk wrote: I'm down to the last few P112 boards for sale and am pondering another run of them because demand is steady. One of the biggest challenges for the last run was getting the QFP-packaged 100-pin chips[1] in a state such that the

Re: Cross-talk square-wave?

On 03/31/2017 07:10 AM, David Bridgham via cctalk wrote: Don't trust ANYTHING! Recent Xilinx FPGAs have permanent "weak keepers" on all pins, they can not be turned off. What this is is a non-inverting receiver on the pad, that is driving back to the pad with about a 50K Ohm resistor. Plays hob