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Search: Posts Made By: Stedy
Forum: support.Hardware 23 May 2018, 00:27
Replies: 2,078
Views: 187,372
Posted By Stedy
Slowly. The lack of interest has slowed...

Slowly.

The lack of interest has slowed things a little. The PMC adaptors are not cheap to produce and withe little interest (I think 4 people confirmed interest), it's difficult to justify the...
Forum: Hardware mods 02 May 2018, 00:04
Replies: 3,277
Views: 257,503
Posted By Stedy
Can you add a 3.3V regulator and use logic that...

Can you add a 3.3V regulator and use logic that operates from +3.3V but is 5V tolerant?

Taken from the Compact Flash spec:
http://www.ianstedman.co.uk/downloads/Cflash-electrical.png


Compact...
Forum: Hardware mods 29 April 2018, 22:35
Replies: 354
Views: 87,087
Posted By Stedy
Hi, The V2.5 adaptor is now on sale again...

Hi,

The V2.5 adaptor is now on sale again and ready to ship, order here, http://www.ianstedman.co.uk/Sales/sales.html.

Spent some time today verifying the new batch. This involves booting some...
Forum: Hardware mods 26 April 2018, 00:18
Replies: 3,277
Views: 257,503
Posted By Stedy
Hi, Alternative parts are: SN74LVCR16245A ...

Hi,

Alternative parts are:
SN74LVCR16245A
SN74LVCR162245A
SN74LVT162245

They are available from Texas Instruments, OnSemi and Nexperia. The '2245 has 22/30R series terminator to damp the...
Forum: Hardware mods 23 April 2018, 14:15
Replies: 3,277
Views: 257,503
Posted By Stedy
I don't know this exact circuit to comment in...

I don't know this exact circuit to comment in detail. The 74AC16245 is meant to drive a 21 slot VME backplane and switches fast. I could recommend some alternatives if that is in the signal path in...
Forum: Hardware mods 23 April 2018, 01:09
Replies: 3,277
Views: 257,503
Posted By Stedy
Hi, Have your tried lowering the output slew...

Hi,

Have your tried lowering the output slew rate as it sounds like you've got ground bounce?

In the UCF file try something like this:

NET "CBREQ" LOC="46" SLEW=Slow;
By default the...
Forum: Hardware mods 16 April 2018, 00:14
Replies: 354
Views: 87,087
Posted By Stedy
As stated on my website, end of April they will...

As stated on my website, end of April they will be available. Currently have the batch of 75 in the workshop, need to verify the design, then test, and package the first batch of 12 ready for sale.
Forum: support.Hardware 13 April 2018, 00:11
Replies: 2,078
Views: 187,372
Posted By Stedy
Hi again, For the riser card, original idea...

Hi again,

For the riser card, original idea was to plug the PPC card into it and power it but I can make the converter run in parallel with the 3.3V converter on the mediator.

For the PMC card,...
Forum: support.Hardware 12 April 2018, 22:59
Replies: 2,078
Views: 187,372
Posted By Stedy
Ok, I've done some detailed estimating for this,...

Ok, I've done some detailed estimating for this, want to see what the reaction is before proceeding further.

A PCI riser card, with a PCI straddle mount connector and 3.3V, 12A converter would...
Forum: support.Hardware 05 April 2018, 00:53
Replies: 2,078
Views: 187,372
Posted By Stedy
How do you know the whole 3.3V supply capacity is...

How do you know the whole 3.3V supply capacity is used, have you measured the input current to the regulator?
For a linear regulator, input current = output current.

On the Sonnet, the 3.3V...
Forum: support.Hardware 04 April 2018, 13:17
Replies: 2,078
Views: 187,372
Posted By Stedy
The CPU would crash with a machine check...

The CPU would crash with a machine check exception as it had executed invalid instructions from RAM.

RAM setup/timing issues can manifest themselves in many ways, at different times.
Examples...
Forum: support.Hardware 04 April 2018, 01:19
Replies: 2,078
Views: 187,372
Posted By Stedy
Yes. All DRAM (upto and including DDR3) has this...

Yes. All DRAM (upto and including DDR3) has this initialise the part and wait 200us requirement.

The other register to be careful of is the PMCR2, which controls a DLL but if you're not using...
Forum: support.Hardware 03 April 2018, 23:45
Replies: 2,078
Views: 187,372
Posted By Stedy
Hi, Am I understanding the Sonnetlib code...

Hi,

Am I understanding the Sonnetlib code correctly, is https://github.com/Sakura-IT/SonnetAmiga/blob/master/sonnetlib/setupppc.p the code used to initialise the PPC and TSI107?

If it is,...
Forum: Hardware mods 28 March 2018, 00:24
Replies: 86
Views: 7,260
Posted By Stedy
Hi, If you copied my circuit exactly (using...

Hi,

If you copied my circuit exactly (using the 1G97 devices) what did you set the jumper to?

Jumper off = Minimig SCART with CSYNC for a TV or GBS-8200.
Jumper on = regular H/V Sync for an...
Forum: support.Hardware 24 March 2018, 00:24
Replies: 2,078
Views: 187,372
Posted By Stedy
Any idea how much current you need on +3.3V? ...

Any idea how much current you need on +3.3V?

Do you have details of the PowerPC cards you're looking at?

If I know the PowerPC variant and amount of RAM (assuming SDRAM), I can get a good...
Forum: support.Hardware 23 March 2018, 01:06
Replies: 2,078
Views: 187,372
Posted By Stedy
That order is not guaranteed to work as...

That order is not guaranteed to work as technically, it violates one of the PCI system design rules. The last slot in a PCI system must have a card or diode termination. It's easier and cheaper to...
Forum: Hardware mods 14 March 2018, 21:59
Replies: 86
Views: 7,260
Posted By Stedy
Hi, Connect pin 10 of the PIC16F628 to...

Hi,

Connect pin 10 of the PIC16F628 to ground and try again.
Factory fresh, the PIC16F628 supports Low Voltage Programming (LVP) entry to which is controlled by the LVP/PGM pin, which happens to...
Forum: support.Hardware 03 March 2018, 01:11
Replies: 6
Views: 273
Posted By Stedy
I found this a while ago: Budgie is a...

I found this a while ago:


Budgie is a chip that serves as the main data path element in the
A1200 system. It provides the interface between the 32-bit processor
bus and the 32-bit chip...
Forum: Hardware mods 23 February 2018, 18:10
Replies: 3,277
Views: 257,503
Posted By Stedy
Humm, a neat all in one solution. Two...

Humm, a neat all in one solution.

Two things to consider if it does not work in your application.
1) Does the 1.8V supply rise before the +3.3V or is it in parallel with +3.3V?
2) The clock...
Forum: support.Hardware 11 February 2018, 14:55
Replies: 2,078
Views: 187,372
Posted By Stedy
The MPC8248 has different configuration registers...

The MPC8248 has different configuration registers and memory map to the MPC107+PowerPC 603/PowerPC 750 you've been looking at. The MPC107 has PCI mapped config registers, the MPC8248 has the config...
Forum: Hardware mods 30 January 2018, 23:36
Replies: 354
Views: 87,087
Posted By Stedy
Hi, You may get away with just plugging a...

Hi,

You may get away with just plugging a regular PC drive into the adaptor board of the external drive. When the Sony drive failed in my Amitek external drive, I fitted another drive, just plug...
Forum: support.Hardware 29 January 2018, 00:27
Replies: 7
Views: 495
Posted By Stedy
Hi, I checked the Hantek 6022BE specs, it's...

Hi,

I checked the Hantek 6022BE specs, it's bandwidth is 20MHz and it samples at 48 Megasamples/sec. This should show a 7 MHz clock signal, you mey not see the detail of the edges but it will show...
Forum: Hardware mods 29 January 2018, 00:17
Replies: 354
Views: 87,087
Posted By Stedy
I've sold a couple hundred adaptors, tested with...

I've sold a couple hundred adaptors, tested with various PC floppy drives over the last 10 years and it's the first time both ground pins have been needed.

Glad everything else is working fine.
Forum: support.Hardware 29 January 2018, 00:10
Replies: 24
Views: 793
Posted By Stedy
Hi, The Apple IIe PAL/NTSC output has the...

Hi,

The Apple IIe PAL/NTSC output has the colour carrier signal, controlled by UB8 in the schematics. If you feed this into a video chip expecting a non composite video signal, you will have a...
Forum: support.Hardware 22 January 2018, 23:39
Replies: 24
Views: 793
Posted By Stedy
Hi, The attached circuit will convert RGB to...

Hi,

The attached circuit will convert RGB to YPbPr but if you use the Y part, circled in Blue, you'll have a lumuinance signal. I grabbed the circuit from here:...
Forum: Hardware mods 04 November 2017, 20:39
Replies: 3,389
Views: 232,517
Posted By Stedy
I bought one of them to play with, opened it up...

I bought one of them to play with, opened it up (I'm an Engineer, it's what I do), and saw that it only accepts composite video. The RGB select on pin 16 of the SCART, had no pull down resistor....
Forum: Hardware mods 04 November 2017, 12:54
Replies: 3,389
Views: 232,517
Posted By Stedy
Your SCART lead is wired incorrectly then. You've...

Your SCART lead is wired incorrectly then. You've been viewing the video image via the composite video image, hence the fuzziness. Pin 16 of the SCART ug needs 1-3V to select RGB mode, without this...
Forum: Hardware mods 02 November 2017, 23:43
Replies: 3,389
Views: 232,517
Posted By Stedy
Why don't you try just the luminance information...

Why don't you try just the luminance information from E281C?

You do not have CSYNC, CSYNC is a TTL level signal (>2V), what you have is composite video, which contains luminance and colour...
Forum: Hardware mods 25 October 2017, 22:55
Replies: 3,389
Views: 232,517
Posted By Stedy
Can you try a buffered IDE interface between the...

Can you try a buffered IDE interface between the TF328 and your adaptor?

On paper (ok PDF specs) the Amiga and Compact Flash cards are not compatible. Type 1 Compact Flash cards (3.3mm thick) when...
Forum: Hardware mods 25 October 2017, 22:48
Replies: 3,389
Views: 232,517
Posted By Stedy
Without seeing the source code, I an only provide...

Without seeing the source code, I an only provide information from my experiences in this area. If you get the handshaking wrong, it either does not work or you get odd codes (had this recently)....
Forum: Hardware mods 20 October 2017, 00:37
Replies: 3,389
Views: 232,517
Posted By Stedy
I loaded the files into MPLAB. At address...

I loaded the files into MPLAB.

At address 2007 of the Flash (config word) you should have a value of 0x3F10.

Try connecting pin RB4/pin 10 to ground to ensure you disable Low Voltage...
Forum: Hardware mods 19 October 2017, 21:13
Replies: 3,389
Views: 232,517
Posted By Stedy
What PIC device is it? Some of the 10F and...

What PIC device is it?

Some of the 10F and 12F devices have oscillator calibration values, which overwritten, make the part appear dead. They can be recovered. If you can point me to the hex file,...
Forum: Hardware mods 18 October 2017, 23:10
Replies: 3,389
Views: 232,517
Posted By Stedy
Hi, With regard to IDE LEDs, if a rev 2...

Hi,

With regard to IDE LEDs, if a rev 2 TF328 is made, connect pin 39 of the IDE connector to pin 126 of the edge connector, then the CD activity light will also double as the IDE activity light....
Forum: Hardware mods 17 October 2017, 00:38
Replies: 3,389
Views: 232,517
Posted By Stedy
Hi, I've uploaded the full RGB circuit for a...

Hi,

I've uploaded the full RGB circuit for a riser card and my un-tested riser card design, based on Plasmab's here: https://github.com/istedman/cd32_breakout

It's GPL like the original. Use it...
Forum: support.Hardware 16 October 2017, 23:49
Replies: 7
Views: 417
Posted By Stedy
Yep, back in 1997! I used the IBMKEY25 design...

Yep, back in 1997! I used the IBMKEY25 design from Aminet (search for epic13), using a PIC16C84. This converted the PS/2 protocol to the Amiga protocol.

I tried converting the design to the...
Forum: Hardware mods 13 October 2017, 23:07
Replies: 3,389
Views: 232,517
Posted By Stedy
Hi, the Epson RTC-72423 should work, based on a...

Hi, the Epson RTC-72423 should work, based on a quick datasheet comparison. It was on the BOM for Hermes.
Forum: Hardware mods 06 October 2017, 00:48
Replies: 3,389
Views: 232,517
Posted By Stedy
Hi, Providing you are doing the continual...

Hi,

Providing you are doing the continual refreshes and not read/writing RAM locations for 200us, you should be fine. SDRAM is subtly different to EDO RAM, you load settings into mode registers,...
Forum: Hardware mods 06 October 2017, 00:03
Replies: 3,389
Views: 232,517
Posted By Stedy
In you latest code, did you take account of this...

In you latest code, did you take account of this from the startup requirements in the datasheets:
An initial pause of 200us is required after power-up followed by any 8 RAS-only refresh or...
Forum: Hardware mods 28 September 2017, 20:07
Replies: 3,389
Views: 232,517
Posted By Stedy
Smile Any ram that has the extra address pins and a 4k...

Any ram that has the extra address pins and a 4k refresh will not work, also Oktoberfest beers are sweet .:crazy

The extra address pins will randomly change state if there is enough noise. This is...
Forum: Hardware mods 12 September 2017, 00:03
Replies: 3,389
Views: 232,517
Posted By Stedy
Maybe the reason for so many RAM problems is the...

Maybe the reason for so many RAM problems is the PCB spacing. With 6-6-6 spacing and a ground plane ~55mils from the signal, crosstalk will be extremely high....
Showing results 1 to 40 of 603

 
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