DEC top-mount corporate cabinet
On Saturday (02/26/2022 at 03:21PM -0500), pbirkel--- via cctalk wrote: > A top-mount corporate cabinet looks like this: > http://www.cosam.org/images/pdp11-23/front2.jpg The "DECDatasystem" > front-bar in the photo is over the 1U strengthener that braces the upper > portion of the rack ... since there is no brace at the top (as yours has). > Your cabinet will work fine; in my experience RL02's are always tight and > fiddly any place but the top-spot. Is there a (hand-)book that describes the DEC cabinets and in particular this "top-mount corporate cabinet"? Is there a BA # for this cabinet? I have an 11/34 in said cabinet but it is missing this 1U strengthener although I do have the 1U front-bar. I had to jigger a means to hold the front-bar in place and have been unable to understand how it would correctly attach to the rack and the strengthener, probably because I don't have the strengthener! Any part numbers or drawings that show this arrangement would be quite helpful. Thanks! Chris -- Chris Elmquist
Re: DEC top-mount corporate cabinet
On 2/28/22 14:07, Chris Elmquist via cctalk wrote: On Saturday (02/26/2022 at 03:21PM -0500), pbirkel--- via cctalk wrote: A top-mount corporate cabinet looks like this: http://www.cosam.org/images/pdp11-23/front2.jpg The "DECDatasystem" front-bar in the photo is over the 1U strengthener that braces the upper portion of the rack ... since there is no brace at the top (as yours has). Your cabinet will work fine; in my experience RL02's are always tight and fiddly any place but the top-spot. Is there a (hand-)book that describes the DEC cabinets and in particular this "top-mount corporate cabinet"? Is there a BA # for this cabinet? There's a picture of one with the 11/24 in the small box in it on the cover of the 1981 PDP11 Processor Handbook. You can see from the spacer between the 11/24 and the bottom RL02 that it could also accommodate the larger box version of the 11/24. bill
Re: DEC top-mount corporate cabinet
On 2/28/22 14:47, Bill Gunshannon via cctalk wrote: On 2/28/22 14:07, Chris Elmquist via cctalk wrote: On Saturday (02/26/2022 at 03:21PM -0500), pbirkel--- via cctalk wrote: A top-mount corporate cabinet looks like this: http://www.cosam.org/images/pdp11-23/front2.jpg The "DECDatasystem" front-bar in the photo is over the 1U strengthener that braces the upper portion of the rack ... since there is no brace at the top (as yours has). Your cabinet will work fine; in my experience RL02's are always tight and fiddly any place but the top-spot. Is there a (hand-)book that describes the DEC cabinets and in particular this "top-mount corporate cabinet"? Is there a BA # for this cabinet? There's a picture of one with the 11/24 in the small box in it on the cover of the 1981 PDP11 Processor Handbook. You can see from the spacer between the 11/24 and the bottom RL02 that it could also accommodate the larger box version of the 11/24. bill As a follow on note That was what the very first personally owned PDP-11 was. It came to me from HighLights Magazine thru my job at the University of Scranton. I miss that machine. Sorry I ever got rid of it. bill
Re: HP 9915A failed 8048
On 2/26/2022 3:21 PM, Tony Duell via cctalk wrote: On Sat, Feb 26, 2022 at 5:19 PM js--- via cctalk wrote: As the chances of success are highly improbable, looks like I'm SOL on this particular motherboard. My bench is rather full at the moment and will be for a few more weeks... But if you get no other help and you can wait a bit, I believe one of my old EPROM programmers can read the 8048/8748 with the right adaptor, and the schematic of that is in the manual. I also have a working (I hope) HP9915. So I could have a go at making said adaptor, extracting the 8048 from my HP9915, and readng it out. You would then have to find somebody who could program the ROM image into an 8748. -tony Hi, Tony! Long time! Thank you VERY MUCH for your very generous offer! Dave McGuire was extremely kind to send me a ROM dump of the HP 9915's 8048, that he had -- to my amazement -- already made for himself. So to my complete surprise, I do have the ROM contents at this point. I've a Data I/O 2900 which supposedly can program the 8748, so I'll give that a try if I can figure out how to use it again (been a long time). I've ordered a NOS 8748 off eBay. I'll give all this a try and post results here. - John Singleton
