From: "William Chops Westfield"


> On Friday, Dec 12, 2003, at 04:46 US/Pacific, michael brown wrote:
>
> >  All in all, roughly comparable in power to a low end PIC
>
> nah.   IIRC, while the 1802 ran at up to 10MHz (when powered
> by 12V), it also used something like 16 (!) cycles per
> instruction, compared to four for the PIC.  A weird beast

I don't know, 10MHz sounds pretty high to me at least for a 1978 vintage
processor.  Mine ran at (3.58MHz / 2).  8 clock "ticks" per machine
cycle, most instructions taking two or three cycles.

> by todays standards; something like 16 pointer registers.
> And of course the famous "sex" instruction.

Yes, quite an interesting mnemonic.  ;-)  Did you test the "illegal"
op-code 0x68 to see what it did on your CPU?  If anyone has a spare
CDP-1861 lying around, I'd like to get my ELF going again.

michael brown

--
http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads