Re: 6502, 6510 tri-state

From: silverdr_at_wfmh.org.pl
Date: Fri, 30 Nov 2018 16:45:17 +0100
Message-Id: <60546979-D2B0-4EF2-B7E2-76B48C03B248@wfmh.org.pl>
> On 2018-11-30, at 16:10, groepaz@gmx.net wrote:
> 
>>> Does this happen all the time, regardless of whether the VIC is "blanked"
>>> (bit 4 of SCROLY if memory serves)?
>> IIRC VIC always uses the second half of the cycles. [...] And naturally the
>> refresh cycles need to be done, but they don't steal cycles. (See BA.)

Yeah, but even if they don't steal cycles, they still need to touch address bus... bummer.

>> Sprites are fetched
>> even when the screen is blanked and steal cycles.
> "screen is blanked" and "sprites are visible" are even independent things, ie 
> you can blank the screen (VIC generates no badlines) but still display 
> sprites.

How is that? How do you get visible sprites on a blanked screen?

-- 
SD! - http://e4aws.silverdr.com/
Received on 2018-11-30 17:00:33

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