Search found 1060 matches

by groepaz
Mon Feb 05, 2024 3:30 pm
Forum: Emulation and Cross Development
Topic: VICE White Noise Bug?
Replies: 12
Views: 341

Re: VICE White Noise Bug?

you shouldnt have to wait, it takes 16 machine cycles to fill the lfsr with 1 bits: enabled:0 bit3:0 bit12:0 bit14:0 bit15:0 gate1:0 gate2:0 gate3:1 gate4:1 lfsr:0001 enabled:0 bit3:0 bit12:0 bit14:0 bit15:0 gate1:0 gate2:0 gate3:1 gate4:1 lfsr:0003 enabled:0 bit3:0 bit12:0 bit14:0 bit15:0 gate1:0 g...
by groepaz
Mon Feb 05, 2024 3:23 pm
Forum: Emulation and Cross Development
Topic: VICE White Noise Bug?
Replies: 12
Views: 341

Re: VICE White Noise Bug?

Sorry, i interpreted wrong what you wrote...

yes it requires "enabled" being zero (for some cycles) to start. which it is after reset.
by groepaz
Mon Feb 05, 2024 3:16 pm
Forum: Emulation and Cross Development
Topic: VICE White Noise Bug?
Replies: 12
Views: 341

Re: VICE White Noise Bug?

1 AND 1 is 1, not 0
by groepaz
Mon Feb 05, 2024 3:10 pm
Forum: Emulation and Cross Development
Topic: VICE White Noise Bug?
Replies: 12
Views: 341

Re: VICE White Noise Bug?

bit 0 of gate4 is either 0 or 1 on each iteration, and ORed into the LFSR ... so thats how 1 bits go into the LFSR
by groepaz
Mon Feb 05, 2024 2:35 pm
Forum: Other Systems
Topic: Extremely Rare Ala Software game for C64 - Whiz Kid
Replies: 12
Views: 654

Re: Extremely Rare Ala Software game for C64 - Whiz Kid

It doesn't seem to work, unfortunately. When using the Audiotap program, for this game I selected "inverted waveform" like I would on vic-20 files. is that correct? It depends on your specific setup - but if it produces working vic20 taps for you, it should work the same for c64 please pos...
by groepaz
Mon Feb 05, 2024 1:11 pm
Forum: Emulation and Cross Development
Topic: VICE White Noise Bug?
Replies: 12
Views: 341

Re: VICE White Noise Bug?

What doesn't work though? (That it sounds different is quite expected - there should be a thread somewhere around here about the new reverse engineered LFSR) also the quoted code is missing some lines? it should be: int bit3 = (noise_LFSR >> 3) & 1; int bit12 = (noise_LFSR >> 12) & 1; int bi...
by groepaz
Sun Feb 04, 2024 10:15 am
Forum: Emulation and Cross Development
Topic: Multipaint VIC 20 support
Replies: 13
Views: 2524

Re: Multipaint VIC 20 support

Mmmh wouldn't something like charpad be more suited for the job? It already has all the needed features, i think
by groepaz
Wed Jan 31, 2024 6:35 pm
Forum: Emulation and Cross Development
Topic: Multipaint VIC 20 support
Replies: 13
Views: 2524

Re: Unknown Vic20 Screen Editor

It's not exactly VIC20 (only): http://multipaint.kameli.net
by groepaz
Sat Jan 27, 2024 3:49 am
Forum: Emulation and Cross Development
Topic: Keyboard Buffer and Ctrl/Shift/CBM etc
Replies: 20
Views: 899

Re: Keyboard Buffer and Ctrl/Shift/CBM etc

This should be fairly straight forward to implement.... you can ignore all the details about VIA if all you are after is keyboard input (just assume port 1 is all output, port 2 is all input). Then as you noticed, the logic is low-active (you will see that at many other places). One thing to conside...
by groepaz
Fri Jan 19, 2024 8:59 am
Forum: Hardware and Tech
Topic: Dark bands rolling down the screen
Replies: 3
Views: 368

Re: Dark bands rolling down the screen

Tried another PSU? (If they are rolling slowly - most certainly a power problem of some kind)
by groepaz
Tue Jan 16, 2024 8:55 am
Forum: Collecting and History
Topic: Documenting the unreleased/cancelled/prototype video game "Ice Palace"
Replies: 10
Views: 1239

Re: Documenting the unreleased/cancelled/prototype video game "Ice Palace"

Have been trying to do the same with GTK VICE 3.8 but I cannot find that option anymore and could not get the .bin to start easily. Maybe there is a good reason to remove support for these files, since they seem to have no starting-address, but this seems to break some software-downloads out there....
by groepaz
Mon Jan 15, 2024 11:20 am
Forum: Collecting and History
Topic: Documenting the unreleased/cancelled/prototype video game "Ice Palace"
Replies: 10
Views: 1239

Re: Documenting the unreleased/cancelled/prototype video game "Ice Palace"

Here is a snap shot for Vice vic20
... which apparently was made in a decades old VICE - and doesn't work in a recent one.

Making a .crt out of it would make a lot more sense :)
by groepaz
Wed Jan 10, 2024 9:18 am
Forum: Emulation and Cross Development
Topic: CBM prg Studio
Replies: 239
Views: 152254

Re: CBM prg Studio

Isn't it using the remote monitor protocol do it's stuff? In that case it should be totally possible to use the linux version of VICE - at least i don't see why not.
by groepaz
Fri Dec 15, 2023 10:39 am
Forum: Programming
Topic: Increasing the number of sound voices?
Replies: 4
Views: 2730

Re: Increasing the number of sound voices?

It works if the composition does mainly consist of fast alternating notes which are all of the same length - not as a generic technique that doubles the channels
by groepaz
Sat Dec 09, 2023 2:42 pm
Forum: General Topics
Topic: Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs
Replies: 4
Views: 2744

Re: Bugs & Quirks in the VIC-20 BASIC & KERNAL ROMs

It should be noted that most (if not all) of this is still broken in the C64 too :)