Thanks, a lot Eckhard!
On Thu, 29 Jun 2000, Eckhard Stolberg wrote:
> >But I need to run another test. I need to know if INPT5 can be
> >read at the following addresses: $1D, $2D, $3D, $4D
>
> I tried to read INPT4 at $1C, $2C, $3C and $4C on my 7800 in 2600 mode
> and all of the adresses work. I hope this answers your question anyway.
Yep, that answers it.
> >I also want to verify that VSYNC is available at $40.
>
> Yes that works too. Infact Tigervision accesses all TIA registers at
> addresses between $40 and $7F, because the addresses below $40 trigger the
> bankswitching mechanism. They use only address $3F for switching banks
> though, because that address isn't used by the TIA as well.
Ok, I had forgotten this. Yay! I think that does it for the TIA, and the
ROM. Now I just need to work on the RIOT. The main map is complete...I'm
just working on a nice RIOT document as an appendix.
For those interested in the memory map project, take a look at the the URL
below. This will eventually become part of a (somewhat massive) documentation
archive for VCS hardware. The software stuff is pretty well documented, if
difficult to find at times. I just bought a HP 6300CSE scanner today, so
I'll be scanning in various magazine articles, data sheets, schematics, etc
and adding them to the archive as time permits. Eventually, it'll have a
more useful and organized format....first I want the files there. ;)
Anyway, take a look at the files there, and please send me your bug reports,
suggestions, or just random comments on the memory docs. There are 2 main
files there, please let me know which is more useful. I'll be compressing
the listing to fewer lines as time permits.
http://www.mit.edu/~ecwilkso/VCS_hardware
Thanks,
-Chris
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