6502.org

Thanks, that OTP might be an option since you have verifies it works at 14 MHz.
I am only allowed to use DIP parts, and I see they are available...

https://www.digikey.ca/en/products/deta ... PU/1118860

I will have to ensure that my OS is decent at 14Mhz, but so far things are looking ok.
With my new design, I am not displaying much during a recording operation, so I have zero latency so far.
Having the second 6502 doing the bare metal sample playback functions makes all the difference.

So far the most cycle intensive routine is my full screen text scrolling function and the drawing of 640x224 bitmaps of waveforms.
That's ok though as these operations are not happening during live playback or recording.

I am 55 and still far from saying "heh? speak into my good ear"!
I can hear 16Khz, and often find others in my ancient group have things up too loud.
Of course, I am still young enough to just want to blast out the windows when I jam, so this latest upgrade is most excellent.

I did up some samples that are similar to Roland JX8 on Final Countdown last night and the sound is so much better with these speakers.
Having way more power than necessary means that on a moderate level they are ultra crisp.
But that bass... wow, I would totally recommend the DM-112 to anyone for a full range of use.

Now I am just pondering one final possible mod... going to greyscale on the display instead of mono.
Right now, the syncgen hurls out pixels via shift register from the sram. Simple, easy, low ram needed.
But it is actually less hardware to push all 8 bits into an R2R DAC and have up to 256 shades on the mono CRT.
Drawing will take longer, but this is not a timing critical operation.

The benefit is that an OS can look so much more refined with shades.
I am also implementing wave creation tools, so drawing waveforms will look more detailed as well.
To the CRT, it's all the same simple composite signal, so the hardware is all good.
The only downside is that I have to rewire the entire video circuit again!
I will think about it all day at work when I am installing APs and stringing CAT-6 across a warehouse.
Later,
Brad

A random turn on the internet revealed this echo of the past...
Even in the 1936 they understood the importance of wall pounding sound in a keyboard.
This amazing creation has more wood and speaker real-estate than mine!

But you don't have to pedal yours

Though... are you part grasshopper, to keep your ears in your knees? :p

Neil

Mine does have two analog pedals.
One is for the control of the decay ramp (basically a sustain).
The other is assignable to effects, like a low pass while leading into a beat.
During a mix bounce or track replay between RAMs, effects are recorded live.

Aha, I saw it as a harmonium; a foot-pumped keyboard reed instrument.

Neil

<something about that name>

Barbarella!

Once again, the monster is on the move.
I have been renovating my basement, so the synth has traversed the 18 steps to find it's home in my new tiny secret 12x12 lab.
The frame isn't all that heavy (maybe 50 pounds), but it quite a dance to get it around corners without scuffing the walls.
As planned, it just fits along the 75 inch wall I left for it...
You can also see the video generator being redone on my smaller breadboard.
I have decided to change the typical monochrome shift reg video output to 8 bit greyscale.
Screen drawing will be a bit slower, but now I can really make a nice looking user interface.

Oh, and of course the two removable pillars are going to need a rework now that they are to contain those 1200 watts worth of window blasting speakers!
That will have to wait until the snow is gone as my welding shack is buried out in the back 40 for a few more months.

Later,
Radical Brad

For some reason, this https://www.youtube.com/watch?v=ho9rZjlsyYY is drifting through my thoughts...

Neil

I like all of the above!
Yes, I will be planning to create a very high quality organ sample set.
I have already done a Grande piano set with fully samples strikes for every 4th key.
It actually sounds almost as good as my modern digital!

Since you guys have mentioned pipe organ so often, I shall dedicate to doing that sample set next.
I can imagine it will sound very close to the original with samples on every 4th key and pushing through those 1200 watt 15 inch monsters!
I can sort of play that Bach D-Minor organ tune, but will need to listen to it a few more times to get it close enough.
That will be my next video demo to post.

Brad