6 Jul
2007
6 Jul
'07
11:56 a.m.
Jos Dreesen / Marian Capel wrote:
He may not but I do!
I can't resist nixie output. :)
Questions: have any others on here done stuff
like this, or have any
pointers to good resources? I'm learning as I go along here, flicking
through technical manuals for 8-bit CPUs etc. and gleaning what I can
from the web.
I made, in 1986, a 12 bit machine with raw TTL.
Switches as input, 4 nixies as output, ca. 120 IC's.
Parallel, with 3x181 as Alu, 3x194 as accu/shifter, and a dedicated
hardware stack separate from the main 4Kx12 memory.
Actually building and debugging it was the hardest part.
Go for parallel, it is easier and will not be that more expensive in
partcount.
Let me know if you want my schematics Jos
PS. To the original
post: Since you found magic , there is a lot of other CPU's
on the "Homebuilt CPUs WebRing"
Also the latest design I working on uses about 26 LS parts for control
and 4 512x8 proms. Using proms really simplifies your control logic.
This is a 24 bit cpu on three cards - control logic on one, 2901 bit
slice on two cards. The alu card is about 14 LS chips + 3 2901's per
card. Since this is a *slow* machine I can use ripple carry and LS
parts.