Core memory speeds

From: Jos Dreesen / Marian Capel <>
Date: Mon Jan 20 14:03:00 2003

On Monday 20 January 2003 12:02 am, ben franchuk wrote:
> Since I am building a classic TTL style computer, what was the access
> and cycle time of core memory before it vanished and just when did it do
> that? Also when did 74LS come out? I am aiming for late 70's early 80's
> time frame here since this looks to be the transition stage from the the
> old to the new. Ben

My 1975 core memory products catalogue ( Philips components ) lists modules
with cycle times ranging from 0.65 to 1.5 us ,both for 8kx18 stacks.

My newest core memory stack sits in my Philips P856 : dated 1980, cycle time

My own TTL computer, dated 1986, just uses 8kx8 SRAMs......

                                        Jos Dreesen
Received on Mon Jan 20 2003 - 14:03:00 GMT

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