24 Mar
2000
24 Mar
'00
12:06 a.m.
Virtual memory - yes! It grabs RAM if you have enough
(which you do not)
and the VM.SYS device driver makes VM: look like a disk drive. If you had
4 MBytes of memory and used 2 MBytes for VM:, that would give you a device
of 4096 blocks.
VM: is not virtual memory, it is ramdisk. VM would be paging unused or
old sections of code to disk to make the system ram look logiccally larger
than the physical. RT-11 doesn't, it does swap jobs to a disk (or VM:).
True virtual memory on PDP11 is implmented in unix and RSX OSs.
Allison