English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 1690
Search took 0.13 seconds.
Search: Posts Made By: pandy71
Forum: Nostalgia & memories 31 October 2019, 20:39
Replies: 74
Views: 3,486
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: 31
Views: 3,365
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: 1,351
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: 1,351
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: 1,351
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...
Forum: Coders. Asm / Hardware 13 October 2019, 23:44
Replies: 21
Views: 1,351
Posted By pandy71
Only vertical frequency - horizontal and pixel...

Only vertical frequency - horizontal and pixel clock stays unaltered.
Forum: Coders. Asm / Hardware 13 October 2019, 23:00
Replies: 21
Views: 1,351
Posted By pandy71
Isn't normal can be 312 for short OR 313 for long?

Isn't normal can be 312 for short OR 313 for long?
Forum: support.Hardware 08 October 2019, 22:52
Replies: 22
Views: 689
Posted By pandy71
Best way to deal with SCSI termination is remove...

Best way to deal with SCSI termination is remove terminators from devices (those funny resistors nets/groups in DIL or SIL package) and use Active Terminators on both ends of cable. Active Terminator...
Forum: support.Hardware 07 October 2019, 20:44
Replies: 24
Views: 2,010
Posted By pandy71
You can do that and it was made already on Amiga...

You can do that and it was made already on Amiga for Macintosh emulator to deal with variable speed FDD, almost each genlock do this on regular basis. If you re-clock Amiga then all timing will...
Forum: Coders. Asm / Hardware 03 October 2019, 21:22
Replies: 50
Views: 4,506
Posted By pandy71
Re-arm Audio DMA with Copper? - place word in...

Re-arm Audio DMA with Copper? - place word in AUDxDAT then arm audio DMA? or in opposite way? first trig Audio DMA with single word length in AUDxLEN and sample placed in AUDxDAT - key to high...
Forum: Coders. Asm / Hardware 30 September 2019, 21:36
Replies: 50
Views: 4,506
Posted By pandy71
Based on HRM if Audio DMA can't feed sufficiently...

Based on HRM if Audio DMA can't feed sufficiently fast new data to AUDxDAT then state machine repeat last word (i.e. 2 bytes/samples). So with proper cycle interleaving and perhaps some trick to...
Forum: Coders. Asm / Hardware 26 September 2019, 21:01
Replies: 50
Views: 4,506
Posted By pandy71
Nobody knows how PWM Paula works (AFAIK nobody...

Nobody knows how PWM Paula works (AFAIK nobody made REI on Paula - decap + https://degate.org/ ) - PWM can be applied to DAC reference or to 8 bit register at the DAC input or to analog output (CMOS...
Forum: Coders. Asm / Hardware 23 September 2019, 22:31
Replies: 50
Views: 4,506
Posted By pandy71
True, i was wrong - this feature can be used to...

True, i was wrong - this feature can be used to emulate CLUT but it is not real CLUT, AFAIR it can be used by TMS340x0 family together with external Truecolor RAMDAC - need to dig on this - should...
Forum: Coders. Asm / Hardware 11 September 2019, 23:33
Replies: 50
Views: 4,506
Posted By pandy71
Don't mix two things - A2024 need few frames to...

Don't mix two things - A2024 need few frames to create larger bitplane with lower refresh rate - as such it is mandatory to use internal frame buffer. MOS Technology 390562 is glue logic - patent...
Forum: Coders. Asm / Hardware 10 September 2019, 23:27
Replies: 50
Views: 4,506
Posted By pandy71
A2024 is same class device as DCTV, Graffiti,...

A2024 is same class device as DCTV, Graffiti, HAM-E & HAM-E Plus and similar - Video Port is used as 4 bit data port. UHRES is something else - this is real extension to OCS - and based on all...
Forum: Coders. Asm / Hardware 06 September 2019, 22:37
Replies: 50
Views: 4,506
Posted By pandy71
Sorry for late reply, since few months i have...

Sorry for late reply, since few months i have very hectic time.
Based on informations provided by You seem this is not implemented feature i.e. writing corresponding registers and bits should NOT...
Forum: support.Hardware 31 March 2019, 15:27
Replies: 14
Views: 1,986
Posted By pandy71
Too long exposure for UV may kill EPROM...

Too long exposure for UV may kill EPROM permanently. I assume every software is able to verify if EPROM is clean/erased - if not then read EPROM and check for content - it should have all data bits...
Forum: Retrogaming General Discussion 30 March 2019, 13:47
Replies: 34
Views: 1,901
Posted By pandy71
Based on latest EU law called in PL 'ACTA2' you...

Based on latest EU law called in PL 'ACTA2' you have rights to use other people work as quotation/citation and also technically they can't block Amiga Demos as this is ART (autonomous visual\musical...
Forum: Retrogaming General Discussion 28 March 2019, 15:56
Replies: 34
Views: 1,901
Posted By pandy71
Issue is that Crowley Media business activity...

Issue is that Crowley Media business activity area is different than: content management and/or representing owners rights - this is company registered in Poland with U.S. owner perhaps (unclear)....
Forum: Coders. Asm / Hardware 27 March 2019, 20:30
Replies: 66
Views: 3,167
Posted By pandy71
True but seem some limitations exist and we...

True but seem some limitations exist and we talking on 15 or 16 bit address (so up to 256 banks of 256 color registers).
not sure if i recall correctly but Toni mention some limitations in HAM mode...
Forum: Coders. Asm / Hardware 27 March 2019, 11:38
Replies: 66
Views: 3,167
Posted By pandy71
Nope - this will be pair of registers - address...

Nope - this will be pair of registers - address register and data register.
Access time doesn't change (except it require 2 cycles)




Yes and no, first we talking on first 16MiB space...
Forum: Coders. Asm / Hardware 26 March 2019, 21:48
Replies: 66
Views: 3,167
Posted By pandy71
Why not? why not 32768 or 65356 24 bit color...

Why not? why not 32768 or 65356 24 bit color registers where lower part (up to 6 bits) is controlled traditionally (i.e. by bitplane data) and higher bits are controlled by Copper?



Nope, it...
Forum: support.Hardware 26 March 2019, 18:22
Replies: 12
Views: 872
Posted By pandy71
Amiga HSync and VSync are VGA compatible, use...

Amiga HSync and VSync are VGA compatible, use CSync instead, AD724 datasheet provide information how to do it.

If available, the AD724 will also
accept a standard CSYNC signal by connecting...
Forum: Coders. Asm / Hardware 26 March 2019, 17:48
Replies: 66
Views: 3,167
Posted By pandy71
ECS/AGA can be progressive (at a cost of...

ECS/AGA can be progressive (at a cost of framerate) In theory you can have 2047 lines of video thus with 15kHz H Sync you will have video like 7.63fps

Pixel clock (constant for Amiga custom chips...
Forum: Retrogaming General Discussion 11 February 2019, 12:45
Replies: 147
Views: 9,867
Posted By pandy71
Well... from my perspective he is passionate,...

Well... from my perspective he is passionate, determined and wiling to do research - classical example is color reduction to efficiently use CLUT machines limitation (valid for Amiga and Atari ST) -...
Forum: Retrogaming General Discussion 10 February 2019, 14:32
Replies: 147
Views: 9,867
Posted By pandy71
After brief source check, Paula emulation is done...

After brief source check, Paula emulation is done with fixed frequency (obvious as STE do not support variable sample rate as Paula) - and this means that anything sampled faster than 25033Hz will be...
Forum: support.Hardware 02 February 2019, 02:03
Replies: 11
Views: 822
Posted By pandy71
You can use this method - i strongly disagree...

You can use this method - i strongly disagree with their approach to PCB tin plating but this method will work nicely for rusty Amiga shield - remove rust mechanically to clean metal (sanding paper?...
Forum: support.Hardware 02 February 2019, 01:52
Replies: 2
Views: 278
Posted By pandy71
Ages ago i've used styrofoam and aluminium foil...

Ages ago i've used styrofoam and aluminium foil to store IC's. It works fine. Cons may be way lower impedance - at some point this may be issue for charged capacitors - by connecting with foil large...
Forum: Retrogaming General Discussion 02 February 2019, 01:43
Replies: 147
Views: 9,867
Posted By pandy71
Don't get me wrong but i see no problem to...

Don't get me wrong but i see no problem to convert signed to unsigned and vice versa - important is quantization steps and seem curve is correct - higher level less accurate (bigger) quantization...
Forum: Retrogaming General Discussion 29 January 2019, 21:44
Replies: 147
Views: 9,867
Posted By pandy71
Well... it looks to me quite OK - similar...

Well... it looks to me quite OK - similar characteristics are common for example ulaw/Alaw https://en.wikipedia.org/wiki/%CE%9C-law_algorithm
Main difference is insufficient bit resolution (4 or 5)...
Forum: Amiga scene 16 January 2019, 15:23
Replies: 90
Views: 9,183
Posted By pandy71
Nice art but i realised that all files are jpg...

Nice art but i realised that all files are jpg and they are affected by jpg artifacts (https://en.wikipedia.org/wiki/Gibbs_phenomenon) - it is better to use png or gif instead jpg for pixel art...
Forum: Retrogaming General Discussion 16 January 2019, 14:46
Replies: 147
Views: 9,867
Posted By pandy71
Atari ST use YM2149 which is enhanced version of...

Atari ST use YM2149 which is enhanced version of AY-3-8910 - so AY-3-8910 is worse than YM2149. Audio quality difference is meaningless and enhancements are mostly functional type.

Comparing with...
Forum: Retrogaming General Discussion 15 January 2019, 21:52
Replies: 147
Views: 9,867
Posted By pandy71
Depends, signal volume/envelope control in AY is...

Depends, signal volume/envelope control in AY is 4 bit (non linear - approx logarithmic), SID and POKEY are 4 bit linear AFAIR, ST YM is 5 bit (significant difference from AY). So noisy (high...
Forum: Retrogaming General Discussion 14 January 2019, 12:58
Replies: 147
Views: 9,867
Posted By pandy71
I expressed this earlier - compare comparable,...

I expressed this earlier - compare comparable, trying to compare incomparable things you need to be very careful and use values in proper context - i don't judge POKEY quality, also don't judge AY...
Forum: Retrogaming General Discussion 14 January 2019, 03:41
Replies: 147
Views: 9,867
Posted By pandy71
Then even Intel 8253 can be considered as...

Then even Intel 8253 can be considered as "GENERAL PURPOSE sound chip"...
Forum: Retrogaming General Discussion 10 January 2019, 18:12
Replies: 147
Views: 9,867
Posted By pandy71
Well, DSD use 2.8224MHz 1-bit to be High End...

Well, DSD use 2.8224MHz 1-bit to be High End audio source (120dBFS).
So i estimate that difference between 985kHz and 3.58MHz is around 50dB
Are you able to hear difference between 7 and 16 bits?
...
Forum: Retrogaming General Discussion 10 January 2019, 02:56
Replies: 147
Views: 9,867
Posted By pandy71
What a bizarre thread... Atari (ST) had chance to...

What a bizarre thread... Atari (ST) had chance to deliver decent audio chip - it was called "AMY 1" (https://en.wikipedia.org/wiki/Atari_AMY) and can do something like IFFT (additive synthesis) - but...
Forum: Hardware mods 06 July 2018, 18:18
Replies: 28
Views: 2,953
Posted By pandy71
Excuse late reply - as i said earlier - other...

Excuse late reply - as i said earlier - other activities has higher priority and also as i said earlier - if i can help then i will be happy to help.
If you face any problem then you should share...
Forum: Hardware mods 03 July 2018, 12:27
Replies: 28
Views: 2,953
Posted By pandy71
Doing some things on this area but decided to not...

Doing some things on this area but decided to not say anything until it will be ready.
Progress is slow due other things with higher priority.



I need to finish other things first so decided...
Forum: Hardware mods 03 July 2018, 12:23
Replies: 6
Views: 887
Posted By pandy71
Nope - there can be more than 1.5MB slow, and...

Nope - there can be more than 1.5MB slow, and over 1.5MB in other areas normally not used (depends on machine and used extensions).
And 68K allow to address 4x 16MiB (program and data for user and...
Showing results 1 to 40 of 1690

 
Forum Jump

All times are GMT +2. The time now is 21:41.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2019, vBulletin Solutions Inc.
Page generated in 0.16080 seconds with 10 queries