Re: more VIC-II musings

From: Frank Wolf <webmaster_at_frank-wolf.org>
Date: Thu, 16 Jan 2020 17:25:52 +0100
Message-ID: <fbb88172-cd12-bcc4-1dec-9d866ad32063_at_frank-wolf.org>
Just to entertain the curious ones:

https://is.gd/lZ4IZn

Some side-by-side comparison of the beast. :-)


On 13/01/2020 21:04, groepaz_at_gmx.net wrote:
> Am Montag, 13. Januar 2020, 20:55:50 CET schrieb Michiel Boland:
>> Hi. Not sure if this has been mentioned already, but there is a bug in the
>> VIC-II chip where it will simultaneously shift a sprite shift register and
>> attempt to load it with a new value at the same time, for the duration of
>> one pixel. This introduces some interesting phase-of-the-moon bugs in
>> combination with multi-color mode. At least, that what I think is going on.
>>
>> https://youtu.be/BN8LQz7aBLg
>>
>> As an aside, there appears to be some work here and there of people who have
>> reverse-engineered, or have tried to reverse engineer the VIC-II chip based
>> off of die shots. But there does not appear to be anything definitive
>> online (a la visual6502), or it was once there but has since disappeared.
>> Or maybe I am looking in the wrong places. What is there to be found
>> regarding this? (So I don't have to reinvent the wheel. :)
> i think the most work was done by tlr and nojoopa when x64sc was implemented.
> i dont think any details from die-shot reversing where posted anywhere. (i am
> not aware of any such work either... except for one guy (androsid) on the
> german forum64 - he seems to be working on it, but didnt post any details yet
> either)
>
>
> --
>
> http://hitmen.eu                 http://ar.pokefinder.org
> http://vice-emu.sourceforge.net  http://magicdisk.untergrund.net
>
> I do not believe in a personal God and I have never denied this but have
> expressed it clearly.
> <Albert Einstein>
>
>
>
>
>
>
Received on 2020-05-30 00:20:11

Archive generated by hypermail 2.3.0.