Nah, minimum is when there are no sprites and the screen is blanked, then you get none at all, AFAIK. Even with the screen not blanked, software can still delay bad lines by arbitrary amounts. > -----Original Message----- > From: ncoplin@orbeng.com [mailto:ncoplin@orbeng.com] > Sent: 03 May 2001 11:36 > To: cbm-hackers@dot.tml.hut.fi > Subject: minimum VIC bad-line frequency?? > > > Hi All, > > I'm trying to figure out if I can use the BA signal as a > "clock" if I can > rely on it going low often enough. The fact that the frequency varies > dependent upon what is on the screen doesn't worry me for > now, it is the > minimum that is important for me. > > After scanning the vic.txt document I'm still not too sure of > the answer. > The minimum is when no sprites are displayed. Therefore is there 25 > "character" fetches per screen (every 8 visible rasters), > which for a 50Hz > display equates to a minimum of 1.25kHz? > > Or: 312 rasters (PAL) x 50Hz, therefore 15.6kHz > > Regards, > Nick > > > PLEASE TAKE NOTE: > > The contents of this email (including any attachments) may be > privileged and confidential. Any unauthorised use of the contents > is expressly prohibited. If you have received this email in error, > please advise us immediately (you can contact us by telephone > on +61 8 9441 2311 by reverse charge) and then permanently > delete this email together with any attachments. We appreciate > your co-operation. > > Whilst Orbital endeavours to take reasonable care to ensure > that this email and any attachments are free from viruses or other > defects, Orbital does not represent or warrant that such is explicitly > the case > > (C) 2000: Orbital Engine Company (Australia) PTY LTD and its > affiliates > > - > This message was sent through the cbm-hackers mailing list. > To unsubscribe: echo unsubscribe | mail > cbm-hackers-request@dot.tml.hut.fi. > -Virus scanned and cleared ok - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail cbm-hackers-request@dot.tml.hut.fi.
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