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Search: Posts Made By: Stedy
Forum: support.Hardware 25 June 2020, 23:43
Replies: 14
Views: 715
Posted By Stedy
Hi, Download testcard from Aminet: ...

Hi,

Download testcard from Aminet:
http://aminet.net/search?query=testcard

I use that for my Amiga video adaptor work.

Ian
Forum: support.Hardware 22 May 2020, 00:09
Replies: 452
Views: 110,659
Posted By Stedy
Have you got a 3D printer or access to one? ...

Have you got a 3D printer or access to one?

https://www.thingiverse.com/thing:4286979
https://www.thingiverse.com/thing:3562194
That's two neat case designs that allows for the board and the...
Forum: support.Hardware 16 May 2020, 13:30
Replies: 25
Views: 2,047
Posted By Stedy
These wont be newly fabricated parts, they will...

These wont be newly fabricated parts, they will be the original Motorola die, still on wafers. Rochester electronics will remove them from the wafer and package them in a PGA package and datestamp...
Forum: Hardware mods 14 May 2020, 01:16
Replies: 356
Views: 102,332
Posted By Stedy
The current V2.5.2 design has been discontinued....

The current V2.5.2 design has been discontinued. The V3.1 design I have not costed up yet, I have two prototypes, just need to finish the VHDL code for it.

The V3.1 design supports Amiga, PC and...
Forum: support.Hardware 10 May 2020, 12:43
Replies: 452
Views: 110,659
Posted By Stedy
Can you connect a few more grounds? There...

Can you connect a few more grounds?
There should be three grounds for the RGB signals and another sync ground (VGA pin 10). If you separate the digitial sync signals return from the video, you...
Forum: support.Hardware 05 May 2020, 00:44
Replies: 452
Views: 110,659
Posted By Stedy
@rabidgerry When you use the GBSControl...

@rabidgerry

When you use the GBSControl software, does it report the speed that the SDRAM is being operated at?

If you get memory timing marginal in a framebuffer/scanconverter application it...
Forum: Hardware mods 05 May 2020, 00:21
Replies: 23
Views: 3,588
Posted By Stedy
Nice project, the video output looks quite good...

Nice project, the video output looks quite good on the V1 board. How well does it handle moving video?

For the FPGA issues, set all inputs to Schmitt trigger inputs, the Amiga's logic may be too...
Forum: Hardware mods 09 April 2020, 00:04
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Yes, the Agnus chip arrived today. Will...

Hi,

Yes, the Agnus chip arrived today. Will solder it in over the long weekend and start some tests.

@CD32freak

The design is inspired by the original files in terms of layout but the...
Forum: Hardware mods 30 March 2020, 23:32
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Mick has already seen this, current...

Hi,

Mick has already seen this, current build status:

This was before I cleaned the boards, had some 'fun' soldering PLCCs but got there with some flux and hot air gun. Will re-check the solder...
Forum: support.Hardware 04 March 2020, 00:40
Replies: 3
Views: 383
Posted By Stedy
Try this: ...

Try this:
http://teleinfo.pb.edu.pl/krashan/new/removing-aga-display-trashes
Forum: Hardware mods 23 February 2020, 22:50
Replies: 362
Views: 41,144
Posted By Stedy
Build continued today, placed about another 100...

Build continued today, placed about another 100 discretes, topside nearly done, underside has maybe 100-200 more to go. Powered up the board as-is, nothing crazy happened, a good sign, power is...
Forum: Hardware mods 10 February 2020, 23:03
Replies: 362
Views: 41,144
Posted By Stedy
Hi, I plan to start construction on the...

Hi,

I plan to start construction on the first board this week. Will be doing it in a staged process, checking some continuity on the power traces as I go so that if it breaks at a certain point,...
Forum: Hardware mods 10 February 2020, 22:48
Replies: 38
Views: 4,373
Posted By Stedy
@Scrat Have you been working with the same...

@Scrat

Have you been working with the same Mentor Graphics source data that Micha @ Amiga Wiki has been using?

@thread
The original schematics, in Mentor format have been around for years, I...
Forum: Hardware mods 01 February 2020, 14:09
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Board arrived this morning. Have some...

Hi,

Board arrived this morning. Have some assembly to do but it will keep me out of mischief.

I checked the drill sizes of my A600, the signal tracks have 0.45mm drill and the power was...
Forum: Hardware mods 28 January 2020, 00:15
Replies: 362
Views: 41,144
Posted By Stedy
For decoupling, a few primers: ...

For decoupling, a few primers:
https://www.allaboutcircuits.com/technical-articles/clean-power-for-every-ic-part-2-choosing-and-using-your-bypass-capacitors/
...
Forum: Hardware mods 13 January 2020, 01:19
Replies: 362
Views: 41,144
Posted By Stedy
Looks like the _X1M signal is not used. It...

Looks like the _X1M signal is not used. It connects R162 but is not driven by anything.
Don't panic yet. I'm great at fixing impossible problems. :spin
Forum: Hardware mods 10 January 2020, 00:55
Replies: 362
Views: 41,144
Posted By Stedy
I missed the fact that GAYLE drives the _RST...

I missed the fact that GAYLE drives the _RST signal, as I assumed all signals on the left of a schematic symbol were inputs, unless labelled otherwise. I found the document from GAYLE and what...
Forum: Hardware mods 09 January 2020, 00:58
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Still checking through the schematics,...

Hi,

Still checking through the schematics, might have found something. Does the prototype A600 board have a working 6570 Keyboard microprocessor?

If that chip is missing or the 3MHz crystal...
Forum: Hardware mods 07 January 2020, 01:25
Replies: 362
Views: 41,144
Posted By Stedy
The YTRAP should only affect the colour on the...

The YTRAP should only affect the colour on the composite video and the chrominance output of the Y/C (S-video) signal. If the video syncs are present and correct and pixel data is arriving from...
Forum: Hardware mods 02 January 2020, 01:06
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Starting to review the files now, will...

Hi,

Starting to review the files now, will take a few evenings to complete.
What values parts are you using around E120-E129 (EC120-EC129) in your schematics?
They should be 22pF not 22nF.

As...
Forum: Hardware mods 29 December 2019, 16:31
Replies: 362
Views: 41,144
Posted By Stedy
Mick, Where can I download a copy of the PCB...

Mick,

Where can I download a copy of the PCB and associated schematics that match the PCB you had fabricated?

I'll take a look through for any issues, as best I can.

Can you or Acill tell me...
Forum: Hardware mods 20 December 2019, 22:55
Replies: 362
Views: 41,144
Posted By Stedy
@Acill Do you get any colours on startup or...

@Acill

Do you get any colours on startup or just a black screen?

@Mick

Board bringup/testing is the fun part, don't panic yet.

I did review the original layout/schematic you shared,...
Forum: Hardware mods 17 December 2019, 00:15
Replies: 362
Views: 41,144
Posted By Stedy
U49 is a cause. Vin is connected to 0VL, VSS to...

U49 is a cause. Vin is connected to 0VL, VSS to +5V, this causes the device to malfunction, probably holding the CPU in RESET as it links to KB_RESET.
Pop U49 off and see how you go from there.
...
Forum: Hardware mods 18 October 2019, 00:59
Replies: 362
Views: 41,144
Posted By Stedy
Mick, Using PCBShopper, a 4 layer board with...

Mick,

Using PCBShopper, a 4 layer board with gold fingers/hardened edge connector can be yours for the princely sum of £74, for a quantity of 5. These boards are Electroless Nickel Immersion Gold...
Forum: Hardware mods 10 October 2019, 02:40
Replies: 362
Views: 41,144
Posted By Stedy
Is there anything else you need from me? The...

Is there anything else you need from me?
The original Amiga schematics have a weird oscillator device, it is exceptionally rare that the enable pin is connected to ground to enable the device, the...
Forum: support.Hardware 18 September 2019, 00:50
Replies: 4
Views: 278
Posted By Stedy
Hi, Check the solder joints around the...

Hi,

Check the solder joints around the flicker fixer VRAM devices, U470-U475 and U479.

Looking at the pattern, you've got a faulty address pin, one one of the sets of RAM as the disturbance in...
Forum: support.Hardware 18 September 2019, 00:44
Replies: 19
Views: 936
Posted By Stedy
Dumb question, have you tried another video lead?...

Dumb question, have you tried another video lead?

The TV is not seeing horizontal or vertical syncs pulse reliably, hence the picture. The garish colours are due to the TV not locking on and...
Forum: support.Hardware 03 September 2019, 00:52
Replies: 28
Views: 1,962
Posted By Stedy
@klx300r What make and model of ATX power...

@klx300r

What make and model of ATX power supply are you using?
I can't think of any logical reason for it not to work.

@solarmon

The A1000 PSU spec specified that the input frequency of...
Forum: support.Hardware 31 August 2019, 21:08
Replies: 28
Views: 1,962
Posted By Stedy
Hi, Does your micro-ATX PSU have smaller...

Hi,

Does your micro-ATX PSU have smaller orange wires in parallel with the larger ones?
Some ATX supplies use remote sense on the +3.3V motherboard connections, if they get no feedback, the PSU...
Forum: Hardware mods 22 August 2019, 22:35
Replies: 362
Views: 41,144
Posted By Stedy
The PCB outline fits nicely inside the case. ...

The PCB outline fits nicely inside the case.

MT6 needs to move slightly, maybe 1.5mm to the left and 1.5mm down, see the second photo. Not sure about this, the CAD data matches my measurements but...
Forum: Hardware mods 21 August 2019, 23:19
Replies: 362
Views: 41,144
Posted By Stedy
Did you allow for an Electroless Nickel Immersion...

Did you allow for an Electroless Nickel Immersion Gold (ENIG) finish?
The memory expansion connector needs hasrd gold fingers for reliability, this pushes the cost up.

5 PCB with ENIG finish,...
Forum: Hardware mods 20 August 2019, 23:31
Replies: 362
Views: 41,144
Posted By Stedy
Hi, I'm slowly fixing the VCC/GND nets by...

Hi,

I'm slowly fixing the VCC/GND nets by deleting all global symbols that connect to VCC/GND and connecting all devices to VCC/GND symbols. A global symbol overrides a local net name.

I...
Forum: Hardware mods 18 August 2019, 21:14
Replies: 362
Views: 41,144
Posted By Stedy
Hi, I'll upload the project files to Github...

Hi,

I'll upload the project files to Github soon, let me finish the schematic checks and prettying ;) I've nearly fixed the renaming of the Vcc/Gnd nets to U13_1 and U12_1, page by page I'm...
Forum: Hardware mods 17 August 2019, 16:45
Replies: 362
Views: 41,144
Posted By Stedy
Don't know, I checked the measurements 3 times. I...

Don't know, I checked the measurements 3 times. I measured a Rev 2D motherboard. In the zone is a PDF file which contains the measurements of my PCB, can some another A600 owner measure their PCB and...
Forum: Hardware mods 16 August 2019, 16:50
Replies: 362
Views: 41,144
Posted By Stedy
The spacing between tracks is close. With...

The spacing between tracks is close. With 1980s/1990s technology, to a large extent this is ok. Newer technologies from around 2000 onward this would cause issues as the signals are faster, this...
Forum: Hardware mods 16 August 2019, 01:09
Replies: 362
Views: 41,144
Posted By Stedy
Hi, Still checking schematics, so the delay...

Hi,

Still checking schematics, so the delay in releasing files is due to me checking everything! Once schematics are complete, it's on to the PCB. Easily 20-30 hours to check a design like this.
...
Forum: Hardware mods 12 August 2019, 00:31
Replies: 362
Views: 41,144
Posted By Stedy
That looks fine for a AGND/DGND split :great ...

That looks fine for a AGND/DGND split :great
I've found a few errors in the schematics, have not finished the checks yet, will post the list once complete and amended schematics.

I have a few...
Forum: Hardware mods 10 August 2019, 01:21
Replies: 362
Views: 41,144
Posted By Stedy
Hi, AGND is indeed analogue ground. It is...

Hi,

AGND is indeed analogue ground. It is used for the audio circuits and some of the video functions on the A600 (don't have the schematics open to double check). The old school way of doing it...
Forum: Hardware mods 08 August 2019, 23:31
Replies: 362
Views: 41,144
Posted By Stedy
@Mick, To help me with the schematics check,...

@Mick,

To help me with the schematics check, did you use the V1.5 or V2 as your original?

You do realise that the CXA2075 does not give you VGA compatible video timings?
It will give you Y/C...
Forum: Hardware mods 06 August 2019, 21:33
Replies: 362
Views: 41,144
Posted By Stedy
Give me a few days, probably over the weekend and...

Give me a few days, probably over the weekend and I'll check the schematics in full. I'll take a look at the issues quoted above and check them out, I'm quite good with video circuits :crazy Get the...
Showing results 1 to 40 of 677

 
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