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Search: Posts Made By: Stedy
Forum: support.Hardware 27 November 2018, 01:24
Replies: 13
Views: 598
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...
Forum: support.Hardware 19 November 2018, 22:55
Replies: 13
Views: 598
Posted By Stedy
Hi, Links to a few faultfinding guide on my...

Hi,

Links to a few faultfinding guide on my website, first the A500/A2000 troubleshooter:
http://www.ianstedman.co.uk/downloads/a5kts1.jpg
http://www.ianstedman.co.uk/downloads/a5kts2.gif
...
Forum: support.Hardware 18 November 2018, 01:50
Replies: 13
Views: 598
Posted By Stedy
Hi, You have a defective solder joint on one...

Hi,

You have a defective solder joint on one of the address lines to the DRAM. The regular pattern of the stippling indicates it is a higher bit. If the RAM can not be read from or written to...
Forum: Hardware mods 17 November 2018, 02:28
Replies: 13
Views: 703
Posted By Stedy
The C64 custom chips made by MOS technologies are...

The C64 custom chips made by MOS technologies are susceptible to Thermal runaway, something that afflict any device made using NMOS/PMOS fabrication technology. MOS semiconductors (as a technology,...
Forum: support.Hardware 13 October 2018, 17:56
Replies: 42
Views: 2,559
Posted By Stedy
Hi, The MC68EC0202 parts I have are 16 MHz...

Hi,

The MC68EC0202 parts I have are 16 MHz parts, photo attached. I have 5 of them, it was for an accelerator project that did not happen. I bought them from an Amiga repairer a few years ago...
Forum: support.Hardware 12 October 2018, 23:46
Replies: 42
Views: 2,559
Posted By Stedy
Hi, I might have 3 or 4 genuine Motorola...

Hi,

I might have 3 or 4 genuine Motorola EC020s in my store of parts, will check tomorrow. Would you be interested?

The last 68EC020s were shipped 31st May 2012,...
Forum: support.Hardware 07 October 2018, 21:35
Replies: 2,873
Views: 268,648
Posted By Stedy
Hi, Can pciInfo, or another command read the...

Hi,

Can pciInfo, or another command read the command/status registers of each PCI device?
The status register will tell you if a master abort, target abort, parity error or system error has...
Forum: Hardware mods 25 August 2018, 00:26
Replies: 164
Views: 14,018
Posted By Stedy
Impressive work. The composite video output...

Impressive work.

The composite video output looks quite good, better than the original. What's the next project?
Forum: Hardware mods 25 August 2018, 00:18
Replies: 53
Views: 5,585
Posted By Stedy
@Hese :bowdown Well done on the mammoth...

@Hese

:bowdown

Well done on the mammoth task of re-tracking the A4000. You have more patience than I would have for a task like this.

For those talking about using the Prometheus design, I...
Forum: Hardware mods 18 August 2018, 01:44
Replies: 25
Views: 1,379
Posted By Stedy
Hi, A straightforward solution is to use a...

Hi,

A straightforward solution is to use a couple of Video chips from Analog Devices. The ADV7842 will accept RGB, YC or Composite video, deinterlace and 3D comb filter and output to a 36 bit...
Forum: Hardware mods 17 August 2018, 01:43
Replies: 51
Views: 3,745
Posted By Stedy
I agree 100%. Nuff said.

I agree 100%.

Nuff said.
Forum: Hardware mods 03 August 2018, 00:45
Replies: 4,059
Views: 360,890
Posted By Stedy
I checked the UCF files/schematic and fitter...

I checked the UCF files/schematic and fitter reports and found something else.

A13 is an unused input and was optimised out by the fitter.
IPL1/2 connect from the 68000 socket to the 68030, not...
Forum: Hardware mods 29 July 2018, 01:37
Replies: 33
Views: 1,924
Posted By Stedy
Hi, I've attached an old design showing a...

Hi,

I've attached an old design showing a simple circuit to interface to the Clockport. Connecting a Rasberry Pi to the clockport, even with level shifters will not work.

When interfacing to...
Forum: support.Hardware 25 July 2018, 22:35
Replies: 6
Views: 441
Posted By Stedy
Hi, How are you connecting the Amiga to the...

Hi,

How are you connecting the Amiga to the OSSC?
You'll need an Amiga SCART cable, with the 330R resistor on CSYNC, otherwise you could be overdriving the SYNC input of the OSSC. If you...
Forum: Hardware mods 10 July 2018, 23:51
Replies: 4,059
Views: 360,890
Posted By Stedy
A lot here, let's start with some simple stuff. ...

A lot here, let's start with some simple stuff.

1) Does the CPLD program correctly and the correct image in the correct part, the bus CPLD is the first in the chain?
2) How do you program the...
Forum: Hardware mods 10 July 2018, 00:52
Replies: 4,059
Views: 360,890
Posted By Stedy
@CRP You've measured the clock signal with the...

@CRP
You've measured the clock signal with the ground connected via the awful 4"-6" ground clip and moved progressively further from the ground point when making measurements. That explains why the...
Forum: support.Hardware 08 July 2018, 01:57
Replies: 84
Views: 9,154
Posted By Stedy
A few comments on the schematic, some may help...

A few comments on the schematic, some may help :nervous

1) Try changing R101 and R102 (DTACK/AVEC) from 10K to 2.2K, this helps the bus goto a safe level quickly when no-one drives the bus.
2)...
Forum: support.Hardware 18 June 2018, 20:02
Replies: 22
Views: 999
Posted By Stedy
Hi, I design high reliability equipment for...

Hi,

I design high reliability equipment for a 30 year life and have spent the last 12 years grasping analogue electronics. Anything that has an electrolytic capacitor fitted has to be tested and...
Forum: Hardware mods 11 June 2018, 23:38
Replies: 34
Views: 2,122
Posted By Stedy
Yep ;) But considerably less educational. ...

Yep ;) But considerably less educational.

You should read my detailed guide on all this:
http://www.ianstedman.co.uk/Amiga/amiga_hacks/Amiga_PSU/amiga_psu.html#ATXPSU

The top end power figure...
Forum: Hardware mods 09 June 2018, 01:30
Replies: 34
Views: 2,122
Posted By Stedy
A 500W PSU will have remote sense on +5V and...

A 500W PSU will have remote sense on +5V and +3.3V. In the original wiring loom there should have been smaller wires in parallel with the normal power wires. Their purpose is to make a Kelvin sense...
Forum: support.Hardware 23 May 2018, 01:27
Replies: 2,873
Views: 268,648
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, 01:04
Replies: 4,059
Views: 360,890
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, 23:35
Replies: 354
Views: 92,324
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, 01:18
Replies: 4,059
Views: 360,890
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, 15:15
Replies: 4,059
Views: 360,890
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, 02:09
Replies: 4,059
Views: 360,890
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, 01:14
Replies: 354
Views: 92,324
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, 01:11
Replies: 2,873
Views: 268,648
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, 23:59
Replies: 2,873
Views: 268,648
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, 01:53
Replies: 2,873
Views: 268,648
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, 14:17
Replies: 2,873
Views: 268,648
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, 02:19
Replies: 2,873
Views: 268,648
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 04 April 2018, 00:45
Replies: 2,873
Views: 268,648
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, 01:24
Replies: 86
Views: 9,619
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, 01:24
Replies: 2,873
Views: 268,648
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, 02:06
Replies: 2,873
Views: 268,648
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, 22:59
Replies: 86
Views: 9,619
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, 02:11
Replies: 6
Views: 380
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, 19:10
Replies: 4,059
Views: 360,890
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, 15:55
Replies: 2,873
Views: 268,648
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...
Showing results 1 to 40 of 623

 
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