23 Mar
2022
23 Mar
'22
5:28 p.m.
On Wednesday (03/23/2022 at 04:18PM +0100), Christian Corti via cctalk wrote:
On Wed, 23 Mar 2022, Chris Elmquist wrote:
Intel called it "Intelligent Identifier(tm) Mode".
From page 5-43 of my 1991 Intel Memory Products book, for the 27256,
You put Vh (+12V) on address A9 and then,
with A0=0, you will read out the manufacturer ID
with A0=1, you will read out the device ID
Chris
--
Chris Elmquist
More interesting. If the programming algorithms
remained the same then I
guess it is just an issue for the programming system-- when it auto-IDs,
it should display (and allow!) 27C256A instead of 27C256.
I guess the next question is whether the programming algorithms really
are the same between the 8CH and the 8DH variants??
My limited testing suggests they are at least compatible since my 8DH
appears to be working when programmed as an 8CH.
I didn't even know that primitive EPROMs have device IDs...
Without looking for a data book, how is the ID mechanism implemented?