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Search: Posts Made By: pandy71
Forum: support.Hardware Yesterday, 22:24
Replies: 5
Views: 146
Posted By pandy71
If this is so important then you can do this or...

If this is so important then you can do this or by creating PCB and mimic/clone A1200 circuitry using uC populated on A1200 board or you can take generic uC and wrote own code to deal with A1200...
Forum: Hardware mods 14 June 2021, 21:33
Replies: 41
Views: 3,610
Posted By pandy71
Technically you can modify signal path and...

Technically you can modify signal path and provide 14 bit samples (i.e. AUDxDAT*AUDxVOL) same approach for panpot (a.k.a. panning i.e. possibility to mix channel level between L and R output).


...
Forum: Hardware mods 14 June 2021, 11:42
Replies: 41
Views: 3,610
Posted By pandy71
Well Ok - have similar attitude but having...

Well Ok - have similar attitude but having schematics will not lead directly to Verilog or similar HDL working code - real IC's schematics and HDL's are usually not equivalent as in IC's there is...
Forum: Hardware mods 13 June 2021, 22:31
Replies: 41
Views: 3,610
Posted By pandy71
Yes, AHI is not the best but to be honest i dont...

Yes, AHI is not the best but to be honest i dont know anything better that can be used - Linux (open source) solutions are too heavy on the required resources.



IC layout can be captured trough...
Forum: Hardware mods 12 June 2021, 18:43
Replies: 41
Views: 3,610
Posted By pandy71
This is not about "many programs" - this is about...

This is not about "many programs" - this is about affecting Amiga as overall - i can accept loss of some demos and games (and conditional if sane mechanism of disabling extension exist).

Don't get...
Forum: Hardware mods 12 June 2021, 16:19
Replies: 41
Views: 3,610
Posted By pandy71
Well - named 3 important applications for Amiga...

Well - named 3 important applications for Amiga where AGA introduce incompatibility so serious that Amiga loss something permanently.
Lot of incompatibilities was introduced for example by new...
Forum: Hardware mods 12 June 2021, 01:31
Replies: 41
Views: 3,610
Posted By pandy71
Not sure why adding functionality will add risk...

Not sure why adding functionality will add risk of breaking compatibility - if new functionality will be designed wisely then there is no risk of breaking compatibility. Adding 16 bit audio may be...
Forum: support.Hardware 11 June 2021, 01:17
Replies: 20
Views: 1,305
Posted By pandy71
If you are familiar with particular architecture...

If you are familiar with particular architecture then obviously it is best choice from your perspective - i have no doubt on this - situation change when you need to do something that can't be done...
Forum: Hardware mods 10 June 2021, 11:54
Replies: 41
Views: 3,610
Posted By pandy71
Very simple to explain - this is something we...

Very simple to explain - this is something we (Amiga users) expected to be done by Commodore and Commodore failed on many ways to do so.

Some of those features could be present since Amiga was...
Forum: support.Hardware 10 June 2021, 11:41
Replies: 20
Views: 1,305
Posted By pandy71
I think DMA controller (sometimes Flexible DMA -...

I think DMA controller (sometimes Flexible DMA - FDMA - DMA capable to process data similarily to Blitter is common in most of modern uC, especially for 32 bit ones as they usually don't deal very...
Forum: Hardware mods 08 June 2021, 16:04
Replies: 41
Views: 3,610
Posted By pandy71
This in not about discourage me or someone else -...

This in not about discourage me or someone else - this is about choices and each engineer is aware of such choices (i hope) - i agree with you - there is something else to create replacement part for...
Forum: support.WinUAE 08 June 2021, 15:44
Replies: 11
Views: 2,110
Posted By pandy71
looks like very unofficial WinUAE build - not...

looks like very unofficial WinUAE build - not sure if Toni was involved in this - but it looks quite tempting to be honest - last stand of real HW seem to be in danger...
Forum: support.Hardware 08 June 2021, 15:41
Replies: 20
Views: 1,305
Posted By pandy71
In theory with oversampling there is no need to...

In theory with oversampling there is no need to synchronously sample port and i think you will use oversampling anyway.

But perfect synchronous sampling would require to generate system clock for...
Forum: Coders. General 04 June 2021, 10:55
Replies: 59
Views: 2,016
Posted By pandy71
Technically - RAM can be used in ROM address...

Technically - RAM can be used in ROM address space (and this "shadow" RAM itself could be writable in different address space if FC0..FC2 used - FC is normally not used in Amiga so some effort is...
Forum: support.Hardware 03 June 2021, 12:44
Replies: 20
Views: 1,305
Posted By pandy71
Forgot about latest RPi - Pico is equipped with...

Forgot about latest RPi - Pico is equipped with RP2040 MCU and it has similar to TI, dedicated HW to perform software I/O - this is called PIO and looks quite ok in terms of this project - with...
Forum: Hardware mods 03 June 2021, 12:38
Replies: 41
Views: 3,610
Posted By pandy71
Quick search at Mouser for 5V compliant...

Quick search at Mouser for 5V compliant programmable devices:
...
Forum: Amiga scene 03 June 2021, 12:08
Replies: 29
Views: 1,627
Posted By pandy71
POSIX compatibility doesn't violate RTOS...

POSIX compatibility doesn't violate RTOS capability - see no problem in decent software availability... anyway for Amiga OS definitely Windows road is not a good reference...

Btw nowadays i rather...
Forum: Amiga scene 02 June 2021, 10:16
Replies: 29
Views: 1,627
Posted By pandy71
If i recall correctly it was time when QNX was...

If i recall correctly it was time when QNX was tailored as a OS for new Amiga - even some agreement was set on this between Bill McEwen and QNX rights owners, later QNX sources was partially...
Forum: Hardware mods 30 May 2021, 22:21
Replies: 41
Views: 3,610
Posted By pandy71
But this is common problem for retrocomputing and...

But this is common problem for retrocomputing and only one solution is to use 5V native logic - possible but at a horrendous price - still there is lot of old, 5V logic on market - mostly military...
Forum: Hardware mods 22 May 2021, 00:01
Replies: 41
Views: 3,610
Posted By pandy71
Some logic like 74LVC is more than OK - side to...

Some logic like 74LVC is more than OK - side to this FPGA with lower I/O can be used if some latch/multiplexing will be used (Amiga chipset bus is quite slow - less than 8Mhz most signals except...
Forum: support.Hardware 21 May 2021, 23:54
Replies: 20
Views: 1,305
Posted By pandy71
As quick capture USB frontend something like USB...

As quick capture USB frontend something like USB logic analyzer can be used (cheap Saleae clone should be more than fine - something like: https://sigrok.org/wiki/MCU123_Saleae_Logic_clone )
Forum: support.Hardware 10 May 2021, 14:10
Replies: 20
Views: 1,305
Posted By pandy71
This rule of thumb apply to oscilloscopes when...

This rule of thumb apply to oscilloscopes when sinx/x interpolation is used for rectangular signals (so pulse will appear like pulse not sine) - for your application rule of thumbs is that signal...
Forum: support.Hardware 09 May 2021, 21:33
Replies: 20
Views: 1,305
Posted By pandy71
Had similar idea - substitute head motor control...

Had similar idea - substitute head motor control by dedicated uC (so micro-stepping will be possible - possibility to read difficult tracks), replace flywheel servo by external one so variable...
Forum: support.Hardware 22 April 2021, 18:13
Replies: 27
Views: 1,512
Posted By pandy71
So next step would be something like Si5351A...

So next step would be something like Si5351A (https://www.adafruit.com/product/2045) - benefits are simple - not only ability to choose between NTSC/PAL but also possibility to emulate variable speed...
Forum: Retrogaming General Discussion 04 April 2021, 16:46
Replies: 194
Views: 11,704
Posted By pandy71
MC6850 used as UART in Atari ST also doesn't have...

MC6850 used as UART in Atari ST also doesn't have buffered data (in fact buffered are only 16550 and higher UART's). Paula and MC6850 are quite comparable in terms of CPU demand, Amiga is simply more...
Forum: Retrogaming General Discussion 02 April 2021, 16:39
Replies: 194
Views: 11,704
Posted By pandy71
Fundamentally this is same principle as in SACD...

Fundamentally this is same principle as in SACD (considered by some audiophiles superior to CD) - coded signal with speed around 1.1MHz can provide analog signal with over 70..80dB (for example 4th...
Forum: Retrogaming General Discussion 02 April 2021, 12:58
Replies: 194
Views: 11,704
Posted By pandy71
lol - name few reasonable priced sound chips that...

lol - name few reasonable priced sound chips that can be used in ST (not direct competition sourced)...

FYI Atari could use https://en.wikipedia.org/wiki/Atari_AMY and...
Forum: support.Hardware 01 April 2021, 08:21
Replies: 6
Views: 345
Posted By pandy71
?! How? Unless pins are physically damage then...

?! How? Unless pins are physically damage then caps leak should not affect IC's - thoroughly washed IC should be fine (caps residue may remain in tight space but still washing IC with water should do...
Forum: support.Hardware 19 March 2021, 18:10
Replies: 28
Views: 2,746
Posted By pandy71
There is new Open Source DeGate...

There is new Open Source DeGate https://github.com/DegateCommunity/Degate/ but all layers need to be available as pictures (metalization removed). Anyway tgether with already avaiable IC schematics...
Forum: Amiga scene 07 March 2021, 22:20
Replies: 505
Views: 39,694
Posted By pandy71
Main issue with Amiga was Amiga architecture...

Main issue with Amiga was Amiga architecture unable to cope with speed of changes on market. Chipset was designed in times where 512KiB RAM was considered as enormous amount of memory (famous "640KB...
Forum: support.Hardware 25 February 2021, 13:26
Replies: 10
Views: 637
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, 22:20
Replies: 21
Views: 1,824
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, 22:16
Replies: 10
Views: 637
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, 00:53
Replies: 10
Views: 637
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, 21:45
Replies: 3
Views: 531
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, 21:38
Replies: 10
Views: 518
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, 21:21
Replies: 10
Views: 637
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, 12:38
Replies: 298
Views: 20,603
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, 00:37
Replies: 298
Views: 20,603
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, 16:27
Replies: 298
Views: 20,603
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.
Showing results 1 to 40 of 1755

 
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