Re: Real tape drive densities

2016-02-13 Thread Christian Corti
On Fri, 12 Feb 2016, Curious Marc wrote: Can you confirm it can read and write 9 track formats in PE 1600 cpi? Was there ever a 7970B with PE? I have the manual matching this unit (serial number is marked on the cover page) and there's no mention of PE AFAIK. It's the 1971 version of the

Re: Real tape drive densities

2016-02-13 Thread Christian Corti
On Thu, 11 Feb 2016, Christian Corti wrote: I have a 7970B (-236) with options 127, 006, 007, 012 and 023. According to the HP 1000 Peripherals Selection Guide from 1982, page 16, option 236 specifies an 800bpi master magnetic tape subsystem with one drive and two-card 13181B interface.

Re: pdp11/04 : the pics....

2016-02-13 Thread Eric Christopherson
On Fri, Feb 12, 2016, Charles Anthony wrote: > On Fri, Feb 12, 2016 at 8:29 PM, Eric Christopherson < > echristopher...@gmail.com> wrote: > > > On Feb 12, 2016 11:10 AM, "Jos Dreesen" wrote: > > > > > > > > > On ftp.dreesen.ch/PDP11 you can find some pics on how the rescued >

Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread Jacob Ritorto
Hi, Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b 4MB memory in my pdp11/73. Can anyone offer hints as to how to identify which component is broken and how to go about repairing this? It's the only memory board in this machine, so I guess the problem might

Re: Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread Jay Jaeger
On 2/12/2016 5:32 PM, Jacob Ritorto wrote: > Hi, > Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b > 4MB memory in my pdp11/73. > > Can anyone offer hints as to how to identify which component is broken > and how to go about repairing this? > > It's the only

Re: Stuck bits on 11/73 Clearpoint 4MB memory - how to repair?

2016-02-13 Thread John Robertson
On 02/12/2016 6:55 PM, Jay Jaeger wrote: On 2/12/2016 5:32 PM, Jacob Ritorto wrote: Hi, Seems I have bits 4 and 3 sticking on my Clearpoint QRAM-2-SAB-1 88b 4MB memory in my pdp11/73. Can anyone offer hints as to how to identify which component is broken and how to go about repairing

Re: IBM System z9 available near Ann Arbor, MI

2016-02-13 Thread Christopher Satterfield
There's another z9 in Vancouver, WA. Has two tape drives with it as well, but starting bid is $1200. http://www.publicsurplus.com/sms/auction/view?auc=1542011

RE: Real tape drive densities

2016-02-13 Thread CuriousMarc
> So, apparently my NRZI 9 track drive has the density option included, and I don't know if there were any other 200/556 bpi 9 track drives out there. > When we got the drive I had hoped it would be a 7 track drive, but it isn't. Now I finally get it. NRZI, 200, 556 and 800 densities, but in 9