English Amiga Board


Go Back   English Amiga Board > Search Forums

Showing results 1 to 40 of 1789
Search took 0.15 seconds.
Search: Posts Made By: pandy71
Forum: Hardware mods Yesterday, 20:20
Replies: 36
Views: 2,711
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: 447
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: 447
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: 36
Views: 2,711
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: 36
Views: 2,711
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: 4,001
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: 447
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: 36
Views: 2,711
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: 192
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: 447
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: 36
Views: 2,711
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: 447
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: 36
Views: 2,711
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: 36
Views: 2,711
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: 36
Views: 2,711
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...
Forum: Hardware mods 20 July 2021, 21:52
Replies: 36
Views: 2,711
Posted By pandy71
Guys but there is IDE connector (16 bit, ready to...

Guys but there is IDE connector (16 bit, ready to use) - in fact Pico could be used in transparent way as: first accelerated IDE controller (byte swap on RP2040) and secondly do some data processing...
Forum: Amiga scene 17 July 2021, 22:47
Replies: 15
Views: 1,405
Posted By pandy71
It has everything as it was made as AGA clone...

It has everything as it was made as AGA clone (Indivision reverse engineered original AGA and added new functionality to it - registers are in $DFF000 space and can be accessed trough Copper). This...
Forum: support.Hardware 12 July 2021, 11:09
Replies: 11
Views: 1,257
Posted By pandy71
You can use ISO 18923:2000 (...

You can use ISO 18923:2000 ( https://www.iso.org/standard/27619.html ) as reference and information bellow:

https://www.digital-scrapbooking-storage.com/floppy-disk-storage.html...
Forum: Amiga scene 12 July 2021, 00:42
Replies: 72
Views: 12,851
Posted By pandy71
This one looks more sensible... Anyway i can...

This one looks more sensible... Anyway i can recommend to raise concerns to particular tax office about improper company behavior (risk violation of the tax law which is very serious crime and tax...
Forum: support.Hardware 10 July 2021, 22:39
Replies: 11
Views: 423
Posted By pandy71
-12V must be -12V that's all, let say with +-10%...

-12V must be -12V that's all, let say with +-10% (+-1.2V) accuracy under normal load (i.e. Amiga operational) so -12V (-13.2V...-10.8V) is OK, everything else is NOK (and PicoPSU seem is able to...
Forum: Amiga scene 10 July 2021, 22:24
Replies: 72
Views: 12,851
Posted By pandy71
"Amiga.net.pl" obviously except "Amiga" in domain...

"Amiga.net.pl" obviously except "Amiga" in domain name has nothing common with Amiga - this site is about nothing, more like honey pot to catch people attention but there is nothing there...
Forum: support.Hardware 09 July 2021, 10:24
Replies: 11
Views: 423
Posted By pandy71
Analog audio part is decoupled by rudimentary RC...

Analog audio part is decoupled by rudimentary RC filter (10 Ohm + 220nF + 22uF) and original PSU is also quite noisy...
Perhaps issue is -12V line as you already suggested...
Anyway multimeter (or...
Forum: support.Hardware 04 July 2021, 00:28
Replies: 5
Views: 378
Posted By pandy71
Unsolder :U56, C82 and C77, also unsolder R86,...

Unsolder :U56, C82 and C77, also unsolder R86, after this check with multimeter power line after (from C77 pad for example) - there should be no load on this line - if line will be still grounded...
Forum: support.Hardware 02 July 2021, 10:19
Replies: 5
Views: 378
Posted By pandy71
Do close inspection for bend pins, some corrupted...

Do close inspection for bend pins, some corrupted components - A2000 is a large MOBO and there is chance that it was mechanically damaged.
After this if nothing found try to search with multimeter...
Forum: Hardware mods 01 July 2021, 11:23
Replies: 58
Views: 6,533
Posted By pandy71
Perhaps but don't get mi wrong - i have more...

Perhaps but don't get mi wrong - i have more faith in people like PurpleMelbourne. At some point replacement for Amiga IC's will be available and i can bet that this will be possible thanks to...
Forum: Hardware mods 30 June 2021, 18:14
Replies: 58
Views: 6,533
Posted By pandy71
No clue and curious same like you - this may be...

No clue and curious same like you - this may be problem to generate Lisa clone (but should be not a problem when Lisa function analogue is created)



Luckily to us we may have some extrapolated...
Forum: Hardware mods 29 June 2021, 22:33
Replies: 58
Views: 6,533
Posted By pandy71
lol - sanded markings... hilarious... i bet same...

lol - sanded markings... hilarious... i bet same can be done with RP2040 (Programmable I/O and DMA made this inexpensive ARM almost ideal for Amiga IC replacement project)
Forum: support.Hardware 28 June 2021, 22:59
Replies: 7
Views: 440
Posted By pandy71
PCB heatbead, protected by some silicone...

PCB heatbead, protected by some silicone rubber/teflon foil/capton film should be ok.
https://reprap.org/wiki/PCB_Heatbed - temp sensor and control can be integrated.
Forum: Hardware mods 28 June 2021, 10:30
Replies: 58
Views: 6,533
Posted By pandy71
CSG was incapable to deliver 35ns performance -...

CSG was incapable to deliver 35ns performance - ECS was already tricky and they need to use tricks as CLUT interleaving (efficiently reduce maximum number of colors to 4 selected from 64 not 4096)....
Forum: Hardware mods 28 June 2021, 01:15
Replies: 58
Views: 6,533
Posted By pandy71
Thx Toni, i should check spec before asking. ...

Thx Toni, i should check spec before asking.
Can't find now source but somebody listed that Lisa 391227-01 has over 225 thousand transistors - this mean it is most complex IC - it has more...
Forum: Hardware mods 27 June 2021, 15:32
Replies: 58
Views: 6,533
Posted By pandy71
As an alternative to FPGA some more affordable...

As an alternative to FPGA some more affordable ASIC approach like https://www.efabless.com/ can be investigated. ASIC are expensive but older technologies (130nm so 5V I/O compliant) is more than...
Forum: support.Hardware 23 June 2021, 10:41
Replies: 2
Views: 433
Posted By pandy71
One missing pin is key to prevent possibility to...

One missing pin is key to prevent possibility to incorrectly insert cable (as pointed by Vypr) - so single pin missing is OK, if two pins missing then best is to replace connector however it should...
Forum: support.Hardware 17 June 2021, 21:33
Replies: 14
Views: 863
Posted By pandy71
In theory this may work unless I/O on KB uC...

In theory this may work unless I/O on KB uC aren't too weak to drive longer line - you can try to reduce number of wires by introducing fast analog multiplexing (like 74HC4051). Perhaps there is...
Forum: Hardware mods 17 June 2021, 09:49
Replies: 58
Views: 6,533
Posted By pandy71
No doubt on 1:1 in first stage. Gary is...

No doubt on 1:1 in first stage.

Gary is simple address decoder so nothing fancy and can be easily replaced even at some point by TTL logic (A1000 can be used as reference).

CIA's are different...
Forum: support.Hardware 16 June 2021, 22:24
Replies: 14
Views: 863
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: 58
Views: 6,533
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: 58
Views: 6,533
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: 58
Views: 6,533
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: 58
Views: 6,533
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: 58
Views: 6,533
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...
Showing results 1 to 40 of 1789

 
Forum Jump

All times are GMT +2. The time now is 04:34.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
Page generated in 0.16411 seconds with 10 queries