Replies: 7 comments 11 replies
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The only reason for the playback rate was to keep the menu code simple (1 sample per rasterline, except for bad lines). In principle the RAD can write 1 sample per clock cycle. Maybe I'll allow a bit higher sample rates (but non-constant, otherwise the menu code becomes ugly). So far I didn't plan to include a WAV-player (btw the Sidekick64 does have one, including playback up to 48kHz stereo!). BRTV: how many movie files are there? RetroArch is a frontend requiring a full OS -- this won't work as the RAD runs baremetal (no OS). You can imagine that emulation of other platforms is possible (see RAD Doom), but someone has to port it to baremetal code ;-) |
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So not easy to port the Sidekick wav-player over? Just on the RAD DOOM port? How was this done then? You must have compiled the code somehow.... |
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It would be possible to port the Sidekick64-player, but writing it differently for the RAD would be really easy :-) but I have to admit that this is not very high on my list of things that I'd like to try out. Thanks for the BRTV-link, maybe I'll add this. It actually only requires code that mounts the REU image plus autoloads the player (same as for NUVIEs). Doom is compiled to bare metal code. That's DoomGeneric with minimal changes, so it can load what DoomGeneric can handle (and there are some parts in the code about WADs, but I didn't check). Memory is not an issue, I mean the RPi has >= 512MB ;-) My "goal" of RAD-Doom was to have a proof-of-concept of running some program with graphics and sound output on the C64, Doom was the instrument. |
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is it possible to do some kind of youtube player? |
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well, in principle it would be easy to decode videos (all the code for playing is in RAD-Doom). However, one would need to download/buffer the videos (afaik that's not welcomed from that source...). The Nuvie-format is made for PAL-machines, it's nothing I could do from the RAD side (RAD uses the standard Nuvie-player-PRG and just emulates a REU). There is a Koala-video-format that also runs on NTSC if that is of interest!? |
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I wasnt aware of the koala video format. that should definitely be included along side the nuvie player. |
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here some crazy non scientist ideas from my rabbit's hat:
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Hi, a diagnostic tool is something that I had on my list since my first project (the Sidekick64) -- unfortunately there were always other things I wanted to try before ;-) The datasette will be write-only then, afaik the audio jack is output only :-) I haven't looked into something like this, but if there's a baremetal emulator, the RAD-Doom framework could be used to run it on the C64. For Sonic: not sure about legal implications... |
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...about diagnostic and BMC64; I can successfull watch intro of RAD-DOOM with proper graphic and sound (with a working sid) even without the two 4464 bank of ram (or with bad ram in place) while a dead test would only give a blinking screen. (I cant go any further than intro because I've desoldered CIAS and havent found time to socket and put back them in place). I've search over the web if someone else was empyric like me to use a REU device to skip memory test of pcb and get some screen; I suppose so that a BMC64 on RAD device with CIAS could bring back many C64 without loosing a screw ;-) note1: saddly RAD regular reu+prg launcher realease, on that broken pcb, starts with correct grayscaled borders and music but I've garbage garbage like in dead test (horizontal lines and debris) so finger crossed for superPla that I want to avoid the replacement :-D |
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is a mp3 player possible? |
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A mp3-file could be decompressed and played like the menu-music (or with dual-SID, ... support). So yes, this is possible. I think mp3 is not covered by patents anymore...? |
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I had wondered... If the raspberry pi (running Linux or bmc64) can emulate a 64 with Vice, would it be possible to allow the emulated Vice to send and recieve to the real hardware. There's your Scpu emulation. Just send the video back to the VIC-II. Vice can run headless (no ui) |
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running anything other OS than bare metal (eg Linux etc) will destroy the ability of the Pi to communicate with C64 because of timing delays, so no, I don't think that's possible. Except maybe if there is an emulator that run bare metal it can then be "constructed" to run via RAD-DOOM framework |
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I think it depends to which part of the real hardware you want to communicate. Reading keyboards, joysticks etc. is non time-critical, while loading from a real-floppy drive at the serial port is probably more tricky. (fortunately the expansion port is blocked once you put a RAD in, otherwise this would be even more critical). Ideally that emulator would run one cycle after another (fast enough). In any case, once you run an OS, you're pretty screwed as there are too many things going on (like thousands of interrupts per second which make reliable communication impossible (as StmLord said). In fact, my very first experiments prior to Sidekick64 used a RPi with Raspbian to in-place-emulate a SID, and communication was always unstable because of that. |
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the RAD will be support another file format like crt o d64-d81? |
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The hardware itself is not capable of directly emulating all kinds of cartridges. This requires also emulating the CPU. While this code exists, I didn't find the time yet to make this ready for release. D64: there's a huge difference of supporting the file format (e.g. via kernal vectors) or real IEC emulation. Again, the latter is something the hardware is not made for. |
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Hi, |
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Hi, I was thinking about this since years (co-processor features could also be implemented into Sidekick64, SIDKick etc). My feeling is that there is little acceptance for such things as it would not emulate "hardware that existed back in the days". However, if someone wants to do some demo/game and solve the chicken and egg problem, the features would be easy to integrate. |
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Just got my RAD to use with my RPi 3B+ not so long ago and having a good play.
VERY impressive piece of kit that lets the Pi really take over the C64.
Had a good play with changing the RAD menu music.
Only thing I wish existed was a WAV "jukebox" player in the firmware. I could create a directory of WAVs and easily switch between music files I've converted from the menu rather than having to overwrite the default music.wav file to hear the sample play.
"Bad Reception TV" format REU loading and booting the player works well.
https://csdb.dk/release/?id=160140
Getting BRTV support built in would be a nice firmware features alongside nuvie.
I note that the BRTV sounds samples can hit higher quality sound rates (44100Hz), which is more than the RAD menu wav player.
Check out the "Personal Jesus 35KHz" BRTV REU image to hear what I mean. I even have a 44100Hz version which I downloaded from somewhere:
https://www.dropbox.com/sh/5qqxovv6y7osidc/AABeYf6PBwiL5Eqj7pnIImRZa?dl=0
Would it be possible to improve the WAV player in the menu to accept higher than 15600Hz bitrates and get better quality?
Is there anything technically holding it back? Is it only because the RAD can stream to the SID at 22Khz tops?
I did leave some converted wavs as 44100Hz and they went vveeeeeerrrryyyy ssssllllloooowwww! So bit rate seems to be more of a speed setting than a quality setting. But then, perhaps I'm comparing apples to oranges.
Finally if I had a dream, it would be for RAD to drive a version of RetroArch! Open the C64 up to "emulating" pretty much every other computer and arcade system!
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