15 Jan
2007
15 Jan
'07
11:46 a.m.
On 15 Jan, 2007, at 18:00, cctalk-request at classiccmp.org wrote:
Many thanks Dwight.
A pity they did not at least use RAM instead of ROM.
Roger.
Can anyone
please tell me if the Olivetti M20 used a Z8010 memory
management unit?
---snip---
Hi Roger
No, it didn't use a 8010. It could have but I believe that when
the project was started, the 8010 wasn't ready yet.
They used a ROM instead. They do a number of interesting
logical to physical mapping but these could have been done
with a 8010 just as easily ( and more flexibly ).
Most of the mapping is to handle the holes that the video
causes. Some is related to the dual mapped memory.
Even with the full 512K of memory, I don't know of any
application that needed more than 384K.
Dwight