FPGA VAX update, now DIY TTL computers
ajp166 at bellatlantic.net
Thu Nov 3 17:39:45 CST 2005
>Subject: Re: FPGA VAX update, now DIY TTL computers
> From: "Chuck Guzis" <cclist at sydex.com>
> Date: Thu, 03 Nov 2005 15:22:03 -0800
> To: cctalk at classiccmp.org
>On 11/3/2005 at 7:53 PM ard at p850ug1.demon.co.uk wrote:
>>There was a hrrible thing called fake parity memory. It stored 8 bits and
>>calaculted the parity bit on a read (ignored the incoming parity bit on a
>>write) to keep the memory controller happy. Of course you can't store 9
>>bits in that type of device.
>Of course you can, as long as the bits you're storing agree with the parity
>of the 8 bits...
If you ask me the real horror of parity memory is it only tells you disaster
happend just as your about to crash. It offers little to system reliability
and data integrity that real ECC can provide. Like Tim O' said years ago
it's all a plot to sell more ram.
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