From: "Rick C."


> I have a box of 1800 series chips. If I have one I'll let you have
it..
> Rick

You don't know how much I'd appreciate that, they're pretty rare.  :-)
They were used in RCA Studio-II and Radio Shack TV game units.  It's a
video output device that maps 256 bytes of ram to a TV type display as
32*64 monochrome, rectangular pixels.  Since the original ELF only had
256 bytes of RAM the program occupied part of the screen.  Kinda unusual
with the changing variable locations causing miscellaneous blinking
pixels.

michael brown

> michael brown wrote:
>
> > 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
> >
>
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