sewage - bug fix for second sight

[tsetse@trance.helix.net (tsetse)]

> In article <3tk121$8cv@scipio.cyberstore.ca> you write:
> >Maintenance Update: This version has been updated to work with
> >Second Sight. A bug somewhere resulted in the super-hires mode
> >not getting turned on on the Second Sight card.
>
>       A bug "somewhere"?
>       could you please be more specific?  Why does it work on real hardware
> but not with the Second Sight card?
>       This could help other people, but also may show a bug in the Second
> Sight???  It should be mirroring hardware EXACTLY.

more details follow here. i think my original description was eaten
somewhere along the line.

> --
> unknown@apple.com             Apple II Forever
> These opinions are mine, not Apple's.

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 can explain more just what my code does if it'll help to identify
what's going on.

for reference, i'm using a zipGS 9/64. my second sight appears to be
an 18MHz version.

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.

--
It is not possible that the possible and the   |    tsetse@helix.net
impossible are both possible  - Babble 123     |  +oO      Vancouver.CA