[HECnet] VMS/RSX Guest accounts --> 2020 memory extension

[R. Voorhorst]

L.S.

The memory extension from 1 --> 2-->4 MW are quite easy to implement within the 2020 KS10 architecture, few extra mapping bits in the CPU and Unibus maps are all that is needed.
Though in current hardware maybe a bit difficult:  2 more bits in the UBA rams, etc. in Simh it is easy to do.
 
As Tops10 was developed onto KL10 and modified for KS10, the real limits of Tops10 was really the 4 MW barrier i.e. 13 bits versus 11 bits.
The KS10 modifications were relatively simple to adapt to larger sizes,  BOOT inclusive.

R.V.

-----Original Message-----
From: owner-hecnet at Update.UU.SE [mailto:owner-hecnet at Update.UU.SE] On Behalf Of Dave McGuire
Sent: Wednesday, 29 April, 2020 19:58
To: hecnet at Update.UU.SE
Subject: Re: [HECnet] VMS/RSX Guest accounts

On 4/28/20 11:51 PM, Thomas DeBellis wrote:
> You know, I have been racking my brains from time to time and I can't 
> remember a thing about the ADP modifications to the 2020.

  I myself know very little about the specifics. (I'm mainly an -8, -11,
and VAX guy)   I would guess Peter Lothberg knows quite a lot about it.

> Did you pick up any software with these little jewels?  The monitor 
> changes might be interesting.

  No software, unfortunately.  Just the iron.

  BTW, one of our museum folk is working on the 36-bit quote swag now.

          -Dave

--
Dave McGuire, AK4HZ
New Kensington, PA