Log inRegister an accountBrowse CSDbHelp & documentationFacts & StatisticsThe forumsAvailable RSS-feeds on CSDbSupport CSDb Commodore 64 Scene Database
You are not logged in - nap
CSDb User Forums


Forums > C64 Coding > Alt-history no-cost design changes with great value
2021-05-01 22:49
Krill

Registered: Apr 2002
Posts: 2804
Alt-history no-cost design changes with great value

Which things in the C-64 could have been implemented or connected differently without conceivable extra cost, for coding advantages?

Thinking of things like shuffling the chip register bits like VIC's $d011 and $d016 differently (such that some effects can be achieved with fewer register writes or less twiddling).
Or putting some IO register to $01 (and move the memory configuration somewhere else, somehow).
Maybe also having different PLA memory configurations (not necessarily more).
Or connecting external signals to the CIA port pins in a different order.

Discuss! =)
 
... 74 posts hidden. Click here to view all posts....
 
2021-06-09 13:08
ChristopherJam

Registered: Aug 2004
Posts: 1359
Cheers, Oswald.

Well, for vertical fill you still need two writes if you're going to get a pattern fill - and tracking the pattern phase for that one hurt my brain too much haha.

Per pixel HW fill would be fine if you just want solid colour, but why not go the extra six bits and get patterns :)

The extra cost of the second write is fairly low compared to calculating the X offset anyway.
Previous - 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 - Next
RefreshSubscribe to this thread:

You need to be logged in to post in the forum.

Search the forum:
Search   for   in  
All times are CET.
Search CSDb
Advanced
Users Online
MCM/ONSLAUGHT
iAN CooG/HVSC
zscs
Exile/Anubis
Sumaleth/Pearl
CopAss/Leader
Murphy/Exceed
jmin
Acidchild/Padua
psych
Guests online: 305
Top Demos
1 Next Level  (9.8)
2 Mojo  (9.7)
3 Coma Light 13  (9.7)
4 Edge of Disgrace  (9.6)
5 No Bounds  (9.6)
6 Comaland 100%  (9.6)
7 Uncensored  (9.6)
8 The Ghost  (9.6)
9 Wonderland XIV  (9.6)
10 Bromance  (9.6)
Top onefile Demos
1 Party Elk 2  (9.7)
2 Cubic Dream  (9.6)
3 Copper Booze  (9.5)
4 Rainbow Connection  (9.5)
5 TRSAC, Gabber & Pebe..  (9.5)
6 Onscreen 5k  (9.5)
7 Dawnfall V1.1  (9.5)
8 Quadrants  (9.5)
9 Daah, Those Acid Pil..  (9.5)
10 Birth of a Flower  (9.5)
Top Groups
1 Booze Design  (9.3)
2 Nostalgia  (9.3)
3 Oxyron  (9.3)
4 Censor Design  (9.3)
5 Crest  (9.3)
Top Diskmag Editors
1 Jazzcat  (9.4)
2 Magic  (9.4)
3 hedning  (9.2)
4 Newscopy  (9.1)
5 Elwix  (9.1)

Home - Disclaimer
Copyright © No Name 2001-2024
Page generated in: 0.034 sec.