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Krill
Registered: Apr 2002
Posts: 2839 |
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! =) |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting ShadowThat's why my answer when someone makes suggestion on anything I code "But couldn't thing X be in the sideborder?" the answer is always a resolute "NO!" :) Too lame or lazy, in other words. :)
I think setting up a CIA timer counting 63 cycles once, then querying that after VIC raster interrupts and having a little delay slide isn't really that much hassle. Especially since you can easily re-use that piece of code. |
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Dwangi
Registered: Dec 2001
Posts: 129 |
Maybe not an answer to the original question.
But I miss the Z-register. |
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Copyfault
Registered: Dec 2001
Posts: 466 |
Another what-if idea: grouping CSEL (not RSEL, mind!) and the YSCROLL-bits together in one VIC-II-control register would sometimes help to do badline- and sideborder-stuff in one go. |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting CopyfaultAnother what-if idea: grouping CSEL (not RSEL, mind!) and the YSCROLL-bits together in one VIC-II-control register would sometimes help to do badline- and sideborder-stuff in one go. Just have a global border-disable bit as Oswald suggested, and be done with it. :) |
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Copyfault
Registered: Dec 2001
Posts: 466 |
Quoting KrillQuoting CopyfaultAnother what-if idea: grouping CSEL (not RSEL, mind!) and the YSCROLL-bits together in one VIC-II-control register would sometimes help to do badline- and sideborder-stuff in one go. Just have a global border-disable bit as Oswald suggested, and be done with it. :) Global border-disable flag is maybe the most steroidal what-if-scenario :)
But grouping CSEL and YSCROLL is not the same and may offer other things, like: opening the sideborder and repeating the textline (and supressing badlines in the following) \o/ |
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Krill
Registered: Apr 2002
Posts: 2839 |
Badline-disable bit, then! =) |
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chatGPZ
Registered: Dec 2001
Posts: 11107 |
Hungarians suggesting global border disable. Mind: blown |
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Count Zero
Registered: Jan 2003
Posts: 1821 |
Krill is already on a maker track and just collecting further suggestions? Much here sounds like you guys want some Amiga500 at 1MHz ... or a DTV or so? :) |
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Codetsu
Registered: Feb 2017
Posts: 3 |
jep DTV have all that and more
no dreams it's here ready to code |
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Krill
Registered: Apr 2002
Posts: 2839 |
Quoting Count ZeroKrill is already on a maker track and just collecting further suggestions? Much here sounds like you guys want some Amiga500 at 1MHz ... or a DTV or so? :) No, this is just idle musing.
Retro ≠ Vintage,
DTV ≠ C-64. |
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