Re: Tech ?s about apple2e

[agk@bbs.ausom.oz.au (Andrew Kingdom)]

vimx <vimx@delphi.com> writes:

>1. I remember something about double HIRES on a 80 column card. How do you
>  turn it on. ? Poking the card causes strange display effects, but often
>  jams up the cpu. Also, how can you access the other 64k with poke & peek?
>2. What is sweet16?
>3. I think I remember something about a modified DOS 3.3 hacked so it could
>  write on write protected disks. Is this possible? Also, how did they hack
>  DOS so that it could load binary files a lot quicker?
>4. Does the mini-assembler call integer basic or just the monitor?
>These sound like very old qustions because they are. Still would like to
>know though.
>Bill -- VIMX
1) turn on DHR by doing PR#3 : HGR: poke 49246,0
You can't really access the whole 64k simply with peeks and pokes,
but you can access text/hires areas by using POKE -16299,0:
POKE address,value:poke-16300,0
2) Sweet16 was a simple 16 bit simulator which Steve Wozniak
wrote for the II early on.
3. Don't do it!
3b) this was mostly done by loading of disk directly to the target memory
rather than having one or two intermediate buffering stages.
4) Depends if you're running under INTEGERBASIC or if using
the one which is built in ROM.
(For IIc users who don't have the mini-assem in their machines,
I've written one which resides in main RAM. May work on IIe, but
untested. lemme know if anyone interested)

hope this helps.
Andrew K (agk@ausom.oz.au  or agk@bbs.ausom.oz.au)
#8^)