English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 1814
Search took 0.17 seconds.
Search: Posts Made By: pandy71
Forum: support.Hardware Yesterday, 13:45
Replies: 4
Views: 171
Posted By pandy71
You can modify cable to accommodate composite...

You can modify cable to accommodate composite sync signal from Amiga (replace HSync with CSync) eventually you may try to combine Green with CSync and select on your Sony "Composite on Green" - Issue...
Forum: Coders. Blitz Basic Yesterday, 13:33
Replies: 14
Views: 2,674
Posted By pandy71
Not sure but OS seem to be very limited on...

Not sure but OS seem to be very limited on interlace too so AMOS may have some workarounds on this - not sure why Blitz exhibit some limitations but as it is open source perhaps this area could be...
Forum: support.Hardware 19 October 2021, 18:29
Replies: 7
Views: 289
Posted By pandy71
Combining by simple connecting may lead to...

Combining by simple connecting may lead to muffled audio (combined impedance - resistors + capacitors) also unpowered Amiga may be visible as non linear load (due semiconductor junctions). Ideally...
Forum: Coders. Blitz Basic 19 October 2021, 18:16
Replies: 14
Views: 2,674
Posted By pandy71
Indeed terminology may differ but it is striking...

Indeed terminology may differ but it is striking to me that recommended way to deal with interlace display (set unified frame buffer and use modulo to access fields) is not followed...
Forum: Coders. Blitz Basic 18 October 2021, 19:23
Replies: 14
Views: 2,674
Posted By pandy71
You have single display and two fields - you need...

You have single display and two fields - you need to know which one is Top which one is Bottom and to use interlace correctly you need to remember that fields are draw sequentially (depends on video...
Forum: support.Hardware 15 October 2021, 21:41
Replies: 9
Views: 481
Posted By pandy71
Perhaps they use MOSFET's and some control...

Perhaps they use MOSFET's and some control circuit to enable MOSFET's or perhaps even something more sophisticated like for example...
Forum: support.Hardware 14 October 2021, 16:01
Replies: 9
Views: 481
Posted By pandy71
Use relay(s) to manage power and with single...

Use relay(s) to manage power and with single switch you can control multiple voltages at once.
Forum: Retrogaming General Discussion 08 October 2021, 10:37
Replies: 9
Views: 778
Posted By pandy71
This is not about multiprocessing as driving...

This is not about multiprocessing as driving vector screen could be realized trough series of DMA transfers and some "display list" RAM.

As overall seem Vectrex was made by people with idea and...
Forum: Retrogaming General Discussion 03 October 2021, 23:39
Replies: 9
Views: 778
Posted By pandy71
Not sure why Vectrex use 6809 but you can imagine...

Not sure why Vectrex use 6809 but you can imagine even more 6502 to control critical parts. Perhaps 6809 advantage was better arithmetic capabilities (HW multiplier) - not sure.
Drawing line in...
Forum: support.Hardware 03 September 2021, 23:50
Replies: 18
Views: 1,172
Posted By pandy71
Magnetic is something different than...

Magnetic is something different than electromagnetic (or EMC) - only ferromagnetic material may create shield against magnetic field - aluminum will not work also i doubt if 1080/1084 will be allowed...
Forum: support.Hardware 02 September 2021, 21:53
Replies: 18
Views: 1,172
Posted By pandy71
If issue is related to magnetic field then you...

If issue is related to magnetic field then you need to shield floppy by soft ferromagnetic (definitely not aluminum or copper) sheet of metal - regular shielding is OK for electrostatic but i can...
Forum: Nostalgia & memories 23 August 2021, 00:57
Replies: 17
Views: 2,759
Posted By pandy71
PPC huge market is embedded - automotive, space,...

PPC huge market is embedded - automotive, space, military, networking etc
Forum: support.WinUAE 16 August 2021, 00:23
Replies: 11
Views: 1,584
Posted By pandy71
Well... it is not entirely true - you can...

Well... it is not entirely true - you can simulate scanlines and you can simulate interlace - depends on LCD with small or bigger penalties but still doable - you need only dedicated SW/HW to do so.
Forum: Graphics 16 August 2021, 00:06
Replies: 12
Views: 1,988
Posted By pandy71
Ok, 4 pictures to illustrate "data flow" 24...

Ok, 4 pictures to illustrate "data flow"

24 bit, 12 bit uniform RGB space , 16 color but 24 bit RGB space, 16 color @ uniform 12 bit RGB space.
Forum: Graphics 15 August 2021, 14:31
Replies: 12
Views: 1,988
Posted By pandy71
My fav pixel editor on PC is mtpaint -...

My fav pixel editor on PC is mtpaint - http://mtpaint.sourceforge.net/download.html
side to this i use Gimp (particularly useful Dither where 12 bit color uniform color quantization can be...
Forum: support.WinUAE 12 August 2021, 20:07
Replies: 11
Views: 1,584
Posted By pandy71
Side to UTVideo you may give a chance to: ...

Side to UTVideo you may give a chance to:
https://www.videohelp.com/software/Grass-Valley-HQX-Codec
https://www.videohelp.com/software/Avid-DNxHD

all designed for fast minimal loss/no loss...
Forum: Hardware mods 12 August 2021, 17:15
Replies: 56
Views: 7,849
Posted By pandy71
Depends - PIO is capable to shift IN or shift OUT...

Depends - PIO is capable to shift IN or shift OUT up to 32 bits over single pin automatically (embedded programmable primitive SERDES) as such using shift register you can connect parallel bus to...
Forum: Hardware mods 12 August 2021, 16:49
Replies: 56
Views: 7,849
Posted By pandy71
Well, it is not about changing your mind - it is...

Well, it is not about changing your mind - it is about having discussion based on facts. So whenever somebody placing equal sign between RP2040 and other uC with ARM core (not equipped with something...
Forum: Hardware mods 11 August 2021, 23:43
Replies: 56
Views: 7,849
Posted By pandy71
Obviously you don't understand difference between...

Obviously you don't understand difference between regular ARM core uC and RP2040 - only TI offer something like PIO in RP2040 (TI is more flexible and complex) - RP2040 offer real time capability in...
Forum: Hardware mods 03 August 2021, 23:30
Replies: 56
Views: 7,849
Posted By pandy71
Forgot about one thing that was used out of Amiga...

Forgot about one thing that was used out of Amiga world but it is very tempting idea to try it also in Amiga - Edsun CEG RAMDAC (later Edsun was acquired by Analog Devices and technology was used to...
Forum: Hardware mods 02 August 2021, 09:57
Replies: 56
Views: 7,849
Posted By pandy71
Initially original Raspberry Pi Pico board has...

Initially original Raspberry Pi Pico board has best price/capability ratio - target would be dedicated board(s) for Amiga that can be easily inserted to IC's sockets.

And there is many boards with...
Forum: Hardware mods 01 August 2021, 11:40
Replies: 56
Views: 7,849
Posted By pandy71
I agree with you so no need to explain - just...

I agree with you so no need to explain - just pointed that any USB host capable uC can do this and current USB stack in RP2040 seem to have some problems so perhaps using something more mature like...
Forum: Hardware mods 30 July 2021, 23:38
Replies: 56
Views: 7,849
Posted By pandy71
Checked link after your earlier post - IMHO this...

Checked link after your earlier post - IMHO this doesn't require RP2040 and any USB host capable uC can do this - PIO gives us opportunity to interface things directly to Amiga bus that's why RP2040...
Forum: Hardware mods 30 July 2021, 11:55
Replies: 56
Views: 7,849
Posted By pandy71
Then perhaps i don't get correctly your idea - if...

Then perhaps i don't get correctly your idea - if your goal is to emulate some functionality but use existing Amiga IC's (so you simulate at normal Amiga ports signals of external devices) or you use...
Forum: Hardware mods 30 July 2021, 11:15
Replies: 56
Views: 7,849
Posted By pandy71
Endianess can be changed at HW level IMHO - not...

Endianess can be changed at HW level IMHO - not sure on efficient SW ARM implementation.



In Amiga this is very slow bus (as for today standards 280ns cycle is very slow).



not sure about...
Forum: Hardware mods 29 July 2021, 20:20
Replies: 56
Views: 7,849
Posted By pandy71
Should be possible without problems - worst case...

Should be possible without problems - worst case is A2024 emulation as this is case where frame memory is almost mandatory but perhaps using external DRAM this could be workarounded somehow (perhaps...
Forum: support.Hardware 28 July 2021, 23:20
Replies: 11
Views: 952
Posted By pandy71
True but you can connect pullup to 5V - question...

True but you can connect pullup to 5V - question is about RPI GPIO capability to sink current - that's why i prefer to use optocoupler - substantially simplify circuit, remove issue with different...
Forum: support.Hardware 27 July 2021, 18:31
Replies: 11
Views: 952
Posted By pandy71
Single PNP transistor can be used as in orginal...

Single PNP transistor can be used as in orginal Amiga schematic but negative logic (i.e. 1 disable LED and 0 enable LED) and pullup resistor required but still IMHO best way (RPi safe) is to use...
Forum: Hardware mods 27 July 2021, 18:13
Replies: 56
Views: 7,849
Posted By pandy71
Once again - doubt if lack of MFM will made...

Once again - doubt if lack of MFM will made substantial issue for Paula - floppy is affected by mechanical issues (changes in RPM, different RPM etc), for RP2040 digital stream where you have...
Forum: Hardware mods 26 July 2021, 21:43
Replies: 56
Views: 7,849
Posted By pandy71
Paula can work without MFM (for example can use...

Paula can work without MFM (for example can use GCR) - this need to be verified but as transmission will be from stable source this should be possible (i.e. 500kbps RAW data)
25KB buffer should...
Forum: Coders. General 25 July 2021, 15:08
Replies: 43
Views: 6,322
Posted By pandy71
ICS doesn't have EHB mode - 6 bitplanes was...

ICS doesn't have EHB mode - 6 bitplanes was obviously for HAM and in OCS providing EHB (engineer way of thinking: we have only 32 color registers but 6 bitplanes and we don't want use HAM - what to...
Forum: support.Hardware 25 July 2021, 12:59
Replies: 11
Views: 952
Posted By pandy71
This is more about how to power LED (you need at...

This is more about how to power LED (you need at least 5V) - easiest and safest too for RPi is optocoupler - as optocoupler LED is usually IR then forward voltage is bellow 2V - fine from RPi...
Forum: Hardware mods 24 July 2021, 20:41
Replies: 56
Views: 7,849
Posted By pandy71
nope...

nope http://amiga-dev.wikidot.com/hardware:adkconr

You have 2 or 4uS i.e. 500 or 250 kbps RAW i.e. 250 or 125kbps MFM.



I see now - we thinking on this from two different perspective - me...
Forum: support.WinUAE 24 July 2021, 00:30
Replies: 0
Views: 565
Posted By pandy71
DCTV status

Hello Toni, what is current DCTV emulation status?

Last DCTV was mentioned here http://eab.abime.net/showpost.php?p=1036547&postcount=133 .
Not sure if this can be helpful but seems DCTV images...
Forum: support.Hardware 23 July 2021, 23:56
Replies: 11
Views: 952
Posted By pandy71
doubt on 200mA - this looks like ordinary 20mA...

doubt on 200mA - this looks like ordinary 20mA LED also 200mA LED's in 80/90 was usually unavailable for visible light devices (this kind of current was nothing unusual for GaAs IR LED's)
200mA...
Forum: Hardware mods 23 July 2021, 23:10
Replies: 56
Views: 7,849
Posted By pandy71
nope - 25Kb per track and 160 tracks gives you...

nope - 25Kb per track and 160 tracks gives you 4MB RAW MFM floppy capacity i.e. something more common as 2.88MB floppy not 1.44MB - (SD is 125kbps, DD is 250kbps and HD is 500kbps, there was also ED...
Forum: support.Hardware 23 July 2021, 15:30
Replies: 11
Views: 952
Posted By pandy71
Can't provide anything useful but if i recall...

Can't provide anything useful but if i recall correctly this is generic 2 LED's connected in series - so assume double voltage and current bellow 20mA.
Forum: Hardware mods 23 July 2021, 15:15
Replies: 56
Views: 7,849
Posted By pandy71
Paula transfer RAW bitstream with speed of...

Paula transfer RAW bitstream with speed of 500kbps (for 250kbps MFM), floppy spin 300 revolution per second, simple math - 300/60=5 revolution per second i.e. single revolution per 200ms, if RAW...
Forum: Hardware mods 21 July 2021, 21:14
Replies: 56
Views: 7,849
Posted By pandy71
Gary in terms of the floppy has nothing to do...

Gary in terms of the floppy has nothing to do except simple logic to control motor. Data from Paula can be stored partially (FIFO) in Pico (it has 264KB of RAM where required maximum amount of RAM to...
Forum: Hardware mods 21 July 2021, 11:30
Replies: 56
Views: 7,849
Posted By pandy71
Well, this could be Akiko Plus with some elements...

Well, this could be Akiko Plus with some elements of the primitive GPU (like transformations, interpolation, color space conversion etc), i bet way faster than MC68060 capability... Pico has...
Showing results 1 to 40 of 1814

 
Forum Jump

All times are GMT +2. The time now is 22:05.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.17509 seconds with 10 queries