What does an M8579 go into?

From: Jack Peacock <peacock_at_simconv.com>
Date: Thu May 21 17:43:05 1998

From: Daniel A. Seagraves [mailto:DSEAGRAV_at_toad.xkl.com]

Wait a minute! ECC uses 2 bits?
That leaves 9.
9, 18, 27, *36*.
Something 36 bits maybe?

There were several types of ECC schemes. Some worked at the byte level,
some by the word. PDP memory boards commonly uses 22 bit words (16 data
+ 6 ECC), or accessible as 11 bit byte (8 data + 3 ECC). Memory boards
based around Intel 256K DRAM controllers also supported this type of ECC
(I think it was the 8206/8207 chipset?). The Intel ECC scheme was neat
because it would scan for errors during refresh cycles, "bit scrubbing".

Memory is vague, but I believe the 11 bit ECC byte was a Reed-Solomon
type ECC pattern?
        Jack Peacock
Received on Thu May 21 1998 - 17:43:05 BST

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