13 Nov
2005
13 Nov
'05
6:10 p.m.
Subject: Re: semi-homemade micro
From: woodelf <bfranchuk at jetnet.ab.ca>
Date: Sun, 13 Nov 2005 17:19:15 -0700
To: General Discussion: On-Topic and Off-Topic Posts <cctalk at
classiccmp.org>
Allison wrote:
I think there is a 22bit forth machine out there and ofcourse people
have done FPGA PDP10 and I also heard once someone doing an 18bit
PDP7.
What do you mean by "Well what about
them?"?
Tell me more about them! Non 8 bit word length computers. All my small C stuff is stored safe in my bitbucket.
It has too many
8080 design gotya's to generate code for the cpu design I have now.
I don't have register to regsister addressing and indexing from the
A register.
And that stopped you? really I have a SmallC compiler that produced
ok 8080 code. By OK it's as good as an 8080 can do.
Out here all the junk is dead PC's. :(
Thats largely what we have here these days. However 386 and 486
board have nice cache rams some TTL and the like. That and I find
in piles.
Want to try an
emulation project? take a 8048 or 49, strap EA
(uses external rom then) and write a program to make port 0 and
some latches and stuff on the bus port look like a version of
your favorite CPU of any word length. Sure it will be slow
(8049 @11mhz run instructions at 1.3us) but different! hang
ram rom and IO even front pannel on the emulation and you have
anything you can imagine and fit in 4k or eprom and 128bytes
of internal ram (8049). Those 8048s and 49s are common and
easily found in keyboards (LK201 has the faster better 8051!)
and is a cool old cpu to work with.
That is a nice idea!
6978
days inactive
6978
days old
0 comments
1 participants
participants (1)
-
ajp166＠bellatlantic.net