30 Jun
2007
30 Jun
'07
6:57 a.m.
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
1 Jul
1 Jul
9:11 a.m.
On 30 Jun 2007 at 9:57, Allison wrote:
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.
Hence, "plus one" addressing and SOAP on the 650.
Cheers,
Chuck
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