1 Mar
2018
1 Mar
'18
3:12 a.m.
On 02/28/2018 08:15 PM, Douglas Taylor via cctalk wrote:
Is there a document that describes the bank 7 memory
page and what
addresses are reserved for what?? I think I've seen this before but
can't seem to put my hands on it.
Another question, bootstrap is reserved for 173000, how many words are
allowed there for this?? How do the more complicated bootstraps, e.g.
microPDP11-53, accommodate this limitation?
Doug
I strongly suggest RTFM the PDP-11 handbooks.
Till you do...
Page 7 is? the upper most memory area and is reserved as EPROM and IO
peripherals. On many of the
PDP-11s that page is signified by asserting BBS7 ( a partially decode
address) and the MMU also
understands that peripherals live in that physical space be it 16/18/22
bit memory map.
Boot and diagnostic roms are a special case as more often their size was
not limited to the area of bank 7
but the available devices of the day.? They do however map roms so that
they cannot overlap the IO
devices.
FYI the microPDP-11/53 is the 11/23+ cpu card so you can look that up.
Allison