Re: vector programming...

I wrote a small vector data 'browser' called Aview that should work on Tempest. It is at
http://www.gamearchive.com/video/general/hacking/programs/avrv/index.html

If anyone wants the source, let me know.

Im not too sure about the 'mystery' opcode tho. In major havoc the vector ROM
'rts' always returns. I haven't messed with tempest but it has the same state
machine PROM as SD,G,BW,MH so they shouldn't be any different?
  jess

Clay Cowgill wrote:
>
> > Do you have anything that gives an insight on how the EEPROM functions
> > work for Tempest? The Mathbox?
> >
> I can help out on the EEPROM. I actually mapped out what all goes where...
> I'll look for the doc at home. (I had to figure it out to leech some EEPROM
> space for the V-breakout highscore in the Tempest Multigame.
>
> I have some sample code for reading and writing to the EEPROM too if you
> want it...
>
> > Also, Clay Cowgill mentioned a strange AVG routine that was not documented
> > at: http://www.kfu.com/~nsayer/games/vecops.txt . Anything you can add to
> > that document?
> >
> MAME seemed to goof up on some types of vector draws-- it read a high-bit as
> a sign instead of the MSB of the length. The thing I couldn't figure out
> from Jess' doc was some sort of implied subroutine call or something. The
> Atari vector ROMs used it-- I wrote a little vector disassembler based on
> Jess' info that automatically mapped the Tempest character ROMs (I suppose I
> should give you that too) and there were some routines that my disassembler
> would miss. It seemed as though a "return" wasn't always a return and
> sometimes it would automagically go to the next routine in VROM. Weird
> stuff.)
>
> -Clay
Received on Mon Oct 4 17:55:00 1999