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Search: Posts Made By: Stedy
Forum: support.Hardware 16 March 2021, 01:05
Replies: 16
Views: 1,539
Posted By Stedy
Hi, Assuming I've byte reversed correctly,...

Hi,

Assuming I've byte reversed correctly, the status registers indicated that the graphics card had a parity error on a transfer and the processor detected it and set a master abort.

Looking...
Forum: Hardware mods 27 February 2021, 16:09
Replies: 466
Views: 62,743
Posted By Stedy
I removed the original design from Github. The...

I removed the original design from Github. The design on Github is 100% working.

The confusion about the serial port came from myself. On my board, I have no working serial port as the CPU cannot...
Forum: Hardware mods 24 February 2021, 00:41
Replies: 466
Views: 62,743
Posted By Stedy
I plan to try the BPF at the weekend. Not sure if...

I plan to try the BPF at the weekend. Not sure if I could make them retrofit existing PCBs, will see how small I can make it.

The original board is not working due to U26/U27 not passing the data...
Forum: Hardware mods 23 February 2021, 00:39
Replies: 466
Views: 62,743
Posted By Stedy
Mick, Send me the files for the board you...

Mick,

Send me the files for the board you have working, I'll upload them to github and I'll start the support Wiki, I have a few entries to add. From here, other users can take the designs, create...
Forum: Hardware mods 22 February 2021, 23:14
Replies: 466
Views: 62,743
Posted By Stedy
Hi, C7, C8, C28 were all 10nF. Have not had...

Hi,

C7, C8, C28 were all 10nF. Have not had a chance to trial the delay line or bandpass filter design with real hardware.

Mick, you've done a 1:1 board, that's one of the boards I've been...
Forum: Hardware mods 19 February 2021, 00:20
Replies: 466
Views: 62,743
Posted By Stedy
Thanks, that came in handy. I designed a Bandpass...

Thanks, that came in handy. I designed a Bandpass filter today, something to do in my lunch break. I ran it through LTSpice, it appeared to work Ok. The delay line was also designed but the simulator...
Forum: Hardware mods 16 February 2021, 23:46
Replies: 466
Views: 62,743
Posted By Stedy
Hi, Mick, I'll check those capacitors in the...

Hi,

Mick, I'll check those capacitors in the next day or two and confirm the results. I could design a delay line for the video circuit quite easily, for the bandpass filter, I need to know how...
Forum: Hardware mods 07 February 2021, 21:31
Replies: 466
Views: 62,743
Posted By Stedy
Hi, I made some more progress with the board...

Hi,

I made some more progress with the board this weekend, it now reads from the Kickstart ROM! I ended u doing a continuity check of every pin of the CPU to a point somewhere on the PCB. When I...
Forum: support.Hardware 05 February 2021, 12:57
Replies: 16
Views: 1,539
Posted By Stedy
Hi, From what you describe, the PowerPC...

Hi,

From what you describe, the PowerPC processor has had a critical fault, on some PPC devices, this is a machine check exception. Have seen this in my day job, the CPU core would hand up but...
Forum: support.Hardware 03 February 2021, 22:54
Replies: 16
Views: 1,539
Posted By Stedy
Hi, Interested in the PCI Command and Status...

Hi,

Interested in the PCI Command and Status registers, latency timer, cache line, interrupt line/pin, MIN grant, MAX LAT and the base address registers.
It's also useful to know what memory...
Forum: support.Hardware 03 February 2021, 13:13
Replies: 16
Views: 1,539
Posted By Stedy
Hi, I'll try my best. Do you have something...

Hi,

I'll try my best. Do you have something equivalent to "lspci" on the Amiga?
This is useful as itprettifies and prints the PCI config registers of every device and is a good starting point.
Forum: Hardware mods 30 January 2021, 16:03
Replies: 466
Views: 62,743
Posted By Stedy
@Mick, Still no luck with my board. One more...

@Mick,

Still no luck with my board. One more trick to try to see if the processor will boot, then I'll check all connections from CPU to ROM in case I damaged something by having the ROM...
Forum: Hardware mods 13 January 2021, 00:14
Replies: 466
Views: 62,743
Posted By Stedy
Hi Mick, Let's start with the soldering...

Hi Mick,

Let's start with the soldering first.
Sometimes, adding fresh solder makes removal easier as the flux from the fresh solder helps to melt the joint, which has potentially oxidised. I...
Forum: Hardware mods 12 January 2021, 00:14
Replies: 466
Views: 62,743
Posted By Stedy
Damn, you've got further than me! Kickstart 3.1...

Damn, you've got further than me!
Kickstart 3.1 has up to 20 second delay for floppy drive before the kickstart screen shows?
The A600 does not have a DAC, that's the A1200. It uses a resistor...
Forum: Hardware mods 03 January 2021, 12:24
Replies: 466
Views: 62,743
Posted By Stedy
Hi, I checked _KBRESET, it stays low for...

Hi,

I checked _KBRESET, it stays low for 600ms after application of power, then goes high, this is expected operation. The _HLT signal is at logic 1, expected as it only has a pull-up resistor.
...
Forum: Hardware mods 30 December 2020, 22:53
Replies: 466
Views: 62,743
Posted By Stedy
Nearly end of the year, time for an update. ...

Nearly end of the year, time for an update.

I've spent a fair few hours the last three days working on the first prototype. It doesn't work yet but I've learnt a few things on the way.

My first...
Forum: Hardware mods 30 November 2020, 23:31
Replies: 9
Views: 1,223
Posted By Stedy
Currently completely out of stock of those...

Currently completely out of stock of those adaptors. Was looking to re-order most of the adaptors but suspended all sales earlier this year due to Covid 19.
I live in London, which was the hotspot...
Forum: support.Hardware 27 October 2020, 00:04
Replies: 31
Views: 1,420
Posted By Stedy
Hi, Dumb question, do you have any of pins...

Hi,

Dumb question, do you have any of pins 17-25 of the parallel port connected to your board?

If we can't get the strobe signal to go lower than 0.8V, the conversion will not be started.

Do...
Forum: support.Hardware 16 October 2020, 19:26
Replies: 31
Views: 1,420
Posted By Stedy
Hi, Were you aware of the Open Amiga Sampler...

Hi,

Were you aware of the Open Amiga Sampler project?
Neither was I until a quick search for similar circuits, https://github.com/echolevel/open-amiga-sampler

You could copy their schematic,...
Forum: support.Hardware 13 October 2020, 23:31
Replies: 31
Views: 1,420
Posted By Stedy
Hi Jake, What I'm about to post below, will...

Hi Jake,

What I'm about to post below, will seem a little bit like a teachers review of your design, please take it in the spirit of I saw a few things and I corrected them. I've been doing...
Forum: Hardware mods 13 October 2020, 22:40
Replies: 466
Views: 62,743
Posted By Stedy
The files I'm working with, which match the PCBs...

The files I'm working with, which match the PCBs I have are on Github, admittedly only uploaded yesterday:
https://github.com/istedman/A600Reborn

The board needs testing still, it's on my todo...
Forum: support.Hardware 13 October 2020, 00:07
Replies: 31
Views: 1,420
Posted By Stedy
How did you measure the /STROBE signal and did...

How did you measure the /STROBE signal and did you have a nice short ground lead or the typical 75-120mm ground lead?

With a fast edge and a bad grounding arrangement, the signal will look utter...
Forum: Hardware mods 01 October 2020, 00:40
Replies: 466
Views: 62,743
Posted By Stedy
Hi, Nice work on the board Mick, I must...

Hi,

Nice work on the board Mick, I must finish testing the first design!
Can you move the RAM chips 5-6mm apart?
Soldering J-lead devices is tricky and with the lack of room, it was tricky even...
Forum: support.Hardware 25 June 2020, 23:43
Replies: 14
Views: 839
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: 117,192
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: 2,443
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: 105,422
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: 117,192
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: 117,192
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: 4,505
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: 466
Views: 62,743
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: 466
Views: 62,743
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: 479
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: 466
Views: 62,743
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: 466
Views: 62,743
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: 5,488
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: 466
Views: 62,743
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: 466
Views: 62,743
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: 466
Views: 62,743
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: 466
Views: 62,743
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...
Showing results 1 to 40 of 700

 
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