24 Feb
2006
24 Feb
'06
1:11 p.m.
Don North wrote:
...
If Guy really can implement a 22b examine/deposit physical memory in a
pure SPC slot kudos to him. The only way I can think of possibly doing
it (thinking out loud again :-) ) is to steal a UNIBUS map entry and on
each exam/deposit set it up correctly to map the 18b unibus address to
the desired 22b address. I don't recall if the UNIBUS map is accessible
from the UNIBUS itself (if it is, this could work; if not, then it won't).
If it's accessible from the unibus you don't have to steal it - you
could just "barrow" the entry for a moment.
I'd smile to see a PIC running bus master cycles, however :-) Me? I'm
using an ARM :-)
-brad