🚀 go-pugleaf

In article <661112755wnr@kumquat.demon.co.uk>
           Toby@kumquat.demon.co.uk "Toby Crake" writes:

|
| Note:  36bit = Parity     (4x9bit)
|        32bit = Non-Parity (4x8bit)
|
| The easyest way to tell Parity from non-parity is to see if the number
| of chips is divisible by 9 or 8, yours have 18 therefore are Parity.
|
| Unfortunately this doesn't always work as the Parity check chip(s) may
| be very small and so not get counted.
|
| Toby Crake
|
   I'm not too happy with the last bit of that reply. A SIMM should
   niether check nor generate a parity bit but only _store_ it i.e.
   there should be an sufficient DRAM for 9 bits per byte.  IMO a SIMM
   that uses a chip to generate a _fake_ parity bit is worse than
   useless; though I have heard they exist.  The point of the parity bit
   is that it should validate the _whole_ data path, from the CPU/parity
   generator all the way out to the memory array and then all the way
   back again to the CPU/parity checker.

--
Peter Hayward, Cambridge, UK.      | In a democracy the public will only
peter@cdsl.demon.co.uk             | respect laws if they respect the
tel +44-1223-312-923               | politicians that make them.