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Search: Posts Made By: pandy71
Forum: support.Hardware 25 February 2021, 14:26
Replies: 10
Views: 401
Posted By pandy71
Can't argue beyond fact that i don't have CDTV...

Can't argue beyond fact that i don't have CDTV service manual covering this board. Only video slot is provided on schematics.
I may assume that CDTV video board is somehow similar to Commodore...
Forum: Coders. Asm / Hardware 24 February 2021, 23:20
Replies: 21
Views: 1,042
Posted By pandy71
Honestly... it is not possible unless you have...

Honestly... it is not possible unless you have reliable external frequency source not linked with system clock - proper NTSC and proper PAL are using different system clock and Horizontal timing is...
Forum: support.Hardware 24 February 2021, 23:16
Replies: 10
Views: 401
Posted By pandy71
Use SCART standard (EN50049 attached) as...

Use SCART standard (EN50049 attached) as reference.

It is not possible to have short circuit if everything is properly connected - verify (double, triple or more if necessary) your pin numbering...
Forum: support.Hardware 23 February 2021, 01:53
Replies: 10
Views: 401
Posted By pandy71
i've read your SCART cable description -...

i've read your SCART cable description - something is wrong - you need feed Amiga CSYNC to pin 20 in SCART (Composite Video Input), RGB signals shall be feed to pins 7 (Blue), 11 (Green), 15 (Red),...
Forum: Hardware mods 22 February 2021, 22:45
Replies: 3
Views: 269
Posted By pandy71
Replace resistor with some PTC fuse - at least it...

Replace resistor with some PTC fuse - at least it will be sane solution immune to fail.
Calculation is simple - U (in Volts)/I (Current in Amps) - lets assume that mouse should work with 4.5V supply...
Forum: support.Hardware 22 February 2021, 22:38
Replies: 10
Views: 387
Posted By pandy71
Use DPaint and draw circle - then use normal...

Use DPaint and draw circle - then use normal ruler and adjust geometry.
Forum: support.Hardware 22 February 2021, 22:21
Replies: 10
Views: 401
Posted By pandy71
Firstly only A1000 (trough ancient MC1377), A600,...

Firstly only A1000 (trough ancient MC1377), A600, A1200 and CD32 (all trough way more modern CXA1145) offer color composite signal.
Secondly A500,A2000, A3000, A4000 CDTV are unable to provide color...
Forum: Coders. Asm / Hardware 10 February 2021, 13:38
Replies: 296
Views: 9,791
Posted By pandy71
If there is any chance for using 2 audio channels...

If there is any chance for using 2 audio channels with normal DMA to play samples but in interleaved way - like for example |cn| where c means Channel and n is sample e.g. 00,10,01,11,02,12,03,13...
Forum: Coders. Asm / Hardware 10 February 2021, 01:37
Replies: 296
Views: 9,791
Posted By pandy71
Gosh... lot of distortions...some aliasing seem...

Gosh... lot of distortions...some aliasing seem to be also present...
Forum: Coders. Asm / Hardware 09 February 2021, 17:27
Replies: 296
Views: 9,791
Posted By pandy71
Sadly to say it is heavily crushed with dynamics...

Sadly to say it is heavily crushed with dynamics in total less than 30dB...
I don't think that music particularly with such poor dynamics is good test material.
Forum: Coders. Asm / Hardware 09 February 2021, 16:49
Replies: 296
Views: 9,791
Posted By pandy71
This is 16 bit wav, mono, with sample rate...

This is 16 bit wav, mono, with sample rate 27710Hz so it can be played directly on Amiga with regular OCS screen and regular DMA (after conversion to 14 bit either 8 bit) - sine wave was coded as 15...
Forum: Coders. Asm / Hardware 09 February 2021, 16:12
Replies: 296
Views: 9,791
Posted By pandy71
Tried to propose alternative that can be measured...

Tried to propose alternative that can be measured - will be good if you can join this to overall audio file list.
Forum: Coders. Asm / Hardware 09 February 2021, 15:35
Replies: 296
Views: 9,791
Posted By pandy71
Try attached one - 5 seconds, single channel, 16...

Try attached one - 5 seconds, single channel, 16 bit wav, 997Hz sine with sample rate 27710.1171875Hz with almost 0dBFS level quantized at 15 bit with HPTPDF dither. Should be ok with 14 bit playout...
Forum: Coders. Asm / Hardware 09 February 2021, 14:20
Replies: 234
Views: 13,597
Posted By pandy71
With proper lowpass filter (based on...

With proper lowpass filter (based on Gerzon-Craven noise shaping theorem we have more than 7..8kHz band free to be used by aggressive noise shaping) this approach should provide better results than...
Forum: Coders. Asm / Hardware 09 February 2021, 13:44
Replies: 296
Views: 9,791
Posted By pandy71
AUDxPER in Amiga is a Sample Rate - we can't...

AUDxPER in Amiga is a Sample Rate - we can't ignore physics - Paula is clocked 1/8th of main clock and all samples are internally resampled (Zero Order Hold...
Forum: Coders. Asm / Hardware 09 February 2021, 12:10
Replies: 296
Views: 9,791
Posted By pandy71
IMHO period 128 should be used due PWM (unwanted...

IMHO period 128 should be used due PWM (unwanted and additional distortions present in periods different than 128)
Forum: Coders. Asm / Hardware 09 February 2021, 11:44
Replies: 296
Views: 9,791
Posted By pandy71
There is 65 levels from Max to null....

There is 65 levels from Max to null. http://amiga-dev.wikidot.com/hardware:audxvol - special coder (mapper) should use approach where one DAC is free from PWM and remain fraction is PWM active - with...
Forum: Coders. Asm / Hardware 08 February 2021, 15:11
Replies: 234
Views: 13,597
Posted By pandy71
He is confused not getting exact frequency from...

He is confused not getting exact frequency from 44100Hz source WAV as he ignore inability of Paula to get exact 44100Hz play out rate... (as i pointed earlier this will require sample rate conversion...
Forum: Coders. Asm / Hardware 14 January 2021, 22:17
Replies: 234
Views: 13,597
Posted By pandy71
My point is that you should be more familiar how...

My point is that you should be more familiar how to measure digital audio... Amiga cannot create 44100Hz sample rate - Paula can create only $4F 44897.41Hz, $50 44336.19Hz, $51 43788.83Hz.
FFT...
Forum: Coders. Asm / Hardware 13 January 2021, 02:37
Replies: 234
Views: 13,597
Posted By pandy71
So follow industry standards...

So follow industry standards...
Forum: support.Hardware 10 January 2021, 22:55
Replies: 4
Views: 265
Posted By pandy71
https://www.lidl.de/de/parkside-performance-bit-se...

https://www.lidl.de/de/parkside-performance-bit-set-torsion-pbsp-2-b2/p361404
https://www.lidl.de/de/parkside-steckschluesselsatz-psss-36-a1-36-teilig/p364518

This is standard 5 mm hex socket -...
Forum: Amiga scene 09 January 2021, 22:27
Replies: 139
Views: 17,482
Posted By pandy71
Well - it could be made similarly as simple BBD...

Well - it could be made similarly as simple BBD only digital - around 70 - 80k of transistors - also CBM could use process with higher density similarly to Lisa (HP source) - in fact integrate Agnus,...
Forum: Amiga scene 08 January 2021, 22:01
Replies: 139
Views: 17,482
Posted By pandy71
In theory there is simple workaround for...

In theory there is simple workaround for mentioned bus timing limitation - using invisible video lines time to transfer (in bursts / bulk) Audio data (and store it internally in Paula in some kind of...
Forum: Amiga scene 08 January 2021, 00:06
Replies: 139
Views: 17,482
Posted By pandy71
Nope, sound and disk are linked to horizontal...

Nope, sound and disk are linked to horizontal frequency and as fundamental principle for Amiga - everything related to system timing is tightly coupled with color subcarrier frequency (video signal)....
Forum: Amiga scene 07 January 2021, 00:42
Replies: 139
Views: 17,482
Posted By pandy71
My assumption is that before Commodore purchase...

My assumption is that before Commodore purchase and even after Amiga existed as a bunch of PCB's with plenty of PAL + TTL so later, when silicon was created, all conversion was required anyway due...
Forum: support.Hardware 05 January 2021, 19:57
Replies: 7
Views: 470
Posted By pandy71
70% IPA is for medical use (disinfectant) - 99%...

70% IPA is for medical use (disinfectant) - 99% IPA is solvent - higher water content raise concerns on drying.
Forum: Amiga scene 05 January 2021, 19:19
Replies: 139
Views: 17,482
Posted By pandy71
Agree but only to some point - SID already...

Agree but only to some point - SID already existed so some concepts from SID could be moved to Paula (like NCO) - and 16 bit counter vs 16 bit NCO was not so different in terms of complexity and even...
Forum: Amiga scene 05 January 2021, 18:39
Replies: 139
Views: 17,482
Posted By pandy71
Paula is quite OK but lot of possibilities are...

Paula is quite OK but lot of possibilities are lost, firstly frequency resolution is too coarse on useful range and too high where it is not useful at all (fine frequency resolution on very low...
Forum: Hardware mods 24 December 2020, 16:01
Replies: 4
Views: 1,182
Posted By pandy71
You can do anything with FPGA but what with...

You can do anything with FPGA but what with software? You can for example place local RAM for Copperlist and thus eliminate some of the limitations, you can internally work with higher clock...
Forum: Nostalgia & memories 19 October 2020, 01:11
Replies: 312
Views: 18,246
Posted By pandy71
State of graphic was strictly related with...

State of graphic was strictly related with lithography of those times, thanks to Ronald Reagan decision about starting so called "star wars" a lot of money was pumped to create lithography below 1um...
Forum: Nostalgia & memories 12 October 2020, 20:05
Replies: 292
Views: 14,693
Posted By pandy71
I miss on PC "RAD:" - AFAIK there is no (in...

I miss on PC "RAD:" - AFAIK there is no (in modern PC world) RAD-like solution - also "RAM:" implementations are way more limited (albeit when compared to "RAD:" at least their exist).

Luckily to...
Forum: Nostalgia & memories 28 September 2020, 00:15
Replies: 312
Views: 18,246
Posted By pandy71
Pointless discussion - Amiga provided bit...

Pointless discussion - Amiga provided bit blitting and line drawing as standard, supported by OS and reasonable price for mass market - workstations, particularly those graphical was never tailored...
Forum: Coders. Asm / Hardware 27 September 2020, 23:57
Replies: 32
Views: 2,492
Posted By pandy71
AFAIR there was alternative solution to provide...

AFAIR there was alternative solution to provide HD without slowing down floppy RPM - DRAM buffer was used to store track during R/W operations - from Amiga perspective this will be fully transparent...
Forum: support.Hardware 20 August 2020, 00:19
Replies: 17
Views: 867
Posted By pandy71
Go for cheap ARM MCU with embedded ADC, most of...

Go for cheap ARM MCU with embedded ADC, most of them are over 10 -12 bit resolution (some are equipped with two or more simultaneously sampling ADC's so stereo is possible without phase issues) and...
Forum: Amiga scene 14 July 2020, 15:53
Replies: 199
Views: 19,423
Posted By pandy71
Years ago i've experimented a bit with ffmpeg and...

Years ago i've experimented a bit with ffmpeg and potrace trying to create silhouettes video and later vectorize it - script below:

@setlocal
@if not exist %cd%\pot (mkdir %cd%\pot)
@rem for %%1...
Forum: Nostalgia & memories 31 October 2019, 20:39
Replies: 113
Views: 10,097
Posted By pandy71
386DX not, 386SX @16MHz at some points definitely...

386DX not, 386SX @16MHz at some points definitely yes especially on system without L2 cache and without math coprocessor - had opportunity to compare real life performance and usually A500 with...
Forum: Amiga scene 20 October 2019, 18:30
Replies: 41
Views: 6,406
Posted By pandy71
No added value - AAA if egver exist for real...

No added value - AAA if egver exist for real would be a dead end for Amiga graphics... just few interesting features (32 bit Copper with more functionality, perhaps HAM10, above this nothing special)...
Forum: Coders. Asm / Hardware 20 October 2019, 18:23
Replies: 21
Views: 2,183
Posted By pandy71
Not from chipset perspective, of course OS will...

Not from chipset perspective, of course OS will be affected but DMA slots stays unchanged... just write in line for example 200 to VPOSW/VHPOSW that this is line 100 and that's all - from HW...
Forum: Coders. Asm / Hardware 20 October 2019, 13:29
Replies: 21
Views: 2,183
Posted By pandy71
Changing vertical refresh rate is easy - CPU can...

Changing vertical refresh rate is easy - CPU can nicely write to VHPOSW/VPOSW extending frame lenght (on real TV i've get progressive 625 lines at 25Hz - CRT flickered obviously but TV electronics...
Forum: Coders. Asm / Hardware 14 October 2019, 00:58
Replies: 21
Views: 2,183
Posted By pandy71
I've tried many years ago - it was fail (from...

I've tried many years ago - it was fail (from strange effects on particular horizontal lines to complete hang on Amiga) - but my knowledge was very limited (no information about details of Amiga...
Showing results 1 to 40 of 1725

 
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