8 Jul
2007
8 Jul
'07
1:12 p.m.
Allison wrote:
There is a lot of "you can do" but building a CPU comes down to what do
you want to do and can reasonably achieve or can practically play with
once functional. Unfortunately some want a cpu that can run unix and an
IP stack others want just enough to qualify as a computer for close up
examination of "just how do they do it?" and that represents a large
spread of design and architecture possibilities. Having built machine
from very simple state logic to an elaborate 16bit bitslice I can say
all are interesting but some are a lot too much work.
Memory is a interesting problem , if you don't use 8 bit bytes
or you need more than 32K. Since I had use of computers after
1980 64Kb or more seems normal. I am shocked
at how hard it is get any memory size at all using static
memory with the 75 to 80's chips and still not use
up mammonth amounts of power or large # or boards.
Allison