Re: [cosmacelf] Re: CDP 1802/4/5/6 ICEing on the cake
- On 3/1/2013 5:38 PM, urrossum@... wrote:
>Well... *most* existing software won't use it. But I can't say that
>>> the otherwise unused 68h... Does anyone know what a *real* 1802 does
>>> when it encounters this instruction?
>> That's easy! :-) Notice that 69-6F are the INP instructions? They put
> <...clip of excellent explanation..>
> Thanks, Lee! That makes perfect sense, and also affirms that I can use this instruction with impunity, since it should be of no use to any existing software.
someone somewhere didn't use that hardware trick. Or, you may run into
something that uses the 1804/5/6, which *did* use this as an active
If you're building an emulator, can't you use an "impossible" code like
An engineer can do for a nickel what any damn fool can do for a dollar.
-- Henry Ford
Lee A. Hart, http://www.sunrise-ev.com/LeesEVs.htm
- Dave Jones did a review of the TL866CS on his EEVBLOG.- Tom
--- In email@example.com, "joshbensadon" <joshbensadon@...> wrote:
> --- In firstname.lastname@example.org, "thinkpast" hjohnson@ wrote:
> > http://www.retrotechnology.com/herbs_stuff/gal.html
> > Some of the simplest PROMS can just be poked at and manually programmed. I reference some of that work on another Web page linked to the above page.
> > Herb
> Thanks Herb,
> Your web site lead me back to do another search on Ebay. I searched a few years ago without success, but now there are several to choose from!
> -TL866CS -$49
> -TOP853 $46 (does not list GAL 22V10)
> -TOP3000 $160
> -G540 -$60
> -G840 -$80
> -RT809F -$88 (does not have large ZIF socket, less versatile?)
> Several of these models include RAM testing and other CMOS Chip Testing, very impressive (if the tests are rigorous?).
> For these prices, it's not worth messing about building a home brew programmer. Heck, I've paid more for an adapter on my Andromeda Labs programmer.
> Right now I'm considering the G840, just on a hunch, but if anyone here can offer any advise, it would be much appreciated.