test-drb

test-drb@ccmp.vtda.org

101090 discussions

by abacos_98＠yahoo.com

I have a CDC BK6XX BK7XX Maintenance manual Vol 2 available.If anyone has an immediate need I will send it free but please passit on to Bitsavers after scanning as I did not see this one listed. Brian.

7 years, 3 months

Telex 20 Meg 10 platter very heavy monster drive needed drop line off list..r

by couryhouse＠aol.com

2311? was? not? ?20? megs..... from? what? I? saw... what is the? ?#? ?for the? 20 meg? telex? drive?thanks? ed# In a message dated 4/22/2019 10:01:04 AM US Mountain Standard Time, cctalk at classiccmp.org writes: On 4/22/19 9:49 AM, ED (knuttjobb) SHARPE via cctalk wrote: >? Telex 20 Meg 10 platter ?very heavy monster drive needed drop line off list thanks Presumably he is looking for a Telex 2311-compatible drive, but who knows wtf Ed says.

7 years, 3 months

Still looking for a RK611

by abacos_98＠yahoo.com

Hello, ?I have just about all the pieces I need to start work on getting at least one of my RK07's running. I found cables, terminators and cab kit but still need to find an RK611. I have just a few things I could trade. A very nice PDP11 labeled header panel for a DEC rack.No broken ears and not all scratched up. Brand new DECstation 5000/260 processor. Some non-DEC early PC boards. I would also pay a reasonable price for one. Thanks,Brian.

7 years, 3 months

IBM 6360 - interface help?

by anders.k.nelson＠gmail.com

Hey all, I'm writing a blog post about this IBM 6360 disk controller I want to build: https://www.andersknelson.com/blog/?p=601 I've read through the service manuals and other docs on Bitsavers but I can't seem to find a deeper explanation on the protocol that runs over the DB-37 cable. I suppose I could bypass the controller inside the drive cabinet and directly control the drives but I bet it'll be easier/better to use as much of the electronics as possible. Can anyone help with the protocol? Thanks! -- Anders Nelson +1 (517) 775-6129 www.erogear.com

7 years, 4 months

DEC PDP-11/70 cabinet setup

by jnc＠mercury.lcs.mit.edu

> From: Nigel Williams >> it's the same as all the other PDP-11 etc logo panels,... > when you say "same", as in the same text as well? Sorry, I should have been more explicit. 'Same physical shape' is what I meant; just different stuff painted on the insert. > thanks for the confirmation. Sure, glad to help. Noel

7 years, 4 months

DEC PDP-11/70 cabinet setup

by jnc＠mercury.lcs.mit.edu

> From: Nigel Williams > I'm wondering if on a real 11/70 there is a 5mm gap between the > masthead and the rack blanking panel below it? If by "masthead" you mean the thing DEC calls a "Logo Panel" (see 11/70 Engineering Drawings, 'Unit Assembly', pg 1 of 5), it's the same as all the other PDP-11 etc logo panels, the -11/70 just has an inlay (thin metal sheet) which is painted differently. And yes, there's a 5mm gap between the top of the top 10-1/2" blank panel, and the bottom edge of the logo panel. Noel

7 years, 4 months

Telex 20 Meg 10 platter very heavy monster drive needed drop line off list..r

by couryhouse＠aol.com

Subject: Telex 20 Meg 10 platter ?very heavy monster drive needed drop line off list.. Telex 20 Meg 10 platter ?very heavy monster drive needed drop line off list thanks Ed# ---hope this works and see ds from phone ok... thx-------

7 years, 4 months

Rgb intensity line

by billdegnan＠gmail.com

I am fashioning an RGB cable from parts. The computer (LNW80) does not send an "intensity" signal, it is only a 6pin rgb. The magnavox rgb 80 display that I wish to use to receive has a pin for an intensity signal. Other than "intensity" the rgb signals can be matched up. Question...what happens when a computer does not send an intensity signal to a display that has this input? I will find out soon enough but I am curious to ask before I begin should anyone have a suggestion. Do I need to add a resistor off of ground or something to fix it to something? Bill

7 years, 4 months

DEC PDP-11/70 cabinet setup

by nw＠retrocomputingtasmania.com

I'm hoping to (partially) recreate an 11/70 setup, at least as close as I can get with what I have on hand (see the first pic in this gallery that shows the 11/70 advert): https://imgur.com/a/pvgUVmg I don't have the right masthead but I'm wondering if on a real 11/70 there is a 5mm gap between the masthead and the rack blanking panel below it? I can't see with these pieces a way to close the gap, but I'm curious as to whether the real thing also has the gap? thanks.

7 years, 4 months

Plane of core memory

by jnc＠mercury.lcs.mit.edu

> From: Curious Marc > I believe 3 wire memory was first introduced by IBM in their 360 > systems ... They would almost certainly have patented their way to do it Correct (and your knowledge and memory is good)! Motivated by this clue, I looked in: Emerson W. Pugh, "Memories That Shaped an Industry" MIT Press, Cambridge, 1984 where the description of the invention of 3-wire core can be found on pg. 231; it was invented by a group of engineers, based on a similar idea used in Stretch. There is indeed a patent, No. 3,381,282, with six names on it. IBM must have licensed it, but there is nothing on that. I can highly recommend that book; it's in the same league as the later two books on early IBM computers from MIT Press on which he was a co-author. Noel PS: There was recent discussion here of the 8000 series; there are some details on that on pp. 189-191.

7 years, 4 months

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