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Forums > C64 Coding > Holy Grails
2018-03-18 10:10
Krill

Registered: Apr 2002
Posts: 2980
Holy Grails

I've been wondering about them, with some having been finally discovered, others not yet, and some probably going to remain in the realm of the impossible forever.

I'm speaking of things like:
- 320x200x16 graphics without restrictions
- Crash-free all-direction hardware scrolling
- Digi replay of 8-bit samples at one register write per sample and without requiring cycle accuracy

on standard vanilla hardware, of course.

Some examples of discovered grails are:
- Cube rotating at 50 fps about 3 axes
- The 9th sprite (with some restrictions)
- On-the-fly standard GCR block read+decode+checksumming

As for definition, they all satisfy some measure of being perfect or optimal or being possible after all, with no further improvements required, possible or necessary. But i'm not so sure if that definition holds water with regard to some of the examples i listed. :D

The question is, what other Holy Grails are there, already discovered or still elusive?
What are your pet grails you've been chasing after for decades or have found eventually? :)
 
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2018-03-28 12:09
ptoing

Registered: Sep 2005
Posts: 271
That's pretty clever. Good stuff.
2018-03-28 12:17
ChristopherJam

Registered: Aug 2004
Posts: 1409
Thanks :)
2018-03-28 14:13
ptoing

Registered: Sep 2005
Posts: 271
I take it that the 2 mcol sprites of course use the same 2 fixed colours per line? So they would provide 4 colours total, to each line at most.
2018-03-28 15:55
ChristopherJam

Registered: Aug 2004
Posts: 1409
Correct. Each column has access to between five and eight sprite colours; here's a chart:
+----------+---------------+
|          |1 2 3 4 5 6 7 8|
+----------+---------------+
|  $d025   |X X X     X X X|
|  $d026   |X X X     X X X|
|  $d027   |X X X X X X    |
|  $d028   |X X X X X X    |
|  $d029   |X X X X X X    |
|  $d02a   |    X X X X X X|
|  $d02b   |    X X X X X X|
|  $d02c   |X X X          |
|  $d02d   |          X X X|
+----------+---------------+
2018-03-28 16:01
Krill

Registered: Apr 2002
Posts: 2980
*** ChristopherJam invokes Godwin's Law
*** Topic closed
2018-03-28 16:04
JackAsser

Registered: Jun 2002
Posts: 2014
Quote: *** ChristopherJam invokes Godwin's Law
*** Topic closed


ROFL!
2018-03-28 16:10
ChristopherJam

Registered: Aug 2004
Posts: 1409
HAHAHAHAHA

Dammit, I did think about swapping the last two lines (more of a diagonal stripe that way), but wanted to stay faithful to the allocation Reutastic actually usedÂ…
2018-03-28 16:15
CreaMD

Registered: Dec 2001
Posts: 3057
"rocket science", "easy as d021". Yeah "After wit is everybody's wit."
2018-03-28 17:38
Golara
Account closed

Registered: Jan 2018
Posts: 212
I see every post of Christopher as <message ignored>. What does it mean ?
2018-03-28 18:55
algorithm

Registered: May 2002
Posts: 705
You accidently clicked on "ignore all posts from this user". You can revert back to previous somewhere in userpage I think
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