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Forums > C64 Coding > 1541 Routines
2006-11-23 15:28
Codey

Registered: Oct 2005
Posts: 79
1541 Routines

What's the most impressive 1541 routines you've seen other than for loading? Some routines I recall are turning the led on and off in sync with the music, fading the led in and out, and bumping the head to play music from the drive (this had to contribute to many mis-aligned 1541s!)
 
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2022-05-10 20:43
Krill

Registered: Apr 2002
Posts: 2821
Quoting Copyfault
I think there was a fractal generator
[...]
Either way, it's not a demo!
Pray tell, why is it not a demo? =)
2022-05-10 22:44
Copyfault

Registered: Dec 2001
Posts: 466
Quoting Krill
Quoting Copyfault
I think there was a fractal generator
[...]
Either way, it's not a demo!
Pray tell, why is it not a demo? =)
I keep my hands off the territory of definitions on csdb. Better leave it to the mods ;)
2022-05-10 23:15
Krill

Registered: Apr 2002
Posts: 2821
To quote a demo scener i keep in high regard:
"julia fractals are never nice (slow or fast)... they're ugly iterating blobs of nothingness, same goes for mandelbrots... It's debugging stuff for mathematicians, not eyecandy"

... and they serve no purpose, apart from showing "oh yeah, i can do that!" =)

So, if there's anything qualifying for "demo", it's fractal generators. =D
2022-05-11 12:39
Martin Piper

Registered: Nov 2007
Posts: 631
Quote: To quote a demo scener i keep in high regard:
"julia fractals are never nice (slow or fast)... they're ugly iterating blobs of nothingness, same goes for mandelbrots... It's debugging stuff for mathematicians, not eyecandy"

... and they serve no purpose, apart from showing "oh yeah, i can do that!" =)

So, if there's anything qualifying for "demo", it's fractal generators. =D


Umm yeah, a fractal routine, especially one that is novel and uses one or more 1541s, would definitely be a "demo".
2022-05-11 16:23
Mirage

Registered: Jan 2003
Posts: 113
Quote: To quote a demo scener i keep in high regard:
"julia fractals are never nice (slow or fast)... they're ugly iterating blobs of nothingness, same goes for mandelbrots... It's debugging stuff for mathematicians, not eyecandy"

... and they serve no purpose, apart from showing "oh yeah, i can do that!" =)

So, if there's anything qualifying for "demo", it's fractal generators. =D


They still are! :)
2022-08-01 10:39
Krill

Registered: Apr 2002
Posts: 2821
Amanita (80%) - vector objects part on 2nd side.
2022-08-01 22:52
Copyfault

Registered: Dec 2001
Posts: 466
Quoting Krill
To quote a demo scener i keep in high regard:
"julia fractals are never nice (slow or fast)... they're ugly iterating blobs of nothingness, same goes for mandelbrots... It's debugging stuff for mathematicians, not eyecandy"

... and they serve no purpose, apart from showing "oh yeah, i can do that!" =)

So, if there's anything qualifying for "demo", it's fractal generators. =D
Meanwhile I found this link: https://www.c64-wiki.de/wiki/Mandelbrot-Construction-Set (sorry for German language used in the linked page)

The tool(!) is capable of handling only one drive, not several drives like I had in mind. But still, the program doesn't feel like a demo to me, it's rather a utility.
2022-08-02 08:02
deetsay

Registered: Aug 2005
Posts: 36
Do loaders generally (...or any loader) have support or room left for 1541 code, or do you always trash the loader and then run the "loader installer" again afterwards?
2022-08-02 08:41
Krill

Registered: Apr 2002
Posts: 2821
Quoting deetsay
Do loaders generally (...or any loader) have support or room left for 1541 code, or do you always trash the loader and then run the "loader installer" again afterwards?
It's the latter, but in a more refined form these days. :)
.struct drivecode
            entry  .word; drive
            to     .word; drive
            length .word; bytes
            from   .word; host
.endstruct

.struct swapparams
            buffer      .word; $0800 bytes for swapped loader drive code

            drivecode41 .tag drivecode
    .if ONLY_1541_AND_COMPATIBLE = 0
            drivecode71 .tag drivecode
            drivecode81 .tag drivecode
    .endif; ONLY_1541_AND_COMPATIBLE = 0
.endstruct

.import swapdrvcod
.import restoreldr

; Execute custom code in the drive, buffer loader code on host side before
; in:  x/y - x: lo, y: hi of swapparams structure
; out: c   - set on error
;      a   - status
.macro SWAP_DRIVECODE params
            ldx #<(params)
            ldy #>(params)
            jsr swapdrvcod
.endmacro

; Restore drive-side loader code
; in:  nothing
; out: undefined
.macro RESTORE_LOADER
            jsr restoreldr
.endmacro
2023-06-07 10:17
Krill

Registered: Apr 2002
Posts: 2821
Boo! - drive-side co-processing.
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