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Aomeba
Registered: Jul 2005
Posts: 22 |
Dekadence loader & disc side change (1541u)
Hey everyone,
Siesta is working on a new demo for X2016, and the side A is 100% finished except that we're having trouble mounting side B with 1541u. Adder, our coder, is using the Dekadence Loader
What's the common protocol for these automatic disc side detects with 1541u?
We've been out for 20 years so please teach us.. |
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Burglar
Registered: Dec 2004
Posts: 1101 |
soundemon is around, is he not? I'm sure he'll help out here |
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Adder
Registered: Mar 2016
Posts: 14 |
I can prove that it is not on the id's.
when i try to mount floppy 2 times it doesn't make a difference. |
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Burglar
Registered: Dec 2004
Posts: 1101 |
one big tip, make sure side 2 also has a bootfile, so the demo can be started there as well in case the flipdisk fails. |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
also keep in mind that disk changing via the menu _IS_ prone to errors and will randomly fail (or not so randomly if you are for example using some timer-irq driven stuff in the turn disk part).
first of all make sure it works on a real drive - if it then doesnt work on 1541u, most likely its not your fault. |
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Adder
Registered: Mar 2016
Posts: 14 |
@Burglar
we have a .d64 with running file
@Groepaz
i believe that the demo runs on real disk..
there is a flip disc and the loader doesn't changes |
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Adder
Registered: Mar 2016
Posts: 14 |
@Burglar.. we played with the idea to make side 2 runnable.. it will be so
Thanks for that info .. may it helps at the competition too |
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Mixer
Registered: Apr 2008
Posts: 452 |
Afaik the dkd loader does not have a flip disk detection. It does not have special command for reloading the directory, but there is a reset command, if I recall it correctly.
Loader was used for example in Vicious Sid demo. The turn disk part asks to flip disk and press space and then it starts from side 2. |
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Adder
Registered: Mar 2016
Posts: 14 |
hi @Mixer no problem with detection.. we have the "Reset" lda#$ff , jsr $0100
after that the loader didn't come around with reading a file or init loader.
there must be a way for reseting the 1541 |
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Mixer
Registered: Apr 2008
Posts: 452 |
Looked at the dkdloader code and the "reset", aka. the lda #$ff or any number with 8th bit up in accu while calling the loader should cause the loader to call the 1541 hardware reset vector JMP ($FFFC), which should reset the 1541 to its basic state. So, after that one should be able to do kernel 1541 stuff as usual or reupload the loader.
Whether it works with 1541u or emulation is another matter. |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
one thing to consider at this point: you must wait for about 1 or 2 seconds after resetting the drive - if you try to transfer anything during that period the kernal IEC routines will lock up |
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