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Search: Posts Made By: Stedy
Forum: Hardware mods 13 January 2020, 02:19
Replies: 279
Views: 21,781
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, 01:55
Replies: 279
Views: 21,781
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, 01:58
Replies: 279
Views: 21,781
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, 02:25
Replies: 279
Views: 21,781
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, 02:06
Replies: 279
Views: 21,781
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, 17:31
Replies: 279
Views: 21,781
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, 23:55
Replies: 279
Views: 21,781
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, 01:15
Replies: 279
Views: 21,781
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, 01:59
Replies: 279
Views: 21,781
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, 03:40
Replies: 279
Views: 21,781
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, 01:50
Replies: 4
Views: 243
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, 01:44
Replies: 19
Views: 775
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, 01:52
Replies: 28
Views: 1,515
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, 22:08
Replies: 28
Views: 1,515
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, 23:35
Replies: 279
Views: 21,781
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 22 August 2019, 00:19
Replies: 279
Views: 21,781
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 21 August 2019, 00:31
Replies: 279
Views: 21,781
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, 22:14
Replies: 279
Views: 21,781
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, 17:45
Replies: 279
Views: 21,781
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, 17:50
Replies: 279
Views: 21,781
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, 02:09
Replies: 279
Views: 21,781
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, 01:31
Replies: 279
Views: 21,781
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, 02:21
Replies: 279
Views: 21,781
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 09 August 2019, 00:31
Replies: 279
Views: 21,781
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, 22:33
Replies: 279
Views: 21,781
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...
Forum: Hardware mods 30 July 2019, 01:47
Replies: 279
Views: 21,781
Posted By Stedy
Mick, https://www.amigapcb.org/ Tempted...

Mick,

https://www.amigapcb.org/

Tempted now? :nervous
Forum: support.Hardware 30 July 2019, 01:45
Replies: 3,672
Views: 380,882
Posted By Stedy
You used the wrong RAM width! The original part,...

You used the wrong RAM width! The original part, the MT46V16M16BG is 16Mbit x 16 bit wide = 256Mbit or 32 Mbyte.
The MT46V64M8CV is a 64 Mbit x 8 bit wide = 512Mbit but it is only 8 bits wide, your...
Forum: support.Hardware 14 June 2019, 00:56
Replies: 8
Views: 624
Posted By Stedy
The Mist and Unamiga Video outputs are not...

The Mist and Unamiga Video outputs are not compatible with SCART video inputs. It's the same problem that afflicts real Amigas with SCART, the 'video' sync signal is 2-3x larger than the TV expects....
Forum: support.Hardware 03 May 2019, 01:30
Replies: 3,672
Views: 380,882
Posted By Stedy
Hi, I was discussing with grebfarlk a while...

Hi,

I was discussing with grebfarlk a while ago about a plug in power injector card with PCI riser, with an onboard 3.3V supply and 5V distribution. It would cost around £40-£50 each in small...
Forum: support.Hardware 03 May 2019, 01:21
Replies: 7
Views: 364
Posted By Stedy
Hi, I should have the next batch of Big...

Hi,

I should have the next batch of Big box/original PSU adaptors, with Tick circuit, on sale next week. The 50/60Hz tick signal accuracy was <1Hz, the PIC microcontroller timer takes care of this...
Forum: support.Hardware 28 April 2019, 15:02
Replies: 3,672
Views: 380,882
Posted By Stedy
@Hedeon Can you get a screenshot or photo of...

@Hedeon

Can you get a screenshot or photo of the screen when the graphics driver misbehaves?

A RAM error is a strong possibility here. A photo of the screen can help identify some common RAM...
Forum: support.Hardware 26 April 2019, 02:05
Replies: 3,672
Views: 380,882
Posted By Stedy
Humm, interesting.... I have developed...

Humm, interesting....

I have developed graphics cards for the embedded market. Don't know about the latest cards but Voodoo cards and Radeon 95xx are older tech, some of my knowledge is relevant....
Forum: support.Hardware 26 April 2019, 01:44
Replies: 3,672
Views: 380,882
Posted By Stedy
You don't need anything in the first slot, if...

You don't need anything in the first slot, if that is adjacent to the Logic card as that provides the necessary termination. I'm looking at the install guide on the Elbox website as I write this. I...
Forum: support.Hardware 25 April 2019, 02:16
Replies: 3,672
Views: 380,882
Posted By Stedy
It does indeed need a card in the last slot. If...

It does indeed need a card in the last slot. If there is another PCI device after the last slot, in the old days, a southbridge, you can discount this rule.

PCI is the only reflective wave...
Forum: support.Hardware 20 March 2019, 01:47
Replies: 417
Views: 102,318
Posted By Stedy
It should do. The newer board are labelled up as...

It should do. The newer board are labelled up as 5-12V input. It only uses 0.4@5V or ~0.25A@12V so your supply should be fine.

More info on the boards here:...
Forum: support.Hardware 13 March 2019, 00:35
Replies: 8
Views: 548
Posted By Stedy
The PS2 other consoles and the lowly A520, output...

The PS2 other consoles and the lowly A520, output a correct 1V composite video signal. The Amiga outputs a 4V signal, without the resistor mods! Hence the TV loses signals as it's greater than the...
Forum: support.Hardware 27 January 2019, 15:35
Replies: 12
Views: 1,108
Posted By Stedy
Hi, No mystery, 240p/288p video can't be...

Hi,

No mystery, 240p/288p video can't be used or easily 'faked' to 480p/576p video. YPbPr component video needs a tri-level sync, this could be created (as retro systems do not support this) but...
Forum: support.Hardware 08 January 2019, 01:45
Replies: 48
Views: 1,566
Posted By Stedy
Hi, Can you check the Power Good signal on...

Hi,

Can you check the Power Good signal on the ATX adaptor?
What you describe matches the symptoms of an invalid POWER GOOD/power on reset which the A4000 needs to start up correctly, this is...
Forum: Hardware mods 16 December 2018, 02:08
Replies: 15
Views: 1,664
Posted By Stedy
Sorry it has taken so long to respond, have had...

Sorry it has taken so long to respond, have had to do some research to fully answer the questions. It's not just down to the Fabrication technology, the packaging also has an influence. The 'speed...
Forum: support.Hardware 27 November 2018, 01:24
Replies: 13
Views: 968
Posted By Stedy
Hi, Good progress with the faultfinding....

Hi,

Good progress with the faultfinding. Take a look at pins 43-51 of the Agnus socket, they control the DRAM address. If my diagnosis was correct, they are a likely cause. Any 84 pin socket...
Showing results 1 to 40 of 662

 
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