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The 1-Bit Forum → Posts by utz
I think I could hack something like it into the converter. What exactly should those 15 steps in E5x represent, though? E58 is no detune of course and then I guess E50 should represent -¼ tone and E5F should represent +¼ tone. I don't like the idea of having a lookup for this, so I'd prefer to have a formula in the form of
freq = freq_base + (E5x_param - 8) * something_somethingWooo MovieMovies1, long time no see! Fantastisk track, still rocking the beeper like a boss, I see 
Hi, after playing around with Archie in 1tracker a bit, I decided to modify the engine plugin a little to better suit my needs. Sharing the modded engine here in case someone else will find it useful.
The changes are:
- Applies half as much detune. x*2 detunes too much on an engine with 12-bit dividers, imo.
- Phase offsets are now log(x)-based. This is useful because it mirrors the relation between phase offset and volume, ie. we're mostly interested in values close to phase inversion.
Hi, FrankT pops in here once in a while, but not very often. I sent him a message, but I'm not sure I have his recent contacts. Otherwise, he also hangs out on https://spectrumcomputing.co.uk/forums/ every now and then.
My apologies Shiru, I'm super pressed on time rn so haven't had the chance to test these. Just judging from Tufty's test track (also heard it without EQ) though, QC24 at least sounds amazing. I think absolutely nailed the volume balance between tones and drums this time.
So Lee gave you only 900 bytes, but then had room for a speech sample scratches head. Well done though, mate
Team Qchan represent! Also still one of my favourite engines. Those envelopes are magic.
Also classic Tufty style at it's finest.
Oh yeah! This one goes deep.
I have some faint memories of The Invisible Man having written a custom driver for the TRS-80. I also have a pile of old music editors on my hd, don't think I ever actually tried any of them though 
Output: Bits 0-1: 00=0.85 Volts, 10=0.0 Volts, 01 = 0.46 Volts
So that thing actually has 3 volume levels! That could be interesting to explore. Though I wonder why the voltages are so low overall. Doesn't the Speccy output something like -5V?
Sigh... I'm still pissed about the whole story.
Some new beeps from teh h0ff:
https://www.pouet.net/prod.php?which=97217
I remember these ports making rounds a couple of years ago, though I can't remember either who did them. The problem is that none of these work on actual hardware, at least not without modifications to the board (including my 1k2b). An actual unmodded ZX81 will produce a loud static noise which drowns out any music played by the machine.
I think I have some appropriate material for this compo 
Regarding looping PWM samples, I've got an idea for a design that would be relatively cycle-efficient. We need to check for the end marker anyway, right? If we put a loop pointer immediately after the end marker, that loop pointer could either point to the end marker itself (effectively stopping sample playback) or to some arbitrary position in the sample (actual loop). The only caveat is that the encoder needs to ensure that 1) the phase is not accidentally inverted by the loop, 2) state is 0 at the end of the sample, and maybe 3) the length of the last half-cycle before the end is reduced by 1. This would rule out extending PWM half-cycle length beyond 255, but I think we can live with that since we can pitch down anyway.
A dedicated noise channel might also be interesting (with fake volume control through the duty cycle approach, otherwise it will overpower the sample channels), because noise is expensive when PWM sampled.
I'm thinking dedicated tone channels might not even be necessary since they can be "emulated" with PWM samples. Even simple chords should not be too expensive in terms of memory usage. Maybe 3 sample channels can be done instead? Don't know how feasible that would be in terms of overloading. The same applies to additional tone channels, of course. For example, I tried using some longer breakbeat samples in Squat. That almost completely drowned out the tone channels.
Thanks Detective Bushy I'm glad you're figuring out and sharing all these specifics.
Cheers guys! Great compo, lovely tracks from y'all. Hearing good old LSengine put a smile on my face.
I'm a bit surprised that Horseman scored comparatively low. I thought it was a very strong entry.
Regarding the samples, what surprised me is that those acid chirps worked so well, as in, they interfere much less with the tone channels than I was expecting. They took surprisingly little memory as well. This gave me an idea for a new engine, actually. How about just two channels of pitchable PWM samples or'ed together? With a bit of extra magic from the PWM encoder it should be quite flexible. As in - make 0 a special value instead of just an end marker - if followed by another 0, loop to the sample start (to enable tones), if followed by 1, stop sample playback, any other value = extend current half-cycle by n-2 samples. The converter should also invert the data if the total number "on" samples is greater than the total number of "off" samples.
Been talking to the guy on Spectrum Computing. Needless to say I'm happy to see some octode2k16 use as well.
That engine could definitely use some improvements though.
Yay, got one in as well. Alright, let's have a blast!
Hope you aren't going to hate me for saying this, but... I'm not really a fan of this one. Sounds like you wanted to make something energetic and uplifting while also introducing a bit of that classic horror vibe. That combination doesn't really work for me, it's like it's trying too many things at the same time. Sorry mate 
A little reminder about the approaching deadline of the beeper compo at Multimatograf. Let's show all the lAYmers who's the boss 
Does your onboard audio even have connectors for a PC Speaker? Oftentimes PC beep is just emulated in software nowadays.
Great find, as always. I recall reading about this shutdown event before, but didn't know a recording existed in the wild.
I'm afraid you can't really buy such a thing. It's really simple to make though. I'm very bad at soldering and have done it, so you can do it, too Check here for how to do it:
https://www.deinmeister.de/e_sbpcqlnk.htm
http://www.oldskool.org/guides/speakerrecording
If you really don't dare to do it yourself, try to find a fablab/makerspace and get help there. There are a few in your city, if I'm not mistaken.
I think the best option is to just wire the PC Speaker socket to a line out, and connect that to your hi-fi. Alternatively, most older sound cards have a socket for routing the PC Speaker through it (labelled SPKIN, usually), so you just need to connect that to the PC Speaker socket with a jumper cable.
The noise channel probably won't be useful since it starts on a low cycle.
However https://www.smspower.org/Development/SN76489 claims that
If the register value is zero or one then the output is a constant value of +1. This is often used for sample playback on the SN76489.
so we won't get any more volume range than we already have anyway. Might still be worth a try to see if 0 gives a better range than 1.
The 1-Bit Forum → Posts by utz
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