Re: found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

not these heads. Sent from AOL Mobile Mail On Saturday, May 12, 2018 Chuck Guzis via cctalk wrote: My guess was MADRE or NRL: https://www.wikiwand.com/en/Over-the-horizon_radar The timing would be right. Acoustic delay lines served the same purpose, but you couldn't

More ancient memory

I found this interesting article: http://pichotjm.free.fr/DisplayDL/DisplayDLus.html that discusses an ASCII video terminal from about 1970 that employs a bunch of PAL TV 64 usec. piezo delay devices as a way to reduce cost. --Chuck

Re: Restoring a PC Server 500 P/390

On 05/12/2018 05:07 PM, Dave Wade via cctalk wrote: I was so unsure of what I was doing that I haven't blogged, twittered, or even Facebooked And here I went and asked you to air dirty laundry. — I'm sorry. But I am grateful that you did so. :-) I did find it an interesting read, and

RE: Restoring a PC Server 500 P/390

> -Original Message- > From: cctalk On Behalf Of Grant Taylor via > cctalk > Sent: 12 May 2018 19:39 > To: cctalk@classiccmp.org > Subject: Re: Restoring a PC Server 500 P/390 > > On 05/12/2018 05:32 AM, Dave Wade via cctalk wrote: > > I am rebuilding a

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

And I almost bid on the 2 CEC p770's until I looked at the power consumption the way I had them configured. 768 GB RAM and I think 24 cores, I would have had to add a new circuit to the room. On Sat, May 12, 2018 at 8:46 AM, Mazzini Alessandro wrote: > 48.x KG for the rack

Re: found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

My guess was MADRE or NRL: https://www.wikiwand.com/en/Over-the-horizon_radar The timing would be right. Acoustic delay lines served the same purpose, but you couldn't have a mercury delay line in an airplane, practically speaking. --Chuck

Re: found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

vrc get pro. control hpt Sent from AOL Mobile Mail On Saturday, May 12, 2018 Chuck Guzis via cctalk wrote: Head-per-track drums were used on airborne radar setups as a non-computer use. John Meshna used to advertise military surplus ones, complete with 400Hz spindle

Re: found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

these probably get proc control vec drums Sent from AOL Mobile Mail On Saturday, May 12, 2018 Chuck Guzis via cctalk wrote: Head-per-track drums were used on airborne radar setups as a non-computer use. John Meshna used to advertise military surplus ones, complete with

Re: found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

Head-per-track drums were used on airborne radar setups as a non-computer use. John Meshna used to advertise military surplus ones, complete with 400Hz spindle motor. I was tempted at the time to get one, but was warned that the surplus ones are rarely functional. --Chuck

found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email Sent from AOL Mobile Mail On Saturday, May 12, 2018 ben via cctalk wrote: On 5/11/2018 5:11 AM, Peter Corlett via cctalk wrote: > On Thu, May 10, 2018 at

found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email

found what I believe are a few vrc drum pickup heads too bad photos don't post here interested parties,can email Sent from AOL Mobile Mail On Saturday, May 12, 2018 ben via cctalk wrote: On 5/11/2018 5:11 AM, Peter Corlett via cctalk wrote: > On Thu, May 10, 2018 at

Re: how fast were drum memories?

On 5/11/2018 5:11 AM, Peter Corlett via cctalk wrote: On Thu, May 10, 2018 at 01:53:12PM -0600, ben via cctalk wrote: [...] Can not be slower than modern computers, It takes 5 minutes for my mail program to load under windows and grab new mail. And yet computer performance was perfectly

Re: Looking for info on Motorola 4015 chip

On 2018-May-12, at 11:03 AM, Noel Chiappa via cctalk wrote: > Hey, all, the RK11-D contoller for the PDP-11 uses Motorola 4015 MSI chips on > one of the boards (M7254), but I can't find out anything about them. Google > didn't turn anything up, and the appendix in the RK11-D Maintenance Manual >

Re: Zenith Z-90 startup

Hello, I have had this issue with a number of H/Z89s I have. The terminal board and the logic board are two separate systems, so it seems to be common for the logic board to go down while the terminal board keeps working. I would check voltages on the logic board, then take it out of look for

Re: Looking for info on Motorola 4015 chip

page 242 On 5/12/18 11:37 AM, Jerry Weiss via cctalk wrote2 > >> On May 12, 2018, at 1:03 PM, Noel Chiappa via cctalk >> wrote: >> >> Hey, all, the RK11-D contoller for the PDP-11 uses Motorola 4015 MSI chips on >> one of the boards (M7254), but I can't find out anything

Re: Looking for info on Motorola 4015 chip

On 5/12/18 11:36 AM, Al Kossow via cctalk wrote: > same as the 7475 the direct replacement table lies. it's quite different than a 7475

Re: Restoring a PC Server 500 P/390

On 05/12/2018 05:32 AM, Dave Wade via cctalk wrote: I am rebuilding a Microchannel server with a P/390 card. Will you be chronicling this process anywhere? I'd like to observe from a distance. Blog / Twitter / other? -- Grant. . . . unix || die

Re: Looking for info on Motorola 4015 chip

> On May 12, 2018, at 1:03 PM, Noel Chiappa via cctalk > wrote: > > Hey, all, the RK11-D contoller for the PDP-11 uses Motorola 4015 MSI chips on > one of the boards (M7254), but I can't find out anything about them. Google > didn't turn anything up, and the appendix in

Re: Looking for info on Motorola 4015 chip

It's in the 1971 moto ttl data book page 37 same as the 7475 On 5/12/18 11:03 AM, Noel Chiappa via cctalk wrote: > Hey, all, the RK11-D contoller for the PDP-11 uses Motorola 4015 MSI chips on > one of the boards (M7254), but I can't find out anything about them. Google > didn't turn anything

Zenith Z-90 startup

Any Zenith Z-90 owners out there (which appears to be the same thing as a Z-89 / Heath H89, but with a DD soft-sectored disk controller)? I was given one up a couple of days ago which isn't giving the expected "H:" prompt at power-on - but it *does* give a blinking cursor, and hitting

RE: Restoring a PC Server 500 P/390

Folks, Can I say thanks to the folks that helped me "off list". I have found that if I use the latest version of the P390 support software it doesn't need Communications Manager. Dave From: Dave Wade Sent: 12 May 2018 12:33 To: General Discussion: On-Topic and

Looking for info on Motorola 4015 chip

Hey, all, the RK11-D contoller for the PDP-11 uses Motorola 4015 MSI chips on one of the boards (M7254), but I can't find out anything about them. Google didn't turn anything up, and the appendix in the RK11-D Maintenance Manual that has info about 'all' the MSI chips used in the RK11-D doesn't

R: Next 'stack' of computers to go, IBM p7's - not classics this time

48.x KG for the rack version, according to the redbook. Reminds me of the time I fell into an open traphole with a portable AS/400 in hand. The concrete chipped... the AS didn't have even a scratch in the paint -Messaggio originale- Da: cctalk [mailto:cctalk-boun...@classiccmp.org] Per

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

> From: Pete Lancashire > Pak Mail is not cheap Actually, since they buy 'in bulk' from carriers, they are surprisingly reasonable; their quote to ship an H960 rack from Arizona to me was less than I was quoted by some carriers. Noel

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

I was asked about configuration. Everything nowadays is a bit foggy but one of the p720 s I had converted to a split back plane and was running it with a pair of VIO serves it is also setup for Enterprise VM. It also has fiber cards to go to a SAN The other was a standalone DR that's the one

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

> From: Yvan Janssens > ... > I'm located at the other side of the planet. > Would PakMail work for that as well? Pakmail can _send_ to most countries (they can only do _pickups_ in the US and Canada, that I know of), but of course sending a large object a long way

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

Noel is right there is Pak Mail. But Pak Mail is not cheap and these suckers weight a lot my guest is stack is about 300 lbs On Sat, May 12, 2018, 6:28 AM Noel Chiappa via cctalk wrote: > > From: Pete Lancashire > > > NO PACKING OR SHIPPING, must be local pickup.

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

I am quite interested in one of them, but I’m located at the other side of the planet. Would PakMail work for that as well? On Sat, 12 May 2018 at 14:28, Noel Chiappa via cctalk wrote: > > From: Pete Lancashire > > > NO PACKING OR SHIPPING, must be local pickup. >

Re: Next 'stack' of computers to go, IBM p7's - not classics this time

> From: Pete Lancashire > NO PACKING OR SHIPPING, must be local pickup. Just a reminded to everyone; most PakMail franchises are prepared to go somewhere off-site, pick items up where they sit, and then pack them; I've used this service several times for 'pick up only' items.

Next 'stack' of computers to go, IBM p7's - not classics this time

This time not so 'classic' My last job was maintaining IBM p7's and eventually p8's. One thing I started was putting together a home setup. But like all the other projects the gear has become redundant to me. The 'stack' consists of 2 each IBM p720's, a CR6 HMC, and a KVM drawer. The p720 do

Restoring a PC Server 500 P/390

Folks, I am rebuilding a Microchannel server with a P/390 card. It must have come with a licence for OS/2 Communications Manager as its required to get the P390 working but despite having several boxes of CDs and Floppy Disks I can't find a copy of this software anywhere. If anyone has a copy