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Re: sewage - bug fix for second sight
- Subject: Re: sewage - bug fix for second sight
- From: bazyar@hypermall.com (Jawaid Bazyar)
- Date: 1995/07/11
- Newsgroups: comp.sys.apple2
- Organization: SuperNet Inc. (303)-296-8202 Denver Colorado
- References: <3tu4ui$ue@monolith.cyberstore.ca>
tsetse (tsetse@trance.helix.net) wrote:
: i wish i knew enough to identify exactly why the change was necessary.
: i am puzzled myself.
: my code uses a LDA #$C1
: STA $E1C029
: to turn on super-hires mode. but as to why the second sight card was
: not seeing the softswitch access, i do not know. by typing the same
: thing directly into the monitor (ok, STA C029), second sight WOULD
: display the expected sgr screen. changing the code to do the
: LDA/STA twice in a row did however generate the desired results.
: but i don't understand why!!!! note, i initially changed all
: softswitch references from absolute to absolute long just in case
: it had to do with bank 0 being shadowed to bank e0/e1 but that
: change had no effect.
I know why this is occurring, and we'll fix the problem for the
next ROM/GAL release. The problem causes other odd behavior as well.
: also, i have seen so far that the second sight shadowing isn't
: perfect. i see the odd anomoly, usually as a run of pixels that are
: not correct.
This is a bug in handling multiple palettes on a scanline, and has
been fixed and will be in the next ROM/GAL release as well. :-)
--
Jawaid Bazyar | Like UNIX? Like your Apple IIGS? Then ask
Procyon, Inc. | me about GNO/ME for the Apple IIgs!
bazyar@hypermall.com | P.O Box 620334 (Sequential: 303-666-4549)
--The Future is Now!-- | Littleton, CO 80162-0334 (303) 781-3273