Re: A86: Re: New operating system...
[Prev][Next][Index][Thread]
Re: A86: Re: New operating system...
On Mon, 22 Feb 1999 17:36:47 PST "David West" <bdaddy_mit@hotmail.com>
writes:
>>if you don't load it to a specific place, the program loader
>(whatever
>>runs the programs) would have to patch up every jp and call in the
>>program. well, i guess you could force the program itself to do that
>(i think that's how zshell worked), but that makes it too slow.
>
>just Load it once and do all the patch work when you load it into ram
>the first time. Then afterwords, you don't have to worry about this
yeah, i guess. you'd have to unpatch it if you wanted to transfer to
another calc, but i guess you'd have to anyway
>>it's possible to run programs up to ~30k without replacing the os.
>i've
>>written a nearly complete program loader for that.
>>
>>-josh
>
>How did you accomplish this?? did you save away system stuff?? ~30K
>Plus if you save away this system, stuff, does it end up crippling the
>OS in anyway, that would not normally happen? for example, does it
>stop
>you from being able to read and write to variable space, etc??
save $c000-$d748 in a temp var, should save fps&ops (that's why it was
only NEARLY complete)
you can't use floating point or ti's interrupts, only simple things. you
can access the vat yourself. i had a simple routine to do multipage ram
copies using the rom swap area, so you can access variables with that.
oh, you couldn't delete variables, but that could be fixed.
-josh
___________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com/getjuno.html
or call Juno at (800) 654-JUNO [654-5866]