8 Jul
2007
8 Jul
'07
3:06 p.m.
Allison wrote:
If I were to do a TTL design right now I'd use
32Kx8
(or larger) parts even if the word size were 9 or 11 bits
as they are cheap and easy to use and the unused excess bits
are no real loss.
11 Bits ??? What uses that?
Maybe because every time I did TTL or slice design I
wasn't
trying to make a period machine or be faithful I was doing
some sacrelige but I was having fun and the expereince was
no less because the memory, logic used or terminal was
way out of period.
If this your hobby , the main thing is to have fun.
Heck the guy that did the Apollo AGC has a hats off to
me as
he did in TTL something conceived as RTL with minimal data.
If anything not only was a working machine a significant
accomplishment but the information about it he dug up, made
visible to public and preserved along the way speaks to
great work.
That was great work.
For those that try and or succeed to build a PISC
(Pitiful Instruction Set Computer) or a VSC (Very
Simple Computer) they are contributing a lot to the
science and history of computing. After all there
are many old (really old) machine preserved and sitting
that most of us have not the first idea how to power
up and program. Those that do it get my attention for
their efforts.
The Kenback 1 and the 6800 replica's that come
up is great work too. I wish I could get him
to do my cpu from my hen scratched schematics.
Now the biggest problem I have is do I want
Single Instruction or not with my minimal front
panel? Is that used that often that it needed?
Ben alias woolelf
PS. How are IRQ's handeled when single stepping?