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The original VIC-II with only a few pins attached for CAS/ RAS/
controller. (Look Maw no pins) I have a sram attached to the c64 bus
and have run it without the VIC , but I don't have a master clock that
will divide down correctly for the cpu and I get glitches in programs.
Hacking away! Where do I go from here <Click>
<http://www.geocities.com/cm_easy/Vic-iii--modes.html>
The front view of the interface between the c64 and the video card. The
video is now totally asyncronous and the C64 can free run at any speed
with the old VIC reemoved. But can be set to emulate syncronous
timming.
It's geos compatible!!
I've loaded up the sprite x/y size register to demonstrate the scalable
sprites upto 256x256 pixels. If you look close you can see that they
don't need to be rectangular anymore. Thanks Bill!
The sprite controller has no data fetch circuitry yet, because I want
to take advantage of the burst modes in the SDRAM. All sprites show up
as their respective colored solid blocks. They do have the priority set
working and maybe changable in the future.
I've had some success with translucent sprites and may show up in the
final product.
The timming is very close to the Original VIC II and can even play
demo's with raster scrolls / bars (can also be toggled 60/50hz mode).
It's fun to turn off bad lines emulation and watch what happens.
I just about fell out of my chair when I saw the ready for the first
time. This is a good example of the "regular scan mode" no
scandoubling.
I have also added a register to flip cells H/V, or the entire screen
H/V. This could be usefull for projection or VR goggles.
Here is to all the sceptics who felt they needed to write those nasty
emails! Hah!
Scan doubled modes can be one of four intensities on every other line.
I can't wait to see what the hackers will do with this.
I've greatly reduced the part count since the beginning of the project
which should keep the cost down.
That big chip in the center has been slowly assimilating the C64 step
by step. and now includes the VIC, PLA and most of the one CIA.. I
have the cpu mounted on the underside of the motherboard waiting to be
removed and replace with the internal one. Do I here C64 PDA?
The VIC-II Modes
1
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