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Old 04-29-2016, 07:15 PM
JuanPC JuanPC is offline
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Join Date: Jul 2014
Location: Miami FL
Posts: 600
Default Need help to find all boards with MIDI MPU-401

Joystick / MIDI MPU-401 "Game" port built-in to the board.

Some Compaq presario 2200
Some Compaq presario 4505, 4508, 4550
Some Compaq presario 4700, 4784

ASROCK P4I45GV
Albatron PX865PE PRO
ASRock U-COP
Lite-On 110 NR

It must be able to load Windows XP...
Probably Pentium 4/3
Or similar AMD Athlon XP 1/2*** +
http://www.cpubenchmark.net/low_end_cpus.html

Any CPU that makes around 150 points in WinRAR benchmark test, is good enough for XP.

Those boards work amazing with rptMIDi/ipMIDI.
And cheaper than KissBox MIDI.
http://www.kissboxus.com/category-s/101.htm

The compaq I tested has 0.2ms jitter,
Less than 1.5ms latency & deviation...

Pentium 3:
Azza XFX U601BS Socket 370
Intel D815EEA
Intel DR737

....
how good they are:

1 minute = 60seconds = 60000 milliseconds.
60000/120 Beats per Minute = 500ms beat = 1/4 note at 4/4
250ms = 1/2beat = 1/8 note.
125ms = 1/4beat = 1/16 note.
62.5ms = 1/8beat = 1/32 note.
31.25ms = 1/16beat = 1/64 note.
15.625ms = 1/32beat = 1/128 note.
....
7.8125ms = 1/64beat = 1/256 note.
3.90625ms = 1/128beat = 1/512 note.
1.953125ms = 1/256beat = 1/1024 note.
0.9765625ms = 1/512beat = 1/2048 note.
0.48828125ms = 1/1024beat = 1/4096 note.
0.244140625ms = 1/2048beat = 1/8192 note.
0.122070312ms = 1/4096beat = 1/16384 note.
0.061035156ms = 1/8192beat = 1/32768 note.

44.1KHz audio ea. sample is 0.0226757369614512ms
48KHz audio, each sample is 0.0208333333333333ms
96KHz audio, each sample is 0.0104166666666667ms
192KHz audio ea. sample is 0.0052083333333333ms.

Midi signal goes at 31250 bits / second.
1000ms / 31250 = 0.032ms = 32µs per bit.
8-bits / 1-byte message size + 1-start + 1-stop bits = 10-bits.
320us per message. = 0.32ms.

but.. MIDI Clock goes at 24 pulses per quarter note. = 96 pulses per bar of 4/4 or.. At 120 BPM = 2880 Midi Clock Pulses per minute.
48000Hz/second sample rate has 2880000 samples per minute. "60 seconds."
A perfect MIDI Clock shoulbe exactly each at 1000 samples at 48KHz Sample Rate.
========
Audio latency on the other hand....
Assuming the AD&DA converter has the latest Cirrus Logic converters with Digital Anti-Alias Filters...
"Best case scenario."
a latency of:
@
44.1KHz = 0.27ms AD "12samples"
+ 0.22ms DA "10-samples."
48.0KHz = 0.25ms AD
+ 0.20ms DA
88.2KHz = 0.1ms AD "9 samples"
+ 0.056ms DA "5-samples."
96.0KHz = 0.09ms AD
+ 0.052ms DA
176.4KHz = 0.028ms AD "5 samples"
+ 0.028ms DA "5-samples"
192.0KHz = 0.028ms AD
+ 0.026ms DA

@48KHz = 0.25ms + 0.2ms = 0.45ms latency only the converters.
@96KHz = 0.09ms + 0.052 = 0.142ms.
@192KHz = 0.028ms + 0.026ms = 0.054ms.

Most DSP mixers add 2-samples of latency.
+ ASIO/Core Audio driver Latency/Buffer size.
2048 or 1024 or 512 or 256 or 128.

1 second = 1000ms
44100 = 0.022675737ms each sample. x Buffer Size + AD+DA + DSP
48000 = 0.020833333ms each sample.
96000 = 0.010416667ms each sample.
192000 = 0.005208333ms each sample.

@48KHz 128 buffer = 0.020833333×128 = 2.666666624ms. *
@48KHz 256 buffer = 0.020833333×256 = 5.333333248ms. **
@48KHz 512 buffer = 0.020833333×512 = 10.666666496ms. ***
@48KHz 1024 buffer = 0.020833333×1024 = 21.333332992ms. ****
@48KHz 2048 buffer = 0.020833333×2048 = 42.666665984ms.

@48KHz = 0.45ms + 128 buffer = 3.116666624ms + DSP latency "~2-samples."
@48KHz = 0.45ms + 256 buffer = 5.783333248ms + DSP.
@48KHz = 0.45ms + 512 buffer = 11.116666496ms + DSP.
@48KHz = 0.45ms + 1024 buffer = 21.783332992ms + DSP.
@48KHz = 0.45ms + 2048 buffer = 43.116665984ms + DSP.

@96KHz 128 buffer = 0.010416667×128 = 1.333333376ms.
@96KHz 256 buffer = 0.010416667×256 = 2.666666752ms. *
@96KHz 512 buffer = 0.010416667×512 = 5.333333504ms. **
@96KHz 1024 buffer = 0.010416667×1024 = 10.666667008ms. ***
@96KHz 2048 buffer = 0.010416667×2048 = 21.333334016ms. ****

@96KHz = 0.142ms. + 128 buffer = 1.475333376ms + DSP Latency "~2-samples."
@96KHz = 0.142ms. + 256 buffer = 2.808666752ms + DSP.
@96KHz = 0.142ms. + 512 buffer = 5.475333504ms + DSP.
@96KHz = 0.142ms. + 1024 buffer = 10.808667008ms + DSP.
@96KHz = 0.142ms. + 2048 buffer = 21.475334016ms + DSP.

@192KHz = 0.054ms. + 128 buffer = ms + DSP Latency "~2-samples."
@192KHz = 0.054ms. + 256 buffer = ms + DSP.
@192KHz = 0.054ms. + 512 buffer = ms + DSP.
@192KHz = 0.054ms. + 1024 buffer = ms + DSP.
@192KHz = 0.054ms. + 2048 buffer = ms + DSP.

========
Distance: 343.2mts/s = 34320cm / 1000ms. "@ 20°C at sea level."
1ms = 34.32cm = 0.3432mts.
2ms = 68.64cm = 0.6864mts.
10ms = 343.2cm = 3.43mts.
20ms = 686.4cm = 6.86mts.
========
Interesting Reading....
http://www.innerclocksystems.com/New...k%20Watch.html
http://www.innerclocksystems.com/New...us%20Midi.html
http://www.innerclocksystems.com/new...%20litmus.html
http://www.innerclocksystems.com/New...20E-Drums.html
http://www.innerclocksystems.com/New...0Hardware.html
http://www.innerclocksystems.com/New...elativity.html

Last edited by JuanPC; 05-24-2016 at 09:34 PM.
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  #2  
Old 05-15-2016, 08:07 AM
JuanPC JuanPC is offline
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Join Date: Jul 2014
Location: Miami FL
Posts: 600
Default Re: Need help to find all boards with MIDI MPU-401

Miditest 4

gone from developer website...
scanned with Latest Malwarebytes.org database.

remove the .pdf
files are .rar & .zip

works in OSX with PlayOnMac + Latest Wine.
Attached Files
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