6299Re: [cosmacelf] 1802 Emulations
- Jan 1, 2010Very interesting,
Lots of very new concepts in processor and system design deployed there--
including scan path/boundary scan testing and debug.
They do say though that the machine was mostly ECL rather than TTL-- with
an instruction cycle of 60nS.
On Thursday (12/31/2009 at 11:53PM -0600), Lee Hart wrote:
> J.C. Wren wrote:
> > I've been writing firmware for 2^5 years, and seen a lot of processors come
> > and go. I looked at the Propellor when it first came out, but I couldn't
> > get myself interested in it. Maybe something like the Propellor Starter Kit
> > that cwardell2000 mentioned might be a way. It's probably that I couldn't
> > find a use for it...
> One of my favorite computers was the Dorado, made by Xerox in the 1970's
> as the the platform to run Smalltalk on. It had a microprogrammable CPU,
> made with TTL chips. What was neat about it was that the instruction set
> was not fixed; it was downloaded from disk to suit the application
> program being run.
> This meant it could emulate all the different CPUs of the day at full
> speed. It had emulations of the 8080, 8085, Z80, 6800, 6502, etc. I
> don't know if there was one for the 1802, but it certainly could have
> done it.
> More importantly, it could emulate the special *hardware* that various
> computers had. It *became* a TRS-80, Apple II, IMSAI 8080, etc. I am
> sure it could become an ELF or VIP as well, if someone wrote the code.
> The Propeller is the first modern chip I've seen that might be able to
> perform this sort of trick.
> Lee A. Hart | Ring the bells that still can ring
> 814 8th Ave N | Forget the perfect offering
> Sartell MN 56377 | There is a crack in everything
> leeahart earthlink.net | That's how the light gets in -- Leonard Cohen
- << Previous post in topic Next post in topic >>