Drum vs. Core

[Allison]

>
>Subject: Re:  Drum vs. Core
>   From: "Chuck Guzis" <cclist at sydex.com>
>   Date: Fri, 29 Jun 2007 13:49:22 -0700
>     To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>While the main store on the IBM 650, didn't most of the installed 
>base (eventually) also have 50 words of core as sort of a 
>"scratchpad" memory?
>
>Cheers,
>Chuck

This was common.  The problem with rotating memory, mercury delay, 
magnostrictive delay and even shift registers is they are not random 
access they are sequential access  They all have a fixed delay and you 
wait for what you want to "come around".  Programmers had to program 
around that if speed was required.


Allison