| From: TLC (all posts)
Date: 1998-05-25
Subject: Re: Various...
|
Hi!
> PALS, NTSCS, SECAMS A/B, SPALS, and HDTVS!
> I messed a bit (or a byte) with $ff1d... It resulted in a black vertical
> bar which crossed the entire screen. It was about 2 chars wide. It also
> moved the text "window" 2 chars to the left. (I did this on a monochrome
> screen, so I can't say anything about COLORS.) Was it a dislocated
> horizontal retrace or what?
It may have been an extra horizontal retrace instead of a dislocated one.
Moving the HR in one line means that TV tries to get synchronised again,
so you'd see a wrapped/bent screen instead.
Did you say '$ff1d'? ...I mean, not $ff1e?
If so, could you send the source code to the list, I'd be interested how to achieve such an effect.
Are you remember Dynamix/TCFS ? It was a C64 originated game, re-written on Plus/4 by TCFS with an intro also written by him. This intro contained an effect like you mentioned. It was the first ever removed sideborder effect I remember, but you know, it also had that black vertical bar all accross the screen. ...I never disassembled it, nor did I play with such an effect. Since in 1990 it wasn't very common to play with
$ff1e effects and also not at all to use cycle exact timing, I guess TCFS should have used something else than $ff1e.
Levente
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