[11/23] Please identify this board

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3 total messages Started by Greg Hankins Fri, 22 Jan 1993 20:54

#262

Author: Greg Hankins
Date: Fri, 22 Jan 1993 20:54

25 lines
1438 bytes

I've just received this pdp-11/23, and I'm in the process of figuring out
what all the boards in it are.  I have all of the DEC handbooks, so I've
identified all the DEC boards, but there are 2 of these boards that I
can't identify.

These boards are double slot size, with white "tabs" on the end of them.
On those tabs are black "W" looking things, or it could be a "3".  The end
towards the bus connectors has 2 things stamped on it, "MSC 4601", and
"303-0171", and also a serial number of some sort.  On the other end,
there is a very heavy 4x8 array of Motorola MCM4116AC25 socketed chips.

I think that this can only be a memory board...?  It has no I/O connectors
of any kind.

Any hints on what it could be, along with anything else you have to say about
it, would be very appreciated!



Greg

"Oh, what sad times are there  | Greg Hankins 
 when passing ruffians can say | CoC Computer & Networking Support          
 'Ni!' at will to old ladies!" | Georgia Institute of Technology
      - Roger the Shrubber     | email: gregh@cc.gatech.edu

Re: [11/23] Please identify this board

#298

Author: zrepachol
Date: Sat, 23 Jan 1993 22:19

20 lines
1515 bytes

In article <1993Jan22.205405.2341@cc.gatech.edu>, gregh@cc.gatech.edu (Greg Hankins) writes:
> I've just received this pdp-11/23, and I'm in the process of figuring out
> what all the boards in it are.  I have all of the DEC handbooks, so I've
> identified all the DEC boards, but there are 2 of these boards that I
> can't identify.
> 
> These boards are double slot size, with white "tabs" on the end of them.
> On those tabs are black "W" looking things, or it could be a "3".  The end
> towards the bus connectors has 2 things stamped on it, "MSC 4601", and
> "303-0171", and also a serial number of some sort.  On the other end,
> there is a very heavy 4x8 array of Motorola MCM4116AC25 socketed chips.
> 
> I think that this can only be a memory board...?  It has no I/O connectors
> of any kind.

Yep. 16 KW ( 32 KB ) Almost certainly 18 bit. See if you can get >256K boards
( 22 bit addressing ). Virtualy ever 11/23 had 22-bit except a few very rare
rev C boards. Not that a certain company would admit to it mind.

~Paul

Re: [11/23] Please identify this board

#299

Author: Megan B Gentry
Date: Sun, 24 Jan 1993 23:40

14 lines
1014 bytes

zrepachol@cc.curtin.edu.au writes:

>Yep. 16 KW ( 32 KB ) Almost certainly 18 bit.

	16 address bits gives you up to 64kb, 18 bits gives you up to
	256kb.  22 bits gives you 4mb.

>( 22 bit addressing ). Virtualy ever 11/23 had 22-bit except a few very rare
>rev C boards. Not that a certain company would admit to it mind.

Actually, the 11/23 (KDF11-A rev.a) was only 18-bit addressing due to the
fact that the extra four address lines terminated on-board.  The KDF11-A
rev.c actually brought them out to the fingers, providing full 22-bit
functionality.  The 11/23plus (KDF11-B) always provided 22-bit support.

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