On 12/15/2018 03:51 PM, Jon Elson via cctech wrote: > On 12/15/2018 02:45 PM, Anders Nelson via cctalk wrote: >> Serial flash has an endurance between 10K-100K writes per cell so I >> think >> that would break down quickly. Wear-leveling on a serial device would be >> very slow... >> >> > If you intend to use it as main core memory on an old CPU, it will > perform VERY poorly, as these memories need to erase a page at a time, > and the erase takes milliseconds. So, writing ONE SINGLE word at a > time would invoke an erase cycle each time, slowing it to 1/1000 or > worse the speed of the original core memory. Also, most old CPUs have > the memory timing built into the CPU, and can't handle a memory that > says "wait". > > Jon The only place where Flash or similar tech fits is applied to the mass storage problem such as replicating a RF/DF32 multihead disk.
The cycle life is a limiting factor for things like swapping drums/disks but for something that's read mostly its ok. Core is RAM, and not serial anyway. Allison
