M7891 switch settings? (unibus) - test-drb@ccmp.vtda.org

23 Jan 2004

Correct. MM is for core, MS is for chips.
I was too lazy to check what I was writing.
I even have MM11-LP (96 kWords) in my 11/35.

I passed the morse code exam last December, and since
I had to choose a new call, the postfix PDP seemed a
nice one. "PDP" in morse code is not the best choice,
but I just could not resist. I am not active on HF,
waiting until Spring to install a antenna (aerial).

nice weekend all,

- Henk

...
  -----Original Message-----
 From: Frank Arnold [mailto:fm.arnold@gmx.net]
 Sent: donderdag 22 januari 2004 20:10
 To: cctech(a)classiccmp.org
 Subject: RE: M7891 switch settings? (unibus) 

 From: Gooijen H &lt;GOOI(a)oce.nl&gt;
Subject: RE: M7891 switch settings? (unibus) 

I have scanned 11/34 field maintenance print sets.
They are at http://www.mainecoon.com/classiccmp/
And if I am not mistaken the MOS memory is there too.
AFAIK is MS11 correct, just the suffix letter makes
all the difference (core, 11/44 MOS, etc.)  
 MS11-xx is alway semiconductor memory of different capacities 
 and speed as specified by the last two caracters
 (to the best of my knowledge...)

 MM11-xx are the true core memories with the ferrite cores.
 (Wanna see a MM11-YP, 32k x 18 core-stack? Then bump the 
 cofee-machine)

 several years after Mos memory became available people were 
 still talking about core if they just meant the mainstorage
 or R/W-Memory, regardless of the technology it was built with.

  gd luck,
- Henk, PA8PDP              ^^^
 Heh heh, on what frequency is it radiating?
 Do you remember the little proggys that would make a pdp 
 produce sound on an AM-receiver not tuned to any station?

 > -----Original Message-----
> From: Brad Parker [mailto:brad@heeltoe.com]
> Sent: donderdag 22 januari 2004 1:18
> To: arcarlini(a)iee.org; General Discussion: On-Topic and 
> Off-Topic Posts
> Subject: Re: M7891 switch settings? (unibus) 
> 
> 
> "Antonio Carlini" wrote:
> >> Does anyone have a manual for an M7891 (128kx18 MOS memory)?
> >
> >Is that an MS11 of some sort?  
 if it is 128kx18, then it is a MS11-LD, and has an integrated parity
 controller. I should have the maintenancemanual somwhere if 
 it of use to
 anyone. I will sent a free copy to aomeone who likes to 
 convert it to .pdf
 file to be put on-line. (Will have to dig it from the garage, however)

 Frank 