English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 1653
Search took 0.13 seconds.
Search: Posts Made By: pandy71
Forum: Hardware mods 06 July 2018, 17:18
Replies: 28
Views: 1,863
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, 11:27
Replies: 28
Views: 1,863
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, 11:23
Replies: 6
Views: 595
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...
Forum: support.Hardware 03 July 2018, 11:17
Replies: 5
Views: 269
Posted By pandy71
Use A520 schematics (...

Use A520 schematics ( http://members.iinet.net.au/~davem2/overclock/A520.html ) and MC1377 datasheet - or replace PCB with something more modern.
Forum: support.Hardware 03 July 2018, 11:12
Replies: 10
Views: 456
Posted By pandy71
You didn't fixed issue - you only replaced some...

You didn't fixed issue - you only replaced some parts that was corrupted as outcome of the issue itself - short way to repeating damages. Use service manual and/or datasheet for part - disconnect...
Forum: Hardware mods 03 July 2018, 00:38
Replies: 28
Views: 1,863
Posted By pandy71
I see - then OK. Check page 10 - video...

I see - then OK.



Check page 10 - video clocks and phase relations between them.
Forum: Hardware mods 02 July 2018, 22:20
Replies: 28
Views: 1,863
Posted By pandy71
It can be different phase - you should check...

It can be different phase - you should check Gayle datasheet - there is waveforms provided to show all dependencies. Side to this my assumption is that you using video port not hooking wires to pins...
Forum: support.Hardware 02 July 2018, 17:49
Replies: 10
Views: 456
Posted By pandy71
You should check oscilograms (waveforms diagrams...

You should check oscilograms (waveforms diagrams in technical spec) especially on horizontal deflection - as 1084 is made similar to small (14 inch) TV then flyback may be shared with PSU.
Forum: Hardware mods 02 July 2018, 17:42
Replies: 6
Views: 595
Posted By pandy71
idrougge is right - easily can't be done but... ...

idrougge is right - easily can't be done but...

...but you could modify autoconfig and add chips on top (piggyback), modify address selection (so efficiently building new expansion) to fit some...
Forum: Hardware mods 02 July 2018, 17:22
Replies: 28
Views: 1,863
Posted By pandy71
Yes, Agnus is address generator (it produce...

Yes, Agnus is address generator (it produce address but data going to Denise), you can manually (CPU and/or Copper) feed data to BPLxDAT registers (search for thread related to HAM with less than 6...
Forum: Hardware mods 02 July 2018, 10:16
Replies: 28
Views: 1,863
Posted By pandy71
RGA is internal (chipset) address bus, data are...

RGA is internal (chipset) address bus, data are transferred over shared data bus (shared with CPU). Denise is triggered by Agnus (usually) - some access to RGA works as strobe (so Denise internal...
Forum: support.Hardware 30 June 2018, 13:47
Replies: 41
Views: 1,681
Posted By pandy71
I use something like this:...

I use something like this: https://www.newegg.com/Product/Product.aspx?Item=N82E16817103066 - same form factor is present in many rack mountable blade servers (frequently available for bargain price...
Forum: Hardware mods 30 June 2018, 13:37
Replies: 28
Views: 1,863
Posted By pandy71
Of course - every timing in system will be...

Of course - every timing in system will be different - audio, UART, FDD - not sure how much original chipset can be overclocked - in past i think i was successful to replace original generator with...
Forum: Amiga scene 30 June 2018, 12:23
Replies: 37
Views: 1,837
Posted By pandy71
Thx Toni, so eventually list (of DMAC's used in...

Thx Toni, so eventually list (of DMAC's used in Amiga designs) will be quite short - MC68440* (and similar DMAC from Motorola e.g. 68450, AFAIR it was also 68850 DMAC [not MMU 851] but seem it is...
Forum: Hardware mods 30 June 2018, 11:38
Replies: 28
Views: 1,863
Posted By pandy71
few words from me too. To simplify your design...

few words from me too.
To simplify your design (and make it more robust i.e. higher chance to success) you can generate own pixel clock (you can use programmable generator such Si5351 - it is quite...
Forum: Amiga scene 30 June 2018, 11:15
Replies: 37
Views: 1,837
Posted By pandy71
Yes, indeed, NCR53C710 has implemented MC68K bus...

Yes, indeed, NCR53C710 has implemented MC68K bus timing and logic. So this may explain a lot - if there is DMA on SCSI then or it will use DMAC or SuperDMAC from Commodore, or GVP or NCR chip with...
Forum: Amiga scene 29 June 2018, 17:38
Replies: 37
Views: 1,837
Posted By pandy71
Common but only amongst few main vendors capable...

Common but only amongst few main vendors capable to pay for ASIC or CPLD. There was no cheap DMA controller on MC68k market - 68440 or 68450 was quite expensive and uncommon out of VME world. Some of...
Forum: Amiga scene 28 June 2018, 22:51
Replies: 37
Views: 1,837
Posted By pandy71
Only few SCSI controllers on Amiga use DMA and...

Only few SCSI controllers on Amiga use DMA and then they usually use DMAC from Commodore with DMAC limitations (like 24 bit address bus) - not sure why such approach - perhaps general assumption was...
Forum: Amiga scene 28 June 2018, 19:15
Replies: 37
Views: 1,837
Posted By pandy71
Why "it is too late"? Should be not a big issue...

Why "it is too late"? Should be not a big issue to create DMA controller and implement DMA for PATA. Low speed is outcome of overall available bandwidth within Amiga SoC. Also instead creating HW DMA...
Forum: Amiga scene 28 June 2018, 02:12
Replies: 14
Views: 1,577
Posted By pandy71
As mentioned YUV generation was easier than RGB...

As mentioned YUV generation was easier than RGB and supported by many computers - YUV was easy to generate as it can be created purely in digital domain in simple circuits (as colour information is...
Forum: Amiga scene 28 June 2018, 01:58
Replies: 37
Views: 1,837
Posted By pandy71
Hope you are aware that SATA is fast serial...

Hope you are aware that SATA is fast serial interface (point to point, differential, low voltage multi Gigabit per second) and there is no easy way to interface SATA with old 5V logic. You can use or...
Forum: support.Hardware 23 June 2018, 19:07
Replies: 3
Views: 278
Posted By pandy71
You can't reprogram those chips - they are truly...

You can't reprogram those chips - they are truly MASK ROM - Commodore ordered them from few companies - at the beginning (Kick <2) it was Japan (mostly Hitachi), later (Kick >2?) it was Macronix...
Forum: Hardware mods 10 June 2018, 14:01
Replies: 34
Views: 1,939
Posted By pandy71
This seem to be proper answer - usually this is...

This seem to be proper answer - usually this is button to start and if it keep pressed longer then it perform COLD shutdown (independent from OS).

I agree that 500W is ridiculous and usually...
Forum: support.Hardware 15 May 2018, 22:23
Replies: 9
Views: 417
Posted By pandy71
Not sure but perhaps original PSU using voltage...

Not sure but perhaps original PSU using voltage doubler - this is quite common for US/EU PSU's - they have switch to use PSU in voltage doubler or normal mode - if this is similar for this PSU then...
Forum: support.Other 15 May 2018, 17:08
Replies: 1
Views: 428
Posted By pandy71
If this monitor support CGA then it should work...

If this monitor support CGA then it should work with Amiga - use VGA input as it is proper input for video signal generated by Amiga (analog video) MDA, CGA, EGA are digital signals and they will...
Forum: support.Hardware 14 May 2018, 19:05
Replies: 12
Views: 677
Posted By pandy71
I didn't mean to insult anyone especially...

I didn't mean to insult anyone especially E-Penguin, well yes, i've tried to be funny and a bit of ironic (being from almost 20 years electronics engineer i've had impression that have some basic...
Forum: support.Hardware 13 May 2018, 14:39
Replies: 12
Views: 677
Posted By pandy71
Thank you. So please tell me what makes coil...

Thank you.

So please tell me what makes coil to whine?
Forum: support.Hardware 10 May 2018, 15:13
Replies: 12
Views: 677
Posted By pandy71
Well... please allow me to rewrite correctly your...

Well... please allow me to rewrite correctly your statement: you just ignored weird whining sound and despite malfunction tried to use PSU then after some time PSU just failed completely showing this...
Forum: support.Hardware 08 May 2018, 14:16
Replies: 12
Views: 677
Posted By pandy71
Do so and if sound will be still audible use 2...

Do so and if sound will be still audible use 2 compound resin (epoxy) glue - try to stabilize inductances (transformer and inductors) - few glue drops should be sufficient - after time there is very...
Forum: support.Hardware 07 May 2018, 22:59
Replies: 12
Views: 677
Posted By pandy71
On your side i would also check inductances,...

On your side i would also check inductances, usually those parts are responsible for audible sound not capacitors (capacitors may also produce sound but usually it is way weaker than sound produced...
Forum: Retrogaming General Discussion 30 March 2018, 21:38
Replies: 10
Views: 677
Posted By pandy71
You can also wisely use 16 colours CLUT and...

You can also wisely use 16 colours CLUT and prevent unwanted ramp propagation - CPU intensive but doable especially in time of Vampire and similar accelerators.
Perhaps skilled programmer can do...
Forum: Amiga scene 25 March 2018, 14:38
Replies: 12
Views: 791
Posted By pandy71
You just triggered my curiosity - it sounds like...

You just triggered my curiosity - it sounds like filesystem doesn't allow seek over file...? Is that true?
Forum: Amiga scene 24 March 2018, 16:49
Replies: 12
Views: 791
Posted By pandy71
You may have multiple chunks of data to reduce...

You may have multiple chunks of data to reduce this limitation or use smart resources utilization (small 2 or more buffers and read data from storage - looks like nowadays mass storage is no longer...
Forum: Amiga scene 24 March 2018, 13:19
Replies: 12
Views: 791
Posted By pandy71
For sure it is stereo and there are players (SoX,...

For sure it is stereo and there are players (SoX, ffplay for sure) capable to play 8SVX as stereo (raised bug on this for foobar 2000 https://hydrogenaud.io/index.php/topic,101588.msg838527.html...
Forum: support.Hardware 12 March 2018, 16:01
Replies: 12
Views: 650
Posted By pandy71
Hall sensor are foundation for speed control in...

Hall sensor are foundation for speed control in BLDC (efficiently they replacing mechanical commutator usually attached in fixed way to rotor) - you may control BLDC also using BEMF hover hall sensor...
Forum: Amiga scene 10 March 2018, 09:31
Replies: 203
Views: 24,743
Posted By pandy71
i've converted bellow pictures while ago...

i've converted bellow pictures while ago intentionally for Workbench MUI (colour standard palette + laced hires with small overscan) version - IMHO they looks nice so perhaps they may be useful for...
Forum: Coders. Releases 10 March 2018, 09:03
Replies: 39
Views: 3,216
Posted By pandy71
MPEG 1 Layer I is not used at all IMHO...

MPEG 1 Layer I is not used at all IMHO (practically used and also not directly in DCC as mutated version called PASC) - conformance official bitstreams are available here:...
Forum: Coders. Releases 08 March 2018, 01:52
Replies: 39
Views: 3,216
Posted By pandy71
Opus is merged vorbis + speex (both with...

Opus is merged vorbis + speex (both with improvements) - Opus has many faces (like low latency etc). And at least theoretically it is not affected by patents pool. Anyway mp3 is no longer covered by...
Forum: Coders. Releases 05 March 2018, 16:45
Replies: 39
Views: 3,216
Posted By pandy71
Nice, Thx Meynaf! Any plans for Opus?

Nice, Thx Meynaf! Any plans for Opus?
Forum: Nostalgia & memories 03 March 2018, 14:00
Replies: 51
Views: 2,512
Posted By pandy71
Yes man, Ensoniq use DCO (NCO) and use AWG as...

Yes man, Ensoniq use DCO (NCO) and use AWG as foundation for waveform generation (Paula is unable to skip samples in wavetables - it can only play faster or slower complete wavetable where Ensoniq...
Showing results 1 to 40 of 1653

 
Forum Jump

All times are GMT +2. The time now is 07:38.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Page generated in 0.15057 seconds with 10 queries