> From: Paul Koning <[email protected]>
>>> core memory details such as destructive read weren't visible to the
>>> CPU
> DATAIP/DATAO on the Unibus doesn't depend on the destructive read
> property.
Yes, the CPU can't tell what the memory is doing.
> The reason it existed is that it allows core memory to optimize the
> timing
In other words, it's only there to allow the CPU to act in a way that works
well with core memory. Whether that means that the way core operates is
"visible" to the CPU is a debate about definitions.
Put it another way - do any modern CPU's do 'read-modify-write' cycles (other
than for interlocks in a multi-CPU system)?
Noel
